./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 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/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_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:18:47,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:18:47,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:18:47,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:18:47,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:18:47,319 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:18:47,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:18:47,327 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:18:47,331 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:18:47,338 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:18:47,340 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:18:47,342 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:18:47,343 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:18:47,346 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:18:47,348 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:18:47,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:18:47,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:18:47,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:18:47,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:18:47,358 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:18:47,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:18:47,363 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:18:47,364 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:18:47,366 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:18:47,370 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:18:47,371 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:18:47,371 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:18:47,373 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:18:47,373 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:18:47,375 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:18:47,375 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:18:47,377 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:18:47,378 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:18:47,379 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:18:47,381 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:18:47,381 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:18:47,382 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:18:47,382 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:18:47,382 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:18:47,384 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:18:47,385 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:18:47,386 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:18:47,444 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:18:47,445 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:18:47,446 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:18:47,446 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:18:47,447 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:18:47,447 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:18:47,448 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:18:47,448 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:18:47,448 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:18:47,448 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:18:47,450 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:18:47,450 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:18:47,450 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:18:47,451 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:18:47,451 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:18:47,451 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:18:47,451 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:18:47,452 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:18:47,453 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:18:47,454 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:18:47,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:18:47,454 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:18:47,454 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:18:47,455 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:18:47,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:18:47,455 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:18:47,457 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:18:47,457 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:18:47,458 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:18:47,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:18:47,458 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:18:47,459 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:18:47,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:18:47,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:18:47,459 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:18:47,460 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:18:47,460 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:18:47,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:18:47,460 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:18:47,460 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:18:47,461 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:18:47,461 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_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 [2021-11-21 00:18:47,882 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:18:47,914 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:18:47,919 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:18:47,921 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:18:47,922 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:18:47,924 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2021-11-21 00:18:48,016 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/data/1d1072874/a475e9c818614704a40c2e81747c3186/FLAGa5c51b091 [2021-11-21 00:18:48,680 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:18:48,681 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2021-11-21 00:18:48,689 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/data/1d1072874/a475e9c818614704a40c2e81747c3186/FLAGa5c51b091 [2021-11-21 00:18:49,025 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/data/1d1072874/a475e9c818614704a40c2e81747c3186 [2021-11-21 00:18:49,030 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:18:49,032 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:18:49,038 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:18:49,039 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:18:49,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:18:49,052 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,054 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6090e173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49, skipping insertion in model container [2021-11-21 00:18:49,055 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:18:49,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:18:49,260 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_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2021-11-21 00:18:49,289 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:18:49,299 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:18:49,316 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_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2021-11-21 00:18:49,330 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:18:49,344 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:18:49,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49 WrapperNode [2021-11-21 00:18:49,345 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:18:49,346 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:18:49,346 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:18:49,346 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:18:49,355 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,378 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,402 INFO L137 Inliner]: procedures = 18, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 137 [2021-11-21 00:18:49,403 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:18:49,404 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:18:49,404 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:18:49,404 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:18:49,412 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,415 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,424 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,430 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,432 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,435 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:18:49,436 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:18:49,436 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:18:49,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:18:49,437 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (1/1) ... [2021-11-21 00:18:49,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:18:49,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:49,474 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:18:49,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:18:49,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:18:49,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:18:49,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:18:49,546 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:18:49,546 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:18:49,546 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:18:49,546 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:18:49,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:18:49,547 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:18:49,547 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:18:49,664 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:18:49,666 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:18:49,925 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:18:50,047 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:18:50,048 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-21 00:18:50,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:18:50 BoogieIcfgContainer [2021-11-21 00:18:50,051 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:18:50,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:18:50,053 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:18:50,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:18:50,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:18:49" (1/3) ... [2021-11-21 00:18:50,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@603fe98f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:18:50, skipping insertion in model container [2021-11-21 00:18:50,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:49" (2/3) ... [2021-11-21 00:18:50,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@603fe98f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:18:50, skipping insertion in model container [2021-11-21 00:18:50,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:18:50" (3/3) ... [2021-11-21 00:18:50,061 INFO L111 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-1.i [2021-11-21 00:18:50,067 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:18:50,068 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:18:50,127 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:18:50,136 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:18:50,136 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:18:50,184 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) [2021-11-21 00:18:50,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:18:50,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:50,191 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:50,192 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:50,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:50,199 INFO L85 PathProgramCache]: Analyzing trace with hash 825226196, now seen corresponding path program 1 times [2021-11-21 00:18:50,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:50,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161636086] [2021-11-21 00:18:50,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:50,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:50,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:50,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:50,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:50,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161636086] [2021-11-21 00:18:50,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161636086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:50,448 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:18:50,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:18:50,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107392912] [2021-11-21 00:18:50,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:50,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:18:50,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:50,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:18:50,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:18:50,502 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) [2021-11-21 00:18:50,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:50,678 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2021-11-21 00:18:50,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:18:50,681 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 [2021-11-21 00:18:50,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:50,698 INFO L225 Difference]: With dead ends: 57 [2021-11-21 00:18:50,698 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 00:18:50,703 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 [2021-11-21 00:18:50,710 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 [2021-11-21 00:18:50,712 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] [2021-11-21 00:18:50,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 00:18:50,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2021-11-21 00:18:50,775 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) [2021-11-21 00:18:50,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2021-11-21 00:18:50,778 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 8 [2021-11-21 00:18:50,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:50,778 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2021-11-21 00:18:50,779 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) [2021-11-21 00:18:50,779 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2021-11-21 00:18:50,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:18:50,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:50,780 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:50,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:18:50,781 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:50,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:50,782 INFO L85 PathProgramCache]: Analyzing trace with hash -224566578, now seen corresponding path program 1 times [2021-11-21 00:18:50,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:50,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545938232] [2021-11-21 00:18:50,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:50,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:50,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:50,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:50,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:50,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545938232] [2021-11-21 00:18:50,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545938232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:50,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209086372] [2021-11-21 00:18:50,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:50,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:50,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:50,859 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:50,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:18:50,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:50,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:18:50,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:51,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:51,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:51,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:51,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209086372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:51,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184404289] [2021-11-21 00:18:51,135 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:18:51,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:51,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:51,148 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:51,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:51,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:51,263 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:18:51,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 00:18:51,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:51,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:51,329 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:18:51,330 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 [2021-11-21 00:18:51,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:51,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:18:51,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:51,780 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:51,811 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:18:51,812 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 192 treesize of output 191 [2021-11-21 00:18:52,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:18:52,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:52,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1184404289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:52,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:52,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2021-11-21 00:18:52,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922017091] [2021-11-21 00:18:52,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:52,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:18:52,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:52,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:18:52,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:18:52,487 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) [2021-11-21 00:18:52,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:52,585 INFO L93 Difference]: Finished difference Result 43 states and 61 transitions. [2021-11-21 00:18:52,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:18:52,589 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 [2021-11-21 00:18:52,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:52,591 INFO L225 Difference]: With dead ends: 43 [2021-11-21 00:18:52,591 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:18:52,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:18:52,594 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:52,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:52,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:18:52,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-21 00:18:52,607 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) [2021-11-21 00:18:52,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-21 00:18:52,610 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 9 [2021-11-21 00:18:52,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:52,611 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-21 00:18:52,611 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) [2021-11-21 00:18:52,612 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-21 00:18:52,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:18:52,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:52,613 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:52,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:52,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:52,841 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:52,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:52,842 INFO L85 PathProgramCache]: Analyzing trace with hash -747487474, now seen corresponding path program 1 times [2021-11-21 00:18:52,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:52,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128561348] [2021-11-21 00:18:52,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:52,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:52,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:52,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:18:52,889 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:52,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128561348] [2021-11-21 00:18:52,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128561348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:52,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869136002] [2021-11-21 00:18:52,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:52,890 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:52,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:52,892 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:52,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:18:52,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:52,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:18:52,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:53,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:18:53,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:53,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869136002] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:53,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:53,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 00:18:53,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765577972] [2021-11-21 00:18:53,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:53,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:18:53,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:53,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:18:53,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:18:53,073 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) [2021-11-21 00:18:53,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:53,121 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-21 00:18:53,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:18:53,122 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 [2021-11-21 00:18:53,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:53,123 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:18:53,123 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 00:18:53,124 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 [2021-11-21 00:18:53,126 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 [2021-11-21 00:18:53,127 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] [2021-11-21 00:18:53,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 00:18:53,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-21 00:18:53,133 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) [2021-11-21 00:18:53,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-11-21 00:18:53,134 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 15 [2021-11-21 00:18:53,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:53,135 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-11-21 00:18:53,135 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) [2021-11-21 00:18:53,136 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-11-21 00:18:53,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:18:53,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:53,137 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:53,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:53,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:53,354 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:53,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:53,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1790313624, now seen corresponding path program 1 times [2021-11-21 00:18:53,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:53,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120016513] [2021-11-21 00:18:53,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:53,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:53,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:53,396 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:18:53,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:53,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120016513] [2021-11-21 00:18:53,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120016513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:53,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211297879] [2021-11-21 00:18:53,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:53,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:53,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:53,399 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:53,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:18:53,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:53,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:18:53,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:53,544 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:18:53,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:53,604 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:18:53,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211297879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:53,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034952947] [2021-11-21 00:18:53,620 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 00:18:53,625 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:53,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:53,626 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:53,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:53,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,674 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:18:53,674 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 [2021-11-21 00:18:53,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,699 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 [2021-11-21 00:18:53,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:18:53,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,970 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:18:53,971 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 202 treesize of output 190 [2021-11-21 00:18:54,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:18:54,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:18:54,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:18:54,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:18:54,589 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:18:54,590 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 88 treesize of output 89 [2021-11-21 00:18:54,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:18:55,403 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:55,419 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:18:55,420 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 [2021-11-21 00:18:56,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:56,332 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:18:56,333 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 30 treesize of output 25 [2021-11-21 00:18:57,065 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:57,080 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:18:57,081 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 [2021-11-21 00:18:57,296 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:58,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2034952947] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:58,501 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:58,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2021-11-21 00:18:58,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974396207] [2021-11-21 00:18:58,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:58,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:18:58,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:58,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:18:58,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=90, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:18:58,503 INFO L87 Difference]: Start difference. First operand 21 states and 27 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) [2021-11-21 00:18:59,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:59,162 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2021-11-21 00:18:59,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:18:59,162 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 16 [2021-11-21 00:18:59,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:59,163 INFO L225 Difference]: With dead ends: 41 [2021-11-21 00:18:59,163 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 00:18:59,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=92, Invalid=118, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:18:59,166 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:59,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 37 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:18:59,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 00:18:59,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-11-21 00:18:59,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 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) [2021-11-21 00:18:59,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-11-21 00:18:59,176 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 16 [2021-11-21 00:18:59,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:59,176 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-11-21 00:18:59,176 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) [2021-11-21 00:18:59,177 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-11-21 00:18:59,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:18:59,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:59,178 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:59,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 00:18:59,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:59,397 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:59,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:59,398 INFO L85 PathProgramCache]: Analyzing trace with hash 457595505, now seen corresponding path program 1 times [2021-11-21 00:18:59,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:59,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3889991] [2021-11-21 00:18:59,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:59,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:59,443 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:18:59,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:59,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3889991] [2021-11-21 00:18:59,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3889991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:59,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673308626] [2021-11-21 00:18:59,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:59,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:59,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:59,461 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:59,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:18:59,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:59,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:18:59,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:59,569 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:18:59,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:59,619 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:18:59,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673308626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:59,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [959943647] [2021-11-21 00:18:59,627 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:59,627 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:59,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:59,629 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:59,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:59,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,689 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:18:59,690 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 [2021-11-21 00:18:59,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,736 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:18:59,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:18:59,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:59,924 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:18:59,925 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 202 treesize of output 190 [2021-11-21 00:19:00,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:00,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:19:00,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:19:00,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:00,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:00,444 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 98 treesize of output 88 [2021-11-21 00:19:00,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:01,163 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:01,174 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:19:01,174 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 30 treesize of output 25 [2021-11-21 00:19:06,378 INFO L354 Elim1Store]: treesize reduction 245, result has 22.2 percent of original size [2021-11-21 00:19:06,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 268 treesize of output 285 [2021-11-21 00:19:10,811 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:10,812 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 195 treesize of output 234 [2021-11-21 00:19:12,526 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:12,526 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 195 treesize of output 234 [2021-11-21 00:19:13,917 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:19:14,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:15,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:15,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:15,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 00:19:15,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495426420] [2021-11-21 00:19:15,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:15,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:19:15,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:15,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:19:15,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=273, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:19:15,141 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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) [2021-11-21 00:19:15,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:15,239 INFO L93 Difference]: Finished difference Result 66 states and 90 transitions. [2021-11-21 00:19:15,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:19:15,240 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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 20 [2021-11-21 00:19:15,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:15,241 INFO L225 Difference]: With dead ends: 66 [2021-11-21 00:19:15,242 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 00:19:15,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=107, Invalid=273, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:19:15,244 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 45 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:15,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 35 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:19:15,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 00:19:15,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 28. [2021-11-21 00:19:15,255 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) [2021-11-21 00:19:15,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-21 00:19:15,256 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 20 [2021-11-21 00:19:15,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:15,256 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-21 00:19:15,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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) [2021-11-21 00:19:15,257 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-21 00:19:15,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:19:15,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:15,258 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:15,303 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 00:19:15,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:15,477 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:15,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:15,478 INFO L85 PathProgramCache]: Analyzing trace with hash 930745131, now seen corresponding path program 2 times [2021-11-21 00:19:15,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:15,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194601526] [2021-11-21 00:19:15,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:15,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:15,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:19:15,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:15,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194601526] [2021-11-21 00:19:15,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194601526] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:15,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959868762] [2021-11-21 00:19:15,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:19:15,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:15,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:15,592 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:15,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:19:15,657 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:19:15,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:15,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:19:15,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:15,707 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:19:15,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:15,759 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:19:15,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959868762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:15,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529739719] [2021-11-21 00:19:15,763 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:15,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:15,764 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:15,764 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:15,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:15,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,799 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:19:15,800 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 [2021-11-21 00:19:15,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,830 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:19:15,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:19:15,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:15,978 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:19:15,980 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 202 treesize of output 190 [2021-11-21 00:19:16,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:16,303 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 [2021-11-21 00:19:16,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:19:16,397 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 20 treesize of output 16 [2021-11-21 00:19:16,477 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:19:16,477 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 88 treesize of output 89 [2021-11-21 00:19:16,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:17,199 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:17,211 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:19:17,211 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 30 treesize of output 25 [2021-11-21 00:19:21,532 INFO L354 Elim1Store]: treesize reduction 245, result has 22.2 percent of original size [2021-11-21 00:19:21,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 268 treesize of output 285 [2021-11-21 00:19:24,154 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:24,154 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 195 treesize of output 234 [2021-11-21 00:19:25,549 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:25,549 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 195 treesize of output 234 [2021-11-21 00:19:26,729 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:19:26,992 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:27,671 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:27,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:27,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 11 [2021-11-21 00:19:27,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558112692] [2021-11-21 00:19:27,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:27,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:19:27,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:27,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:19:27,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2021-11-21 00:19:27,673 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 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) [2021-11-21 00:19:27,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:27,828 INFO L93 Difference]: Finished difference Result 90 states and 125 transitions. [2021-11-21 00:19:27,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:19:27,829 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 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 [2021-11-21 00:19:27,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:27,830 INFO L225 Difference]: With dead ends: 90 [2021-11-21 00:19:27,830 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 00:19:27,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:19:27,831 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 99 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:27,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 58 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:19:27,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 00:19:27,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2021-11-21 00:19:27,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 43 states have internal predecessors, (57), 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) [2021-11-21 00:19:27,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 59 transitions. [2021-11-21 00:19:27,844 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 59 transitions. Word has length 23 [2021-11-21 00:19:27,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:27,844 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 59 transitions. [2021-11-21 00:19:27,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 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) [2021-11-21 00:19:27,845 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 59 transitions. [2021-11-21 00:19:27,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 00:19:27,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:27,846 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:27,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:28,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:19:28,061 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:28,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:28,062 INFO L85 PathProgramCache]: Analyzing trace with hash -654342969, now seen corresponding path program 3 times [2021-11-21 00:19:28,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:28,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600269795] [2021-11-21 00:19:28,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:28,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:28,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:28,177 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:28,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:28,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600269795] [2021-11-21 00:19:28,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600269795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:28,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751409592] [2021-11-21 00:19:28,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:19:28,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:28,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:28,179 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:28,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:19:28,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:19:28,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:28,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:19:28,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:28,311 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:28,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:28,412 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:28,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751409592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:28,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483605150] [2021-11-21 00:19:28,414 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:28,414 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:28,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:28,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:28,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:28,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,437 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:19:28,438 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 [2021-11-21 00:19:28,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,464 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:19:28,465 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 [2021-11-21 00:19:28,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:19:28,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,599 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:19:28,599 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 202 treesize of output 190 [2021-11-21 00:19:28,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:28,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:19:28,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:19:28,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:28,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:28,911 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 98 treesize of output 88 [2021-11-21 00:19:29,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:29,346 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:29,358 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:19:29,358 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 [2021-11-21 00:19:30,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:31,024 INFO L354 Elim1Store]: treesize reduction 253, result has 24.0 percent of original size [2021-11-21 00:19:31,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 133 treesize of output 156 [2021-11-21 00:19:35,052 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:35,053 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 195 treesize of output 234 [2021-11-21 00:19:36,512 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:36,512 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 195 treesize of output 234 [2021-11-21 00:19:37,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:19:37,686 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:38,312 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:38,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:38,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2021-11-21 00:19:38,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464191125] [2021-11-21 00:19:38,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:38,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 00:19:38,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:38,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 00:19:38,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=493, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:19:38,315 INFO L87 Difference]: Start difference. First operand 46 states and 59 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-11-21 00:19:38,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:38,473 INFO L93 Difference]: Finished difference Result 140 states and 196 transitions. [2021-11-21 00:19:38,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:19:38,474 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 33 [2021-11-21 00:19:38,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:38,479 INFO L225 Difference]: With dead ends: 140 [2021-11-21 00:19:38,480 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:19:38,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=263, Invalid=493, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:19:38,482 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 88 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:38,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 57 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:19:38,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:19:38,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 53. [2021-11-21 00:19:38,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 50 states have (on average 1.28) internal successors, (64), 50 states have internal predecessors, (64), 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) [2021-11-21 00:19:38,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 66 transitions. [2021-11-21 00:19:38,515 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 66 transitions. Word has length 33 [2021-11-21 00:19:38,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:38,515 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 66 transitions. [2021-11-21 00:19:38,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-11-21 00:19:38,516 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 66 transitions. [2021-11-21 00:19:38,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:19:38,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:38,519 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:38,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:38,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:19:38,731 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:38,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:38,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1020231475, now seen corresponding path program 4 times [2021-11-21 00:19:38,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:38,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001111378] [2021-11-21 00:19:38,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:38,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:38,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:38,954 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:38,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:38,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001111378] [2021-11-21 00:19:38,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001111378] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:38,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293818036] [2021-11-21 00:19:38,955 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:19:38,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:38,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:38,956 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:38,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:19:39,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:39,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:19:39,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:39,132 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:39,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:39,422 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:39,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293818036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:39,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [165900399] [2021-11-21 00:19:39,425 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:39,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:39,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:39,426 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:39,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:39,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,450 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:19:39,450 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 [2021-11-21 00:19:39,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,499 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:19:39,500 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 [2021-11-21 00:19:39,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:19:39,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,623 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:39,660 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:19:39,661 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 192 treesize of output 191 [2021-11-21 00:19:39,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:39,929 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 [2021-11-21 00:19:39,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:19:39,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:40,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:40,053 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 98 treesize of output 88 [2021-11-21 00:19:40,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:40,578 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:40,587 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:19:40,587 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 30 treesize of output 25 [2021-11-21 00:19:42,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:42,265 INFO L354 Elim1Store]: treesize reduction 233, result has 24.4 percent of original size [2021-11-21 00:19:42,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 128 treesize of output 151 [2021-11-21 00:19:46,873 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:46,874 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 195 treesize of output 234 [2021-11-21 00:19:48,595 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:48,596 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 195 treesize of output 234 [2021-11-21 00:19:49,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:19:50,038 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:50,705 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:50,705 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:50,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2021-11-21 00:19:50,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104692432] [2021-11-21 00:19:50,706 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:50,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 00:19:50,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:50,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 00:19:50,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=690, Invalid=1032, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:19:50,708 INFO L87 Difference]: Start difference. First operand 53 states and 66 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 28 states have internal predecessors, (44), 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) [2021-11-21 00:19:51,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:51,121 INFO L93 Difference]: Finished difference Result 210 states and 301 transitions. [2021-11-21 00:19:51,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:19:51,122 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 28 states have internal predecessors, (44), 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 40 [2021-11-21 00:19:51,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:51,124 INFO L225 Difference]: With dead ends: 210 [2021-11-21 00:19:51,124 INFO L226 Difference]: Without dead ends: 171 [2021-11-21 00:19:51,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=690, Invalid=1032, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:19:51,127 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 224 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:51,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 57 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:19:51,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-21 00:19:51,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 67. [2021-11-21 00:19:51,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 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) [2021-11-21 00:19:51,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 80 transitions. [2021-11-21 00:19:51,152 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 80 transitions. Word has length 40 [2021-11-21 00:19:51,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:51,153 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 80 transitions. [2021-11-21 00:19:51,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 28 states have internal predecessors, (44), 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) [2021-11-21 00:19:51,153 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 80 transitions. [2021-11-21 00:19:51,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:19:51,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:51,155 INFO L514 BasicCegarLoop]: trace histogram [26, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:51,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:51,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:51,369 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:51,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:51,370 INFO L85 PathProgramCache]: Analyzing trace with hash -2007004275, now seen corresponding path program 5 times [2021-11-21 00:19:51,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:51,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526258799] [2021-11-21 00:19:51,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:51,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:51,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:51,915 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:19:51,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:51,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526258799] [2021-11-21 00:19:51,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526258799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:51,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062899018] [2021-11-21 00:19:51,915 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:19:51,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:51,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:51,916 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:51,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:19:51,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:19:51,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:51,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:19:51,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:52,151 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2021-11-21 00:19:52,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:52,309 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2021-11-21 00:19:52,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062899018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:52,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1478722198] [2021-11-21 00:19:52,311 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:52,312 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:52,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:52,312 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:52,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:52,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:52,353 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:19:52,353 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 [2021-11-21 00:19:52,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:52,375 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:19:52,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:52,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:19:52,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:52,495 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:52,521 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:19:52,521 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 192 treesize of output 191 [2021-11-21 00:19:52,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:52,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:19:52,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:19:52,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:52,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:52,981 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 98 treesize of output 88 [2021-11-21 00:19:53,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:19:53,524 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:53,533 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:19:53,533 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 30 treesize of output 25 [2021-11-21 00:19:55,471 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:19:55,562 INFO L354 Elim1Store]: treesize reduction 233, result has 24.4 percent of original size [2021-11-21 00:19:55,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 128 treesize of output 151 [2021-11-21 00:19:59,806 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:19:59,806 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 195 treesize of output 234 [2021-11-21 00:20:01,183 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:20:01,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 195 treesize of output 234 [2021-11-21 00:20:02,155 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:20:02,380 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:03,114 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:03,114 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:20:03,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 7, 7] total 39 [2021-11-21 00:20:03,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803240188] [2021-11-21 00:20:03,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:03,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:20:03,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:03,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:20:03,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=1897, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:20:03,118 INFO L87 Difference]: Start difference. First operand 67 states and 80 transitions. Second operand has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 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) [2021-11-21 00:20:03,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:03,715 INFO L93 Difference]: Finished difference Result 265 states and 375 transitions. [2021-11-21 00:20:03,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-21 00:20:03,716 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 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 54 [2021-11-21 00:20:03,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:03,719 INFO L225 Difference]: With dead ends: 265 [2021-11-21 00:20:03,719 INFO L226 Difference]: Without dead ends: 226 [2021-11-21 00:20:03,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1178 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1145, Invalid=2637, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 00:20:03,726 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 440 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 467 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:03,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [467 Valid, 130 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:20:03,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-21 00:20:03,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 116. [2021-11-21 00:20:03,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 113 states have (on average 1.2831858407079646) internal successors, (145), 113 states have internal predecessors, (145), 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) [2021-11-21 00:20:03,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 147 transitions. [2021-11-21 00:20:03,769 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 147 transitions. Word has length 54 [2021-11-21 00:20:03,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:03,769 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 147 transitions. [2021-11-21 00:20:03,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 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) [2021-11-21 00:20:03,770 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 147 transitions. [2021-11-21 00:20:03,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 00:20:03,773 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:03,773 INFO L514 BasicCegarLoop]: trace histogram [27, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:03,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:03,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:03,989 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:03,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:03,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1376599399, now seen corresponding path program 6 times [2021-11-21 00:20:03,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:03,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641926925] [2021-11-21 00:20:03,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:03,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:04,555 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:04,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:04,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641926925] [2021-11-21 00:20:04,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641926925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:04,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100451701] [2021-11-21 00:20:04,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:20:04,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:04,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:04,557 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:04,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:20:04,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:20:04,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:20:04,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 00:20:04,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:04,860 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:04,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:05,981 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:05,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100451701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:20:05,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [810522386] [2021-11-21 00:20:05,984 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:05,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:05,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:05,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:05,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:06,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:06,018 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:20:06,020 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 [2021-11-21 00:20:06,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:06,054 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:20:06,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:06,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:20:06,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:06,163 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:20:06,187 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:20:06,189 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 192 treesize of output 191 [2021-11-21 00:20:06,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:06,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:20:06,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:20:06,600 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 20 treesize of output 16 [2021-11-21 00:20:06,677 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:20:06,678 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 88 treesize of output 89 [2021-11-21 00:20:06,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:07,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:20:07,304 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:20:07,304 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 30 treesize of output 25 [2021-11-21 00:20:08,926 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:20:09,025 INFO L354 Elim1Store]: treesize reduction 233, result has 24.4 percent of original size [2021-11-21 00:20:09,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 128 treesize of output 151 [2021-11-21 00:20:13,369 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:20:13,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 195 treesize of output 234 [2021-11-21 00:20:15,031 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:20:15,032 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 195 treesize of output 234 [2021-11-21 00:20:15,991 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:20:16,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:16,908 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:16,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:20:16,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 58 [2021-11-21 00:20:16,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009025947] [2021-11-21 00:20:16,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:16,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 00:20:16,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:16,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 00:20:16,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2265, Invalid=2847, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 00:20:16,913 INFO L87 Difference]: Start difference. First operand 116 states and 147 transitions. Second operand has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 58 states have internal predecessors, (74), 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) [2021-11-21 00:20:17,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:17,812 INFO L93 Difference]: Finished difference Result 456 states and 658 transitions. [2021-11-21 00:20:17,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-21 00:20:17,813 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 58 states have internal predecessors, (74), 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 79 [2021-11-21 00:20:17,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:17,816 INFO L225 Difference]: With dead ends: 456 [2021-11-21 00:20:17,817 INFO L226 Difference]: Without dead ends: 369 [2021-11-21 00:20:17,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1498 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2265, Invalid=2847, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 00:20:17,820 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 656 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 486 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 712 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 486 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:17,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [712 Valid, 94 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [486 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:20:17,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-21 00:20:17,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 145. [2021-11-21 00:20:17,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 142 states have (on average 1.2253521126760563) internal successors, (174), 142 states have internal predecessors, (174), 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) [2021-11-21 00:20:17,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 176 transitions. [2021-11-21 00:20:17,858 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 176 transitions. Word has length 79 [2021-11-21 00:20:17,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:17,859 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 176 transitions. [2021-11-21 00:20:17,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 58 states have internal predecessors, (74), 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) [2021-11-21 00:20:17,860 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 176 transitions. [2021-11-21 00:20:17,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-21 00:20:17,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:17,862 INFO L514 BasicCegarLoop]: trace histogram [56, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:17,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 00:20:18,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:20:18,077 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:18,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:18,077 INFO L85 PathProgramCache]: Analyzing trace with hash 623736493, now seen corresponding path program 7 times [2021-11-21 00:20:18,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:18,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655639534] [2021-11-21 00:20:18,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:18,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:18,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:19,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1796 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:19,559 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:19,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655639534] [2021-11-21 00:20:19,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655639534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:19,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421414868] [2021-11-21 00:20:19,559 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:20:19,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:19,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:19,561 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:19,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:20:19,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:19,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-21 00:20:19,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:19,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1796 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:19,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:23,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1796 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:23,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421414868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:20:23,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841209075] [2021-11-21 00:20:23,633 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:23,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:23,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:23,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:23,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:23,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,658 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:20:23,659 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 [2021-11-21 00:20:23,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,690 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:20:23,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:20:23,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:23,846 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:20:23,847 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 202 treesize of output 190 [2021-11-21 00:20:23,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:24,041 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 [2021-11-21 00:20:24,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:20:24,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:24,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:24,167 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 98 treesize of output 88 [2021-11-21 00:20:24,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:24,783 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:20:24,794 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:20:24,794 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 30 treesize of output 25 [2021-11-21 00:20:28,730 INFO L354 Elim1Store]: treesize reduction 245, result has 22.2 percent of original size [2021-11-21 00:20:28,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 268 treesize of output 285 [2021-11-21 00:20:32,823 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:20:32,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 195 treesize of output 234 [2021-11-21 00:20:34,792 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:20:34,792 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 195 treesize of output 234 [2021-11-21 00:20:36,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:20:36,467 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:37,291 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:37,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:20:37,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 116 [2021-11-21 00:20:37,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287965945] [2021-11-21 00:20:37,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:37,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-21 00:20:37,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:37,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-21 00:20:37,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7862, Invalid=8908, Unknown=0, NotChecked=0, Total=16770 [2021-11-21 00:20:37,301 INFO L87 Difference]: Start difference. First operand 145 states and 176 transitions. Second operand has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 116 states have internal predecessors, (132), 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) [2021-11-21 00:20:41,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:41,087 INFO L93 Difference]: Finished difference Result 746 states and 1093 transitions. [2021-11-21 00:20:41,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-21 00:20:41,088 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 116 states have internal predecessors, (132), 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 108 [2021-11-21 00:20:41,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:41,094 INFO L225 Difference]: With dead ends: 746 [2021-11-21 00:20:41,094 INFO L226 Difference]: Without dead ends: 659 [2021-11-21 00:20:41,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3006 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7862, Invalid=8908, Unknown=0, NotChecked=0, Total=16770 [2021-11-21 00:20:41,103 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 1049 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 1171 mSolverCounterSat, 763 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1163 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 1934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 763 IncrementalHoareTripleChecker+Valid, 1171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:41,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1163 Valid, 166 Invalid, 1934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [763 Valid, 1171 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-21 00:20:41,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-11-21 00:20:41,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 203. [2021-11-21 00:20:41,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 200 states have (on average 1.16) internal successors, (232), 200 states have internal predecessors, (232), 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) [2021-11-21 00:20:41,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 234 transitions. [2021-11-21 00:20:41,164 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 234 transitions. Word has length 108 [2021-11-21 00:20:41,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:41,165 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 234 transitions. [2021-11-21 00:20:41,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 116 states have internal predecessors, (132), 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) [2021-11-21 00:20:41,166 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 234 transitions. [2021-11-21 00:20:41,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-21 00:20:41,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:41,179 INFO L514 BasicCegarLoop]: trace histogram [114, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:41,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:41,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:20:41,393 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:41,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:41,394 INFO L85 PathProgramCache]: Analyzing trace with hash -18366227, now seen corresponding path program 8 times [2021-11-21 00:20:41,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:41,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550099386] [2021-11-21 00:20:41,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:41,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:41,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:46,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6755 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:20:46,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:46,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550099386] [2021-11-21 00:20:46,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550099386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:46,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163277266] [2021-11-21 00:20:46,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:20:46,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:46,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:46,686 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:46,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:20:47,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:20:47,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:20:47,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:20:47,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:48,222 INFO L134 CoverageAnalysis]: Checked inductivity of 6755 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6700 trivial. 0 not checked. [2021-11-21 00:20:48,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:48,960 INFO L134 CoverageAnalysis]: Checked inductivity of 6755 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6700 trivial. 0 not checked. [2021-11-21 00:20:48,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163277266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:20:48,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342801548] [2021-11-21 00:20:48,962 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:48,962 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:48,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:48,963 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:48,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:48,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:48,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,011 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:20:49,011 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 [2021-11-21 00:20:49,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,035 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:20:49,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:20:49,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:49,159 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:20:49,160 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 202 treesize of output 190 [2021-11-21 00:20:49,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:49,320 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 [2021-11-21 00:20:49,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:20:49,367 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 20 treesize of output 16 [2021-11-21 00:20:49,439 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:20:49,439 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 88 treesize of output 89 [2021-11-21 00:20:49,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:20:49,938 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:20:49,946 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:20:49,947 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 30 treesize of output 25 [2021-11-21 00:20:53,785 INFO L354 Elim1Store]: treesize reduction 245, result has 22.2 percent of original size [2021-11-21 00:20:53,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 268 treesize of output 285 [2021-11-21 00:21:00,601 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:21:00,601 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 195 treesize of output 234 [2021-11-21 00:21:02,557 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:21:02,558 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 195 treesize of output 234 [2021-11-21 00:21:04,034 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:21:04,253 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:05,311 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:05,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:05,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 13, 13] total 139 [2021-11-21 00:21:05,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082522451] [2021-11-21 00:21:05,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:05,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2021-11-21 00:21:05,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:05,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-11-21 00:21:05,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8137, Invalid=14815, Unknown=0, NotChecked=0, Total=22952 [2021-11-21 00:21:05,320 INFO L87 Difference]: Start difference. First operand 203 states and 234 transitions. Second operand has 139 states, 139 states have (on average 1.129496402877698) internal successors, (157), 139 states have internal predecessors, (157), 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) [2021-11-21 00:21:10,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:10,452 INFO L93 Difference]: Finished difference Result 849 states and 1201 transitions. [2021-11-21 00:21:10,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-21 00:21:10,453 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.129496402877698) internal successors, (157), 139 states have internal predecessors, (157), 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 166 [2021-11-21 00:21:10,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:10,460 INFO L225 Difference]: With dead ends: 849 [2021-11-21 00:21:10,460 INFO L226 Difference]: Without dead ends: 762 [2021-11-21 00:21:10,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 462 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5917 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=11195, Invalid=18907, Unknown=0, NotChecked=0, Total=30102 [2021-11-21 00:21:10,464 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 1810 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 1284 mSolverCounterSat, 1020 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1925 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 2304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1020 IncrementalHoareTripleChecker+Valid, 1284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:10,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1925 Valid, 710 Invalid, 2304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1020 Valid, 1284 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 00:21:10,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-11-21 00:21:10,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 300. [2021-11-21 00:21:10,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 297 states have (on average 1.228956228956229) internal successors, (365), 297 states have internal predecessors, (365), 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) [2021-11-21 00:21:10,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 367 transitions. [2021-11-21 00:21:10,526 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 367 transitions. Word has length 166 [2021-11-21 00:21:10,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:10,527 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 367 transitions. [2021-11-21 00:21:10,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.129496402877698) internal successors, (157), 139 states have internal predecessors, (157), 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) [2021-11-21 00:21:10,528 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 367 transitions. [2021-11-21 00:21:10,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-11-21 00:21:10,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:10,531 INFO L514 BasicCegarLoop]: trace histogram [115, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:10,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:10,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:10,747 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:10,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:10,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1818470183, now seen corresponding path program 9 times [2021-11-21 00:21:10,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:10,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695247240] [2021-11-21 00:21:10,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:10,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:10,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:16,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7638 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:21:16,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:16,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695247240] [2021-11-21 00:21:16,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695247240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:16,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617501045] [2021-11-21 00:21:16,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:21:16,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:16,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:16,173 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:16,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:21:16,454 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:21:16,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:16,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 1534 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-21 00:21:16,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:16,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7638 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:21:16,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:31,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7638 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:21:31,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617501045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:31,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825036508] [2021-11-21 00:21:31,689 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:21:31,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:31,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:31,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:31,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:31,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:31,713 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:21:31,713 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 [2021-11-21 00:21:31,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:31,738 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:21:31,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:31,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:21:31,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:31,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:21:31,879 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:21:31,880 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 192 treesize of output 191 [2021-11-21 00:21:32,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:21:32,194 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 [2021-11-21 00:21:32,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:21:32,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:21:32,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:32,364 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 98 treesize of output 88 [2021-11-21 00:21:32,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:21:32,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:21:32,961 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:21:32,961 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 30 treesize of output 25 [2021-11-21 00:21:37,613 INFO L354 Elim1Store]: treesize reduction 245, result has 22.2 percent of original size [2021-11-21 00:21:37,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 268 treesize of output 285 [2021-11-21 00:21:40,475 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:21:40,475 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 195 treesize of output 234 [2021-11-21 00:21:42,845 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:21:42,846 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 195 treesize of output 234 [2021-11-21 00:21:43,796 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:21:44,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:44,894 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:44,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:44,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 234 [2021-11-21 00:21:44,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429764861] [2021-11-21 00:21:44,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:44,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2021-11-21 00:21:44,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:44,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2021-11-21 00:21:44,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29633, Invalid=31623, Unknown=0, NotChecked=0, Total=61256 [2021-11-21 00:21:44,905 INFO L87 Difference]: Start difference. First operand 300 states and 367 transitions. Second operand has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 234 states have internal predecessors, (250), 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) [2021-11-21 00:22:14,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:14,960 INFO L93 Difference]: Finished difference Result 1528 states and 2242 transitions. [2021-11-21 00:22:14,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2021-11-21 00:22:14,960 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 234 states have internal predecessors, (250), 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 215 [2021-11-21 00:22:14,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:14,970 INFO L225 Difference]: With dead ends: 1528 [2021-11-21 00:22:14,970 INFO L226 Difference]: Without dead ends: 1345 [2021-11-21 00:22:14,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 760 GetRequests, 514 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6074 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=29633, Invalid=31623, Unknown=0, NotChecked=0, Total=61256 [2021-11-21 00:22:14,975 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 2365 mSDsluCounter, 442 mSDsCounter, 0 mSdLazyCounter, 2679 mSolverCounterSat, 1846 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2597 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 4525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1846 IncrementalHoareTripleChecker+Valid, 2679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:14,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2597 Valid, 298 Invalid, 4525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1846 Valid, 2679 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 00:22:14,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1345 states. [2021-11-21 00:22:15,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1345 to 417. [2021-11-21 00:22:15,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 414 states have (on average 1.1642512077294687) internal successors, (482), 414 states have internal predecessors, (482), 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) [2021-11-21 00:22:15,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 484 transitions. [2021-11-21 00:22:15,090 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 484 transitions. Word has length 215 [2021-11-21 00:22:15,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:15,091 INFO L470 AbstractCegarLoop]: Abstraction has 417 states and 484 transitions. [2021-11-21 00:22:15,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 234 states have internal predecessors, (250), 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) [2021-11-21 00:22:15,092 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 484 transitions. [2021-11-21 00:22:15,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-11-21 00:22:15,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:15,098 INFO L514 BasicCegarLoop]: trace histogram [232, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:15,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:15,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:22:15,321 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:15,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:15,322 INFO L85 PathProgramCache]: Analyzing trace with hash -311813779, now seen corresponding path program 10 times [2021-11-21 00:22:15,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:15,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905748352] [2021-11-21 00:22:15,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:15,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:15,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:35,720 INFO L134 CoverageAnalysis]: Checked inductivity of 27996 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:22:35,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:35,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905748352] [2021-11-21 00:22:35,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905748352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:35,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948827365] [2021-11-21 00:22:35,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:35,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:35,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:35,721 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:35,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:22:36,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:36,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 2236 conjuncts, 234 conjunts are in the unsatisfiable core [2021-11-21 00:22:36,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:36,743 INFO L134 CoverageAnalysis]: Checked inductivity of 27996 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:22:36,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 27996 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2021-11-21 00:23:30,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948827365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:30,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1156516145] [2021-11-21 00:23:30,110 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:23:30,110 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:30,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:30,111 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:30,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:30,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:30,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:30,139 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 00:23:30,139 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 [2021-11-21 00:23:30,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:30,163 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:23:30,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:30,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:23:30,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:30,262 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:23:30,280 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:23:30,280 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 192 treesize of output 191 [2021-11-21 00:23:30,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:23:30,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:23:30,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-21 00:23:30,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:23:30,664 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:23:30,664 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 88 treesize of output 89 [2021-11-21 00:23:30,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:23:31,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:23:31,171 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:23:31,171 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 30 treesize of output 25 [2021-11-21 00:23:32,903 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:23:32,988 INFO L354 Elim1Store]: treesize reduction 233, result has 24.4 percent of original size [2021-11-21 00:23:32,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 128 treesize of output 151 [2021-11-21 00:23:38,121 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:23:38,121 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 195 treesize of output 234 [2021-11-21 00:23:40,012 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-21 00:23:40,012 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 195 treesize of output 234 [2021-11-21 00:23:41,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2021-11-21 00:23:41,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:43,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:43,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:43,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [234, 234, 234] total 468 [2021-11-21 00:23:43,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224178625] [2021-11-21 00:23:43,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:43,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2021-11-21 00:23:43,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:43,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2021-11-21 00:23:43,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113990, Invalid=117852, Unknown=0, NotChecked=0, Total=231842 [2021-11-21 00:23:43,068 INFO L87 Difference]: Start difference. First operand 417 states and 484 transitions. Second operand has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 468 states have internal predecessors, (484), 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) [2021-11-21 00:30:43,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:43,133 INFO L93 Difference]: Finished difference Result 2698 states and 3997 transitions. [2021-11-21 00:30:43,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2021-11-21 00:30:43,134 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 468 states have internal predecessors, (484), 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 332 [2021-11-21 00:30:43,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:43,151 INFO L225 Difference]: With dead ends: 2698 [2021-11-21 00:30:43,152 INFO L226 Difference]: Without dead ends: 2515 [2021-11-21 00:30:43,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1228 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 480 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12158 ImplicationChecksByTransitivity, 72.9s TimeCoverageRelationStatistics Valid=113990, Invalid=117852, Unknown=0, NotChecked=0, Total=231842 [2021-11-21 00:30:43,171 INFO L933 BasicCegarLoop]: 476 mSDtfsCounter, 5331 mSDsluCounter, 834 mSDsCounter, 0 mSdLazyCounter, 5690 mSolverCounterSat, 4311 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5797 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 10001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4311 IncrementalHoareTripleChecker+Valid, 5690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:43,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5797 Valid, 546 Invalid, 10001 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4311 Valid, 5690 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-21 00:30:43,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2515 states. [2021-11-21 00:30:43,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2515 to 651. [2021-11-21 00:30:43,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 651 states, 648 states have (on average 1.1049382716049383) internal successors, (716), 648 states have internal predecessors, (716), 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) [2021-11-21 00:30:43,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 651 states to 651 states and 718 transitions. [2021-11-21 00:30:43,424 INFO L78 Accepts]: Start accepts. Automaton has 651 states and 718 transitions. Word has length 332 [2021-11-21 00:30:43,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:43,424 INFO L470 AbstractCegarLoop]: Abstraction has 651 states and 718 transitions. [2021-11-21 00:30:43,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 468 states have internal predecessors, (484), 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) [2021-11-21 00:30:43,426 INFO L276 IsEmpty]: Start isEmpty. Operand 651 states and 718 transitions. [2021-11-21 00:30:43,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 567 [2021-11-21 00:30:43,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:43,441 INFO L514 BasicCegarLoop]: trace histogram [466, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:30:43,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:43,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7541f3-0857-4c66-afed-f9c8b5d19e3e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:30:43,669 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:30:43,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:43,670 INFO L85 PathProgramCache]: Analyzing trace with hash 745759149, now seen corresponding path program 11 times [2021-11-21 00:30:43,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:43,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107089274] [2021-11-21 00:30:43,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:43,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:45,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat