./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7 --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 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:15:53,146 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:15:53,148 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:15:53,183 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:15:53,183 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:15:53,184 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:15:53,186 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:15:53,188 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:15:53,190 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:15:53,191 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:15:53,192 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:15:53,193 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:15:53,194 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:15:53,195 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:15:53,197 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:15:53,202 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:15:53,205 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:15:53,208 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:15:53,210 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:15:53,213 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:15:53,218 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:15:53,220 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:15:53,222 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:15:53,223 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:15:53,227 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:15:53,234 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:15:53,234 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:15:53,235 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:15:53,237 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:15:53,238 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:15:53,239 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:15:53,240 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:15:53,242 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:15:53,242 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:15:53,244 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:15:53,244 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:15:53,246 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:15:53,246 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:15:53,246 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:15:53,247 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:15:53,248 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:15:53,248 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:15:53,280 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:15:53,280 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:15:53,281 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:15:53,281 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:15:53,281 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:15:53,282 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:15:53,282 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:15:53,282 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:15:53,282 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:15:53,283 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:15:53,283 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:15:53,283 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:15:53,283 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:15:53,283 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:15:53,284 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:15:53,284 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:15:53,284 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:15:53,284 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:15:53,285 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:15:53,285 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:15:53,286 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:15:53,286 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:15:53,286 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:15:53,286 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:15:53,286 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:15:53,287 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:15:53,287 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:15:53,287 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:15:53,287 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:15:53,287 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:15:53,288 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:15:53,288 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:15:53,288 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:15:53,288 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:15:53,289 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:15:53,289 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:15:53,289 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:15:53,289 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:15:53,290 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:15:53,290 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:15:53,290 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:15:53,290 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_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 [2021-11-25 20:15:53,549 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:15:53,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:15:53,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:15:53,585 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:15:53,586 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:15:53,587 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2021-11-25 20:15:53,651 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/data/2b300133f/2fde90b29c46486086b2f557460084f7/FLAG3f307eb9f [2021-11-25 20:15:54,112 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:15:54,113 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2021-11-25 20:15:54,122 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/data/2b300133f/2fde90b29c46486086b2f557460084f7/FLAG3f307eb9f [2021-11-25 20:15:54,522 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/data/2b300133f/2fde90b29c46486086b2f557460084f7 [2021-11-25 20:15:54,525 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:15:54,526 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:15:54,530 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:15:54,530 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:15:54,534 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:15:54,535 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,536 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23ea6d03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54, skipping insertion in model container [2021-11-25 20:15:54,536 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,545 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:15:54,560 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:15:54,734 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_b720eae1-f970-4db7-ab4c-308da1ee3f65/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2021-11-25 20:15:54,769 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:15:54,775 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:15:54,788 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_b720eae1-f970-4db7-ab4c-308da1ee3f65/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2021-11-25 20:15:54,799 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:15:54,812 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:15:54,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54 WrapperNode [2021-11-25 20:15:54,813 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:15:54,814 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:15:54,814 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:15:54,814 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:15:54,822 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,829 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,851 INFO L137 Inliner]: procedures = 18, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 137 [2021-11-25 20:15:54,851 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:15:54,852 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:15:54,852 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:15:54,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:15:54,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,862 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,863 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,868 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,873 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,875 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,877 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:15:54,878 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:15:54,878 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:15:54,879 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:15:54,879 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (1/1) ... [2021-11-25 20:15:54,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:15:54,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:54,926 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:15:54,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:15:54,971 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:15:54,971 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:15:54,972 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:15:54,972 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:15:54,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:15:54,972 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:15:54,973 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:15:54,973 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 20:15:54,973 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 20:15:54,973 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:15:55,071 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:15:55,072 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:15:55,274 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:15:55,391 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:15:55,397 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-25 20:15:55,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:15:55 BoogieIcfgContainer [2021-11-25 20:15:55,400 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:15:55,402 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:15:55,402 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:15:55,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:15:55,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:15:54" (1/3) ... [2021-11-25 20:15:55,409 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@797cc146 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:15:55, skipping insertion in model container [2021-11-25 20:15:55,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:15:54" (2/3) ... [2021-11-25 20:15:55,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@797cc146 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:15:55, skipping insertion in model container [2021-11-25 20:15:55,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:15:55" (3/3) ... [2021-11-25 20:15:55,411 INFO L111 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-1.i [2021-11-25 20:15:55,419 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:15:55,419 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:15:55,465 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:15:55,472 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 [2021-11-25 20:15:55,472 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:15:55,488 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:15:55,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:15:55,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:55,493 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:55,493 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:55,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:55,499 INFO L85 PathProgramCache]: Analyzing trace with hash 825226196, now seen corresponding path program 1 times [2021-11-25 20:15:55,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:55,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416396199] [2021-11-25 20:15:55,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:55,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:55,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:55,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:55,645 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:55,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416396199] [2021-11-25 20:15:55,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416396199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:15:55,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:15:55,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:15:55,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394719305] [2021-11-25 20:15:55,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:15:55,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:15:55,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:55,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:15:55,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:15:55,683 INFO L87 Difference]: Start difference. First operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:55,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:55,799 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2021-11-25 20:15:55,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:15:55,801 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:15:55,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:55,808 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:15:55,808 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 20:15:55,811 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:15:55,815 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:55,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 26 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:15:55,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 20:15:55,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2021-11-25 20:15:55,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:15:55,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2021-11-25 20:15:55,871 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 8 [2021-11-25 20:15:55,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:55,871 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2021-11-25 20:15:55,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:55,872 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2021-11-25 20:15:55,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:15:55,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:55,872 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:55,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:15:55,873 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:55,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:55,874 INFO L85 PathProgramCache]: Analyzing trace with hash -224566578, now seen corresponding path program 1 times [2021-11-25 20:15:55,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:55,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334763076] [2021-11-25 20:15:55,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:55,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:55,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:55,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:55,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:55,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334763076] [2021-11-25 20:15:55,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334763076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:55,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380692222] [2021-11-25 20:15:55,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:55,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:55,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:55,922 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:55,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:15:55,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:55,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:15:56,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:56,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:56,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:56,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:56,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380692222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:56,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860204340] [2021-11-25 20:15:56,163 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:15:56,164 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:56,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:56,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:56,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:56,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:56,261 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:15:56,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:15:56,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:56,292 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:15:56,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:15:56,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:56,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:15:56,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:56,550 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:15:56,581 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:15:56,581 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 196 treesize of output 195 [2021-11-25 20:15:56,809 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 16 treesize of output 12 [2021-11-25 20:15:56,829 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:56,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [860204340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:15:56,862 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:56,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2021-11-25 20:15:56,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959387509] [2021-11-25 20:15:56,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:15:56,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:15:56,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:56,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:15:56,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:15:56,871 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:56,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:56,942 INFO L93 Difference]: Finished difference Result 43 states and 61 transitions. [2021-11-25 20:15:56,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:15:56,943 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:15:56,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:56,944 INFO L225 Difference]: With dead ends: 43 [2021-11-25 20:15:56,944 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 20:15:56,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:15:56,947 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 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 [2021-11-25 20:15:56,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:15:56,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 20:15:56,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-25 20:15:56,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:15:56,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-25 20:15:56,964 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 9 [2021-11-25 20:15:56,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:56,964 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-25 20:15:56,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:56,965 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-25 20:15:56,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:15:56,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:56,966 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:57,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:57,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:57,184 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:57,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:57,184 INFO L85 PathProgramCache]: Analyzing trace with hash -747487474, now seen corresponding path program 1 times [2021-11-25 20:15:57,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:57,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64997909] [2021-11-25 20:15:57,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:57,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:57,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:57,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:15:57,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:57,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64997909] [2021-11-25 20:15:57,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64997909] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:57,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282251100] [2021-11-25 20:15:57,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:57,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:57,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:57,252 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:57,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:15:57,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:57,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:15:57,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:57,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:57,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:15:57,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282251100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:15:57,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:15:57,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:15:57,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041369519] [2021-11-25 20:15:57,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:15:57,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:15:57,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:57,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:15:57,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:15:57,364 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:57,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:57,408 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-25 20:15:57,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:15:57,409 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 20:15:57,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:57,411 INFO L225 Difference]: With dead ends: 39 [2021-11-25 20:15:57,411 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 20:15:57,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:15:57,420 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:57,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:15:57,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 20:15:57,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-25 20:15:57,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:15:57,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-11-25 20:15:57,431 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 15 [2021-11-25 20:15:57,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:57,432 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-11-25 20:15:57,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:57,433 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-11-25 20:15:57,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 20:15:57,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:57,435 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:57,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:57,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:57,642 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:57,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:57,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1790313624, now seen corresponding path program 1 times [2021-11-25 20:15:57,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:57,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829107887] [2021-11-25 20:15:57,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:57,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:57,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:57,691 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:57,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:57,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829107887] [2021-11-25 20:15:57,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829107887] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:57,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413360036] [2021-11-25 20:15:57,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:57,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:57,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:57,706 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:57,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:15:57,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:57,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:15:57,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:57,824 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:57,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:57,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:57,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413360036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:57,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104532939] [2021-11-25 20:15:57,879 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:15:57,879 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:57,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:57,880 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:57,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:57,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:57,942 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:15:57,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:15:57,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:57,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:15:58,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:58,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:15:58,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:58,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:58,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:58,095 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:15:58,096 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 206 treesize of output 194 [2021-11-25 20:15:58,159 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 16 treesize of output 12 [2021-11-25 20:15:58,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:58,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:15:58,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:15:58,290 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:15:58,290 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 118 treesize of output 119 [2021-11-25 20:15:58,427 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 16 treesize of output 12 [2021-11-25 20:15:58,491 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:15:58,502 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:15:58,503 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 30 [2021-11-25 20:15:58,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:58,733 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-25 20:15:58,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 212 treesize of output 236 [2021-11-25 20:15:59,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:59,324 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-25 20:15:59,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 212 treesize of output 236 [2021-11-25 20:15:59,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2021-11-25 20:15:59,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:00,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) (<= |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| 0) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1|) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| 4)))) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:16:00,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:00,681 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:00,681 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-25 20:16:00,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384902985] [2021-11-25 20:16:00,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:00,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:16:00,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:00,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:16:00,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:16:00,683 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:00,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:00,753 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2021-11-25 20:16:00,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:16:00,754 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 20:16:00,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:00,755 INFO L225 Difference]: With dead ends: 58 [2021-11-25 20:16:00,755 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:16:00,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:16:00,756 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 45 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:00,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 35 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:16:00,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:16:00,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 24. [2021-11-25 20:16:00,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:00,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2021-11-25 20:16:00,763 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 16 [2021-11-25 20:16:00,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:00,764 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2021-11-25 20:16:00,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:00,764 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2021-11-25 20:16:00,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:16:00,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:00,765 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:00,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:00,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:00,978 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:00,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:00,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1836899758, now seen corresponding path program 2 times [2021-11-25 20:16:00,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:00,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729176104] [2021-11-25 20:16:00,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:00,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:01,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:01,102 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:01,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:01,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729176104] [2021-11-25 20:16:01,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729176104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:01,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946295935] [2021-11-25 20:16:01,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:01,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:01,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:01,110 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:01,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:16:01,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:16:01,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:01,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:16:01,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:01,209 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:16:01,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:01,252 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:16:01,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946295935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:01,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998054028] [2021-11-25 20:16:01,258 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:16:01,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:01,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:01,258 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:01,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:01,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,292 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:01,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:01,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:01,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:01,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,363 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:01,383 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:01,384 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 196 treesize of output 195 [2021-11-25 20:16:01,454 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 16 treesize of output 12 [2021-11-25 20:16:01,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:01,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:01,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:16:01,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2021-11-25 20:16:01,597 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 16 treesize of output 12 [2021-11-25 20:16:01,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:01,655 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:01,655 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 30 [2021-11-25 20:16:01,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:01,844 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-25 20:16:01,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 212 treesize of output 236 [2021-11-25 20:16:02,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:02,518 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-25 20:16:02,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 212 treesize of output 236 [2021-11-25 20:16:02,670 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:03,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [998054028] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:16:03,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:03,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 4, 4] total 17 [2021-11-25 20:16:03,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544540078] [2021-11-25 20:16:03,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:16:03,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:16:03,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:03,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:16:03,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2021-11-25 20:16:03,492 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:03,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:03,818 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-11-25 20:16:03,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:16:03,819 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 20:16:03,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:03,819 INFO L225 Difference]: With dead ends: 44 [2021-11-25 20:16:03,820 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:16:03,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=124, Invalid=218, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:16:03,821 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:03,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 37 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:16:03,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:16:03,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-25 20:16:03,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:03,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-25 20:16:03,828 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2021-11-25 20:16:03,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:03,829 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-25 20:16:03,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:03,829 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-25 20:16:03,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:16:03,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:03,830 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:03,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:04,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:04,038 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:04,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:04,038 INFO L85 PathProgramCache]: Analyzing trace with hash 930745131, now seen corresponding path program 1 times [2021-11-25 20:16:04,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:04,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625345715] [2021-11-25 20:16:04,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:04,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:04,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:04,173 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:16:04,174 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:04,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625345715] [2021-11-25 20:16:04,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625345715] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:04,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545558852] [2021-11-25 20:16:04,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:04,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:04,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:04,176 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:04,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:16:04,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:04,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:16:04,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:04,302 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:16:04,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:04,376 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:16:04,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545558852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:04,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949292147] [2021-11-25 20:16:04,381 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:04,381 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:04,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:04,382 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:04,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:04,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,422 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:04,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:04,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:04,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:16:04,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,529 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:16:04,530 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 206 treesize of output 194 [2021-11-25 20:16:04,571 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 16 treesize of output 12 [2021-11-25 20:16:04,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:04,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:04,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:16:04,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:04,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2021-11-25 20:16:04,687 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 16 treesize of output 12 [2021-11-25 20:16:04,845 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:16:04,869 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:04,879 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:04,879 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 30 [2021-11-25 20:16:05,145 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:05,146 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 [2021-11-25 20:16:05,500 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:05,501 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 39 treesize of output 78 [2021-11-25 20:16:05,555 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:05,556 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 [2021-11-25 20:16:05,964 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:05,965 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 39 treesize of output 78 [2021-11-25 20:16:06,033 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:06,034 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 [2021-11-25 20:16:06,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-25 20:16:06,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:07,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1095#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 4))) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:07,005 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:07,005 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:07,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 20:16:07,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769255260] [2021-11-25 20:16:07,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:07,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 20:16:07,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:07,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 20:16:07,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=432, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:16:07,007 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:07,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:07,123 INFO L93 Difference]: Finished difference Result 96 states and 135 transitions. [2021-11-25 20:16:07,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:16:07,124 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 20:16:07,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:07,130 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:16:07,130 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 20:16:07,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=218, Invalid=432, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:16:07,132 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 91 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:07,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 48 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:16:07,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 20:16:07,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 34. [2021-11-25 20:16:07,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:07,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-25 20:16:07,157 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2021-11-25 20:16:07,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:07,158 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-25 20:16:07,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:07,158 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-25 20:16:07,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:16:07,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:07,160 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:07,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:07,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:16:07,385 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:07,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:07,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1129077397, now seen corresponding path program 2 times [2021-11-25 20:16:07,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:07,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959713250] [2021-11-25 20:16:07,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:07,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:07,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:07,549 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:16:07,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:07,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959713250] [2021-11-25 20:16:07,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959713250] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:07,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301221157] [2021-11-25 20:16:07,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:07,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:07,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:07,560 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:07,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:16:07,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:16:07,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:07,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:16:07,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:07,695 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 20:16:07,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 20:16:07,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301221157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:07,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068554733] [2021-11-25 20:16:07,768 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:07,768 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:07,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:07,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:07,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:07,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:07,791 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:16:07,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:16:07,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:07,812 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:07,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:07,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:07,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:07,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:07,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:07,904 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:07,904 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 196 treesize of output 195 [2021-11-25 20:16:07,958 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 16 treesize of output 12 [2021-11-25 20:16:07,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:07,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:07,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:16:08,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:08,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2021-11-25 20:16:08,062 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 16 treesize of output 12 [2021-11-25 20:16:08,237 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:08,247 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:08,247 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 30 [2021-11-25 20:16:08,277 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:16:08,492 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:08,492 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 [2021-11-25 20:16:08,748 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:08,748 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 28 treesize of output 27 [2021-11-25 20:16:08,854 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:08,854 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 39 treesize of output 78 [2021-11-25 20:16:09,209 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:09,209 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 169 treesize of output 208 [2021-11-25 20:16:09,494 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-25 20:16:09,525 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:10,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1520#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) 4))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:10,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:10,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:10,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 4, 4] total 17 [2021-11-25 20:16:10,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587577924] [2021-11-25 20:16:10,263 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:10,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:16:10,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:10,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:16:10,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:16:10,265 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:10,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:10,470 INFO L93 Difference]: Finished difference Result 120 states and 167 transitions. [2021-11-25 20:16:10,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:16:10,471 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 20:16:10,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:10,472 INFO L225 Difference]: With dead ends: 120 [2021-11-25 20:16:10,472 INFO L226 Difference]: Without dead ends: 98 [2021-11-25 20:16:10,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=300, Invalid=822, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:16:10,474 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 115 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:10,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 97 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:16:10,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-25 20:16:10,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 52. [2021-11-25 20:16:10,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 49 states have internal predecessors, (63), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:10,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2021-11-25 20:16:10,490 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 29 [2021-11-25 20:16:10,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:10,491 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2021-11-25 20:16:10,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:10,491 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2021-11-25 20:16:10,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:16:10,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:10,493 INFO L514 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:10,522 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 20:16:10,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:10,706 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:10,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:10,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1213378809, now seen corresponding path program 3 times [2021-11-25 20:16:10,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:10,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689274503] [2021-11-25 20:16:10,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:10,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:10,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:10,882 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:10,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:10,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689274503] [2021-11-25 20:16:10,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689274503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:10,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077318427] [2021-11-25 20:16:10,883 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:16:10,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:10,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:10,884 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:10,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:16:11,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:16:11,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:11,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:16:11,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:11,065 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:11,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:11,325 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:11,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077318427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:11,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796131685] [2021-11-25 20:16:11,328 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:11,328 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:11,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:11,329 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:11,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:11,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:11,355 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:16:11,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:16:11,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:11,377 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:11,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:11,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:11,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:11,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:11,440 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:11,457 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:11,458 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 196 treesize of output 195 [2021-11-25 20:16:11,557 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 16 treesize of output 12 [2021-11-25 20:16:11,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:11,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:11,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:16:11,628 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:16:11,629 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 118 treesize of output 119 [2021-11-25 20:16:11,714 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 16 treesize of output 12 [2021-11-25 20:16:11,859 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:11,860 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:11,884 INFO L354 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2021-11-25 20:16:11,885 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 168 treesize of output 149 [2021-11-25 20:16:12,266 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:12,267 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 [2021-11-25 20:16:12,478 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:12,479 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 [2021-11-25 20:16:12,583 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:12,583 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 [2021-11-25 20:16:12,705 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-25 20:16:12,746 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:13,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2102#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_1| Int)) (and (< 0 |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_1|) (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_4|) (<= |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_1| 2147483646) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) 4) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) 0))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_4|) (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_4|) (+ (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_4| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) (* |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_1| 4))))) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:13,852 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:13,852 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:13,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2021-11-25 20:16:13,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929638378] [2021-11-25 20:16:13,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:13,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:16:13,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:13,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:16:13,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=938, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:16:13,855 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:14,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:14,114 INFO L93 Difference]: Finished difference Result 200 states and 286 transitions. [2021-11-25 20:16:14,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:16:14,115 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-25 20:16:14,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:14,116 INFO L225 Difference]: With dead ends: 200 [2021-11-25 20:16:14,117 INFO L226 Difference]: Without dead ends: 161 [2021-11-25 20:16:14,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=622, Invalid=938, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:16:14,119 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 170 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:14,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 76 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:16:14,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-25 20:16:14,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 65. [2021-11-25 20:16:14,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 62 states have internal predecessors, (76), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:14,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-25 20:16:14,139 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 39 [2021-11-25 20:16:14,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:14,140 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-25 20:16:14,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:14,140 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-25 20:16:14,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:16:14,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:14,142 INFO L514 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:14,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:14,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:16:14,358 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:14,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:14,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1198289843, now seen corresponding path program 4 times [2021-11-25 20:16:14,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:14,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620410076] [2021-11-25 20:16:14,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:14,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:14,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:14,702 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:14,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:14,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620410076] [2021-11-25 20:16:14,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620410076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:14,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615389776] [2021-11-25 20:16:14,702 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:16:14,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:14,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:14,710 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:14,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:16:14,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:14,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:16:14,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:14,923 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:14,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:15,645 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:15,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615389776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:15,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564514558] [2021-11-25 20:16:15,647 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:15,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:15,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:15,648 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:15,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:15,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:15,676 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:15,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:15,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:15,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:15,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:15,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:15,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:15,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:15,779 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:15,779 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 196 treesize of output 195 [2021-11-25 20:16:15,874 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 16 treesize of output 12 [2021-11-25 20:16:15,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:15,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:15,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:16:15,955 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:16:15,955 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 118 treesize of output 119 [2021-11-25 20:16:16,026 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 16 treesize of output 12 [2021-11-25 20:16:16,165 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:16,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:16,191 INFO L354 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2021-11-25 20:16:16,192 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 168 treesize of output 149 [2021-11-25 20:16:16,624 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:16,624 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 [2021-11-25 20:16:16,897 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:16,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-25 20:16:17,552 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:16:17,552 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 169 treesize of output 208 [2021-11-25 20:16:17,803 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-25 20:16:17,814 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:18,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2951#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 0))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:18,550 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:18,550 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:18,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-25 20:16:18,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227170065] [2021-11-25 20:16:18,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:18,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:16:18,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:18,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:16:18,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1878, Invalid=2412, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:16:18,555 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:19,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:19,157 INFO L93 Difference]: Finished difference Result 330 states and 481 transitions. [2021-11-25 20:16:19,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 20:16:19,157 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-25 20:16:19,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:19,163 INFO L225 Difference]: With dead ends: 330 [2021-11-25 20:16:19,163 INFO L226 Difference]: Without dead ends: 291 [2021-11-25 20:16:19,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1342 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1878, Invalid=2412, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:16:19,171 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 529 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:19,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 88 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:16:19,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-25 20:16:19,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 91. [2021-11-25 20:16:19,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 88 states have (on average 1.1590909090909092) internal successors, (102), 88 states have internal predecessors, (102), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:19,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2021-11-25 20:16:19,213 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 52 [2021-11-25 20:16:19,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:19,215 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2021-11-25 20:16:19,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:19,215 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2021-11-25 20:16:19,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 20:16:19,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:19,218 INFO L514 BasicCegarLoop]: trace histogram [50, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:19,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:19,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:19,418 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:19,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:19,419 INFO L85 PathProgramCache]: Analyzing trace with hash -2085870963, now seen corresponding path program 5 times [2021-11-25 20:16:19,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:19,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133734028] [2021-11-25 20:16:19,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:19,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:19,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:16:20,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:20,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133734028] [2021-11-25 20:16:20,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133734028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:20,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711205249] [2021-11-25 20:16:20,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:20,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:20,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:20,691 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:20,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:16:20,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:16:20,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:20,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:16:20,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:21,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1297 trivial. 0 not checked. [2021-11-25 20:16:21,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:21,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1297 trivial. 0 not checked. [2021-11-25 20:16:21,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711205249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:21,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583703912] [2021-11-25 20:16:21,326 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:21,327 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:21,327 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:21,327 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:21,327 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:21,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:21,362 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:21,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:21,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:21,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:21,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:21,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:21,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:21,433 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:21,454 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:21,455 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 196 treesize of output 195 [2021-11-25 20:16:21,541 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 16 treesize of output 12 [2021-11-25 20:16:21,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:21,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:21,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:16:21,611 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:16:21,612 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 118 treesize of output 119 [2021-11-25 20:16:21,674 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 16 treesize of output 12 [2021-11-25 20:16:21,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:21,821 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:21,822 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 30 [2021-11-25 20:16:21,859 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:16:22,079 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:22,079 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 [2021-11-25 20:16:22,268 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:22,269 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 [2021-11-25 20:16:22,368 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:22,368 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 [2021-11-25 20:16:22,484 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2021-11-25 20:16:22,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:23,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4252#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_2| Int)) (and (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_6|) (+ (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_6| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_2|) (+ (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_6| 4) (- 4)))) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_2|) 4))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_6|) (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_6|) (<= |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_6| 2147483647) (< 1 |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_6|) (<= 0 |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_2|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:23,976 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:23,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:23,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 7, 7] total 63 [2021-11-25 20:16:23,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692610530] [2021-11-25 20:16:23,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:23,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 20:16:23,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:23,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 20:16:23,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1948, Invalid=3752, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:16:23,980 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:24,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:24,983 INFO L93 Difference]: Finished difference Result 385 states and 543 transitions. [2021-11-25 20:16:24,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 20:16:24,983 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-25 20:16:24,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:24,986 INFO L225 Difference]: With dead ends: 385 [2021-11-25 20:16:24,986 INFO L226 Difference]: Without dead ends: 346 [2021-11-25 20:16:24,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2578, Invalid=4732, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 20:16:24,989 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 958 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 542 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1009 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 542 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:24,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1009 Valid, 338 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [542 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:16:24,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-25 20:16:25,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 140. [2021-11-25 20:16:25,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 137 states have (on average 1.2335766423357664) internal successors, (169), 137 states have internal predecessors, (169), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:25,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 171 transitions. [2021-11-25 20:16:25,019 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 171 transitions. Word has length 78 [2021-11-25 20:16:25,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:25,019 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 171 transitions. [2021-11-25 20:16:25,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:25,020 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 171 transitions. [2021-11-25 20:16:25,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:16:25,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:25,022 INFO L514 BasicCegarLoop]: trace histogram [51, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:25,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:25,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:16:25,238 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:25,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:25,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1807186329, now seen corresponding path program 6 times [2021-11-25 20:16:25,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:25,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454581531] [2021-11-25 20:16:25,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:25,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:26,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:26,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:26,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454581531] [2021-11-25 20:16:26,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454581531] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:26,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333070591] [2021-11-25 20:16:26,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:16:26,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:26,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:26,409 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:26,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:16:26,687 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:16:26,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:26,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 20:16:26,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:26,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:26,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:29,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:29,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333070591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:29,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70109605] [2021-11-25 20:16:29,770 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:29,771 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:29,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:29,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:29,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:29,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:29,797 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:29,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:29,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:29,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:29,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:29,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:29,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:29,875 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:29,893 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:29,893 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 196 treesize of output 195 [2021-11-25 20:16:29,964 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 16 treesize of output 12 [2021-11-25 20:16:29,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:29,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:29,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:16:30,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:30,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2021-11-25 20:16:30,079 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 16 treesize of output 12 [2021-11-25 20:16:30,214 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:16:30,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:30,245 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:30,245 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 30 [2021-11-25 20:16:30,445 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:30,445 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 [2021-11-25 20:16:30,641 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:30,641 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 [2021-11-25 20:16:30,722 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:30,723 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 [2021-11-25 20:16:30,814 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2021-11-25 20:16:30,864 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:32,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5962#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_insert_#in~set#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_7| Int)) (and (<= |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_7| 2147483647) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_#in~set#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_insert_#in~set#1.base_BEFORE_CALL_3|) 4))) 1 0)) (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_7|) (<= 0 |v_ULTIMATE.start_insert_#in~set#1.base_BEFORE_CALL_3|) (= (select (select |#memory_int| |v_ULTIMATE.start_insert_#in~set#1.base_BEFORE_CALL_3|) (+ (- 4) (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_7| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_7|) (+ (- 4) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_7| 4)))) (< 1 |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_7|) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_7|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:32,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:32,166 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:32,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 106 [2021-11-25 20:16:32,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267895833] [2021-11-25 20:16:32,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:32,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-25 20:16:32,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:32,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-25 20:16:32,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6662, Invalid=7618, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 20:16:32,174 INFO L87 Difference]: Start difference. First operand 140 states and 171 transitions. Second operand has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:34,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:34,687 INFO L93 Difference]: Finished difference Result 696 states and 1018 transitions. [2021-11-25 20:16:34,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-25 20:16:34,688 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-25 20:16:34,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:34,697 INFO L225 Difference]: With dead ends: 696 [2021-11-25 20:16:34,697 INFO L226 Difference]: Without dead ends: 609 [2021-11-25 20:16:34,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6662, Invalid=7618, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 20:16:34,704 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 970 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 1003 mSolverCounterSat, 698 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1074 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 1701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 698 IncrementalHoareTripleChecker+Valid, 1003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:34,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1074 Valid, 163 Invalid, 1701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [698 Valid, 1003 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:16:34,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-11-25 20:16:34,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 193. [2021-11-25 20:16:34,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 190 states have (on average 1.168421052631579) internal successors, (222), 190 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:16:34,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 224 transitions. [2021-11-25 20:16:34,772 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 224 transitions. Word has length 103 [2021-11-25 20:16:34,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:34,773 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 224 transitions. [2021-11-25 20:16:34,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:34,774 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 224 transitions. [2021-11-25 20:16:34,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 20:16:34,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:34,780 INFO L514 BasicCegarLoop]: trace histogram [104, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:34,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:34,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:16:34,994 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:34,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:34,994 INFO L85 PathProgramCache]: Analyzing trace with hash -243063635, now seen corresponding path program 7 times [2021-11-25 20:16:34,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:34,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714310873] [2021-11-25 20:16:34,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:34,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:35,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:39,069 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:39,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:39,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714310873] [2021-11-25 20:16:39,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714310873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:39,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199445432] [2021-11-25 20:16:39,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:16:39,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:39,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:39,072 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:39,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:16:39,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:39,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 1428 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-25 20:16:39,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:39,619 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:39,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:50,405 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:16:50,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199445432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:50,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [101915178] [2021-11-25 20:16:50,407 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:16:50,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:50,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:50,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:50,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:50,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:50,441 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:16:50,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:16:50,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:50,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:16:50,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:50,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:16:50,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:50,512 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:50,530 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:16:50,531 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 196 treesize of output 195 [2021-11-25 20:16:50,603 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 16 treesize of output 12 [2021-11-25 20:16:50,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:50,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:16:50,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:16:50,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:16:50,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2021-11-25 20:16:50,716 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 16 treesize of output 12 [2021-11-25 20:16:50,820 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:16:50,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:16:50,881 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:16:50,882 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 30 [2021-11-25 20:16:51,079 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:51,079 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 [2021-11-25 20:16:51,260 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:51,260 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 [2021-11-25 20:16:51,353 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:16:51,354 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 [2021-11-25 20:16:51,484 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-25 20:16:51,519 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:52,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8745#(and (exists ((|v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_4| Int)) (and (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_4|) (* |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_4| 4)) (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_8|) (+ (- 4) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_8| 4)))) (< 0 |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_4|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_4|) 4) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_4|) 0))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_8|) (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_8|) (<= 0 |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_4|) (<= |v_ULTIMATE.start_insert_#in~size#1_BEFORE_CALL_4| 2147483646))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:52,914 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:52,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:52,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2021-11-25 20:16:52,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821045063] [2021-11-25 20:16:52,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:52,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-25 20:16:52,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:52,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-25 20:16:52,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24523, Invalid=26327, Unknown=0, NotChecked=0, Total=50850 [2021-11-25 20:16:52,925 INFO L87 Difference]: Start difference. First operand 193 states and 224 transitions. Second operand has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:11,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:11,299 INFO L93 Difference]: Finished difference Result 1226 states and 1813 transitions. [2021-11-25 20:17:11,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-25 20:17:11,300 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-25 20:17:11,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:11,309 INFO L225 Difference]: With dead ends: 1226 [2021-11-25 20:17:11,309 INFO L226 Difference]: Without dead ends: 1139 [2021-11-25 20:17:11,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 348 SyntacticMatches, 0 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5488 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=24523, Invalid=26327, Unknown=0, NotChecked=0, Total=50850 [2021-11-25 20:17:11,316 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 2349 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 2229 mSolverCounterSat, 1839 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2559 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 4068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1839 IncrementalHoareTripleChecker+Valid, 2229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:11,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2559 Valid, 241 Invalid, 4068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1839 Valid, 2229 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 20:17:11,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1139 states. [2021-11-25 20:17:11,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1139 to 299. [2021-11-25 20:17:11,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 296 states have (on average 1.1081081081081081) internal successors, (328), 296 states have internal predecessors, (328), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:17:11,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 330 transitions. [2021-11-25 20:17:11,438 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 330 transitions. Word has length 156 [2021-11-25 20:17:11,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:11,439 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 330 transitions. [2021-11-25 20:17:11,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:11,439 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 330 transitions. [2021-11-25 20:17:11,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-25 20:17:11,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:11,444 INFO L514 BasicCegarLoop]: trace histogram [210, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:11,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:11,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:17:11,658 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:11,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:11,659 INFO L85 PathProgramCache]: Analyzing trace with hash -351003411, now seen corresponding path program 8 times [2021-11-25 20:17:11,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:11,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650292920] [2021-11-25 20:17:11,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:11,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:12,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:26,869 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:17:26,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:26,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650292920] [2021-11-25 20:17:26,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650292920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:26,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000471176] [2021-11-25 20:17:26,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:26,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:26,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:26,871 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:26,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:17:27,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:17:27,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:27,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:17:27,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:29,003 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 22300 trivial. 0 not checked. [2021-11-25 20:17:29,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:30,132 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 22300 trivial. 0 not checked. [2021-11-25 20:17:30,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000471176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:30,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [733548320] [2021-11-25 20:17:30,134 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:17:30,134 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:30,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:30,135 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:30,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:30,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:30,164 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:17:30,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:17:30,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:30,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:17:30,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:30,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:17:30,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:30,211 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:30,228 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:17:30,229 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 196 treesize of output 195 [2021-11-25 20:17:30,279 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 16 treesize of output 12 [2021-11-25 20:17:30,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:17:30,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:17:30,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:17:30,340 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:17:30,340 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 118 treesize of output 119 [2021-11-25 20:17:30,375 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 16 treesize of output 12 [2021-11-25 20:17:30,478 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:17:30,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:30,543 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:17:30,545 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 30 [2021-11-25 20:17:30,697 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:17:30,698 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 [2021-11-25 20:17:30,838 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:17:30,838 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 [2021-11-25 20:17:30,916 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:17:30,916 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 [2021-11-25 20:17:31,012 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2021-11-25 20:17:31,052 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:32,773 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13352#(and (exists ((|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_5|) (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_9|) (+ (- 4) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_9| 4))) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_5|) (+ (- 4) (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_9| 4)))) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_5|) 4))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_9|) (< 1 |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_9|) (<= |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_9| 2147483647) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_9|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:32,773 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:32,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:32,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 13, 13] total 235 [2021-11-25 20:17:32,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444132200] [2021-11-25 20:17:32,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:32,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2021-11-25 20:17:32,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:32,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2021-11-25 20:17:32,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24798, Invalid=36458, Unknown=0, NotChecked=0, Total=61256 [2021-11-25 20:17:32,781 INFO L87 Difference]: Start difference. First operand 299 states and 330 transitions. Second operand has 235 states, 235 states have (on average 1.0765957446808512) internal successors, (253), 235 states have internal predecessors, (253), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:54,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:54,387 INFO L93 Difference]: Finished difference Result 1329 states and 1873 transitions. [2021-11-25 20:17:54,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 235 states. [2021-11-25 20:17:54,388 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0765957446808512) internal successors, (253), 235 states have internal predecessors, (253), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-25 20:17:54,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:54,397 INFO L225 Difference]: With dead ends: 1329 [2021-11-25 20:17:54,397 INFO L226 Difference]: Without dead ends: 1242 [2021-11-25 20:17:54,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 750 SyntacticMatches, 0 SemanticMatches, 268 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10127 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=29968, Invalid=42662, Unknown=0, NotChecked=0, Total=72630 [2021-11-25 20:17:54,403 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 3165 mSDsluCounter, 1149 mSDsCounter, 0 mSdLazyCounter, 2437 mSolverCounterSat, 1997 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3376 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 4434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1997 IncrementalHoareTripleChecker+Valid, 2437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:54,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3376 Valid, 965 Invalid, 4434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1997 Valid, 2437 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 20:17:54,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1242 states. [2021-11-25 20:17:54,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1242 to 396. [2021-11-25 20:17:54,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 393 states have (on average 1.173027989821883) internal successors, (461), 393 states have internal predecessors, (461), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:17:54,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 463 transitions. [2021-11-25 20:17:54,491 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 463 transitions. Word has length 262 [2021-11-25 20:17:54,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:54,492 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 463 transitions. [2021-11-25 20:17:54,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0765957446808512) internal successors, (253), 235 states have internal predecessors, (253), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:54,493 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 463 transitions. [2021-11-25 20:17:54,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2021-11-25 20:17:54,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:54,498 INFO L514 BasicCegarLoop]: trace histogram [211, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:54,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:54,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:54,711 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:54,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:54,712 INFO L85 PathProgramCache]: Analyzing trace with hash -2056598745, now seen corresponding path program 9 times [2021-11-25 20:17:54,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:54,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630151876] [2021-11-25 20:17:54,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:54,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:55,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:10,073 INFO L134 CoverageAnalysis]: Checked inductivity of 23334 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:18:10,073 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:10,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630151876] [2021-11-25 20:18:10,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630151876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:10,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239683768] [2021-11-25 20:18:10,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:18:10,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:10,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:10,098 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:10,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:18:10,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:18:10,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:10,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 2883 conjuncts, 213 conjunts are in the unsatisfiable core [2021-11-25 20:18:10,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:11,275 INFO L134 CoverageAnalysis]: Checked inductivity of 23334 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:18:11,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:54,771 INFO L134 CoverageAnalysis]: Checked inductivity of 23334 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:18:54,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [239683768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:54,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620555253] [2021-11-25 20:18:54,773 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:18:54,773 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:54,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:54,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:54,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:54,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:54,800 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:18:54,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:18:54,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:54,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:18:54,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:54,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:18:54,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:54,855 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:18:54,872 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:18:54,873 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 196 treesize of output 195 [2021-11-25 20:18:54,936 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 16 treesize of output 12 [2021-11-25 20:18:54,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:54,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:18:54,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:18:54,992 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:18:54,993 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 118 treesize of output 119 [2021-11-25 20:18:55,043 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 16 treesize of output 12 [2021-11-25 20:18:55,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:18:55,150 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:18:55,150 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 30 [2021-11-25 20:18:55,174 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:18:55,371 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:18:55,371 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 [2021-11-25 20:18:55,668 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:18:55,668 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 169 treesize of output 208 [2021-11-25 20:18:56,023 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:18:56,023 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 169 treesize of output 208 [2021-11-25 20:18:56,269 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-25 20:18:56,280 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:57,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18864#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 0))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:57,398 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:57,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:57,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [213, 213, 213] total 426 [2021-11-25 20:18:57,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423812412] [2021-11-25 20:18:57,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:57,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 427 states [2021-11-25 20:18:57,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:57,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 427 interpolants. [2021-11-25 20:18:57,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94817, Invalid=98343, Unknown=0, NotChecked=0, Total=193160 [2021-11-25 20:18:57,433 INFO L87 Difference]: Start difference. First operand 396 states and 463 transitions. Second operand has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:49,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:49,061 INFO L93 Difference]: Finished difference Result 2488 states and 3682 transitions. [2021-11-25 20:22:49,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 426 states. [2021-11-25 20:22:49,062 INFO L78 Accepts]: Start accepts. Automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 311 [2021-11-25 20:22:49,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:49,077 INFO L225 Difference]: With dead ends: 2488 [2021-11-25 20:22:49,078 INFO L226 Difference]: Without dead ends: 2305 [2021-11-25 20:22:49,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1144 GetRequests, 706 SyntacticMatches, 0 SemanticMatches, 438 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11066 ImplicationChecksByTransitivity, 58.4s TimeCoverageRelationStatistics Valid=94817, Invalid=98343, Unknown=0, NotChecked=0, Total=193160 [2021-11-25 20:22:49,093 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 5257 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 4996 mSolverCounterSat, 4276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5681 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 9272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4276 IncrementalHoareTripleChecker+Valid, 4996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:49,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5681 Valid, 476 Invalid, 9272 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4276 Valid, 4996 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-25 20:22:49,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2305 states. [2021-11-25 20:22:49,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2305 to 609. [2021-11-25 20:22:49,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 609 states, 606 states have (on average 1.1122112211221122) internal successors, (674), 606 states have internal predecessors, (674), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 20:22:49,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 609 states to 609 states and 676 transitions. [2021-11-25 20:22:49,304 INFO L78 Accepts]: Start accepts. Automaton has 609 states and 676 transitions. Word has length 311 [2021-11-25 20:22:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:49,304 INFO L470 AbstractCegarLoop]: Abstraction has 609 states and 676 transitions. [2021-11-25 20:22:49,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:49,305 INFO L276 IsEmpty]: Start isEmpty. Operand 609 states and 676 transitions. [2021-11-25 20:22:49,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 525 [2021-11-25 20:22:49,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:49,317 INFO L514 BasicCegarLoop]: trace histogram [424, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:49,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:49,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:49,534 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:49,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:49,534 INFO L85 PathProgramCache]: Analyzing trace with hash 346607981, now seen corresponding path program 10 times [2021-11-25 20:22:49,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:49,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198953197] [2021-11-25 20:22:49,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:49,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:51,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:50,159 INFO L134 CoverageAnalysis]: Checked inductivity of 91068 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:23:50,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:50,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198953197] [2021-11-25 20:23:50,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198953197] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:50,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323891573] [2021-11-25 20:23:50,160 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:23:50,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:50,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:50,162 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:50,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b720eae1-f970-4db7-ab4c-308da1ee3f65/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:23:51,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:51,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 4800 conjuncts, 426 conjunts are in the unsatisfiable core [2021-11-25 20:23:51,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:52,147 INFO L134 CoverageAnalysis]: Checked inductivity of 91068 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:23:52,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:26:50,470 INFO L134 CoverageAnalysis]: Checked inductivity of 91068 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-25 20:26:50,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323891573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:26:50,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106793031] [2021-11-25 20:26:50,472 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:26:50,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:26:50,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:26:50,472 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:26:50,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:26:50,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,494 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:26:50,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:26:50,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,512 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:26:50,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:26:50,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 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 [2021-11-25 20:26:50,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:26:50,567 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:26:50,568 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 206 treesize of output 194 [2021-11-25 20:26:50,593 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 16 treesize of output 12 [2021-11-25 20:26:50,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:26:50,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:26:50,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:26:50,650 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:26:50,650 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 118 treesize of output 119 [2021-11-25 20:26:50,701 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 16 treesize of output 12 [2021-11-25 20:26:50,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:26:50,831 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-25 20:26:50,832 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 30 [2021-11-25 20:26:50,856 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:26:50,999 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:26:50,999 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 [2021-11-25 20:26:51,220 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-25 20:26:51,220 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 [2021-11-25 20:26:51,307 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:26:51,308 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 39 treesize of output 78 [2021-11-25 20:26:51,636 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-25 20:26:51,637 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 169 treesize of output 208 [2021-11-25 20:26:51,918 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-25 20:26:51,929 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:26:53,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28555#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 4))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:26:53,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:26:53,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:26:53,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [426, 426, 426] total 852 [2021-11-25 20:26:53,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445265085] [2021-11-25 20:26:53,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:26:53,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 853 states [2021-11-25 20:26:53,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:26:53,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 853 interpolants. [2021-11-25 20:26:53,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371078, Invalid=378012, Unknown=0, NotChecked=0, Total=749090 [2021-11-25 20:26:53,527 INFO L87 Difference]: Start difference. First operand 609 states and 676 transitions. Second operand has 853 states, 853 states have (on average 1.0175849941383353) internal successors, (868), 852 states have internal predecessors, (868), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)