./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/psyco/psyco_abp_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/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_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/psyco/psyco_abp_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/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_45d304b8-168d-4267-a949-63133eb46882/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 39adc6d5c92d5d4be7746cac0afbcc96f3b450588f18f3eb2d03a3ab1e20a3ef --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:12:50,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:12:50,465 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:12:50,525 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:12:50,526 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:12:50,531 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:12:50,533 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:12:50,537 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:12:50,539 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:12:50,547 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:12:50,548 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:12:50,551 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:12:50,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:12:50,554 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:12:50,556 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:12:50,562 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:12:50,564 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:12:50,565 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:12:50,568 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:12:50,579 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:12:50,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:12:50,583 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:12:50,586 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:12:50,588 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:12:50,597 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:12:50,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:12:50,598 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:12:50,600 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:12:50,601 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:12:50,602 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:12:50,603 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:12:50,604 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:12:50,606 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:12:50,607 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:12:50,609 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:12:50,609 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:12:50,610 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:12:50,611 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:12:50,611 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:12:50,612 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:12:50,613 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:12:50,614 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:12:50,660 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:12:50,661 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:12:50,661 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:12:50,662 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:12:50,663 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:12:50,669 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:12:50,670 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:12:50,670 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:12:50,671 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:12:50,671 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:12:50,672 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:12:50,672 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:12:50,673 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:12:50,673 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:12:50,673 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:12:50,673 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:12:50,674 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:12:50,674 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:12:50,675 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:12:50,675 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:12:50,675 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:12:50,675 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:12:50,676 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:12:50,676 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:12:50,676 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:12:50,676 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:12:50,678 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:12:50,678 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:12:50,679 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:12:50,679 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:12:50,679 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:12:50,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:12:50,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:12:50,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:12:50,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:12:50,681 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:12:50,681 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:12:50,681 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:12:50,681 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:12:50,682 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:12:50,682 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:12:50,682 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_45d304b8-168d-4267-a949-63133eb46882/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39adc6d5c92d5d4be7746cac0afbcc96f3b450588f18f3eb2d03a3ab1e20a3ef [2021-11-20 23:12:51,007 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:12:51,027 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:12:51,030 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:12:51,031 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:12:51,036 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:12:51,038 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/psyco/psyco_abp_1-1.c [2021-11-20 23:12:51,111 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/data/9ff4944c0/a9927fc6fdfb437f8898e0e357ba26b4/FLAG6294244ea [2021-11-20 23:12:51,652 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:12:51,655 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/sv-benchmarks/c/psyco/psyco_abp_1-1.c [2021-11-20 23:12:51,676 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/data/9ff4944c0/a9927fc6fdfb437f8898e0e357ba26b4/FLAG6294244ea [2021-11-20 23:12:51,937 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/data/9ff4944c0/a9927fc6fdfb437f8898e0e357ba26b4 [2021-11-20 23:12:51,940 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:12:51,943 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:12:51,944 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:12:51,945 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:12:51,948 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:12:51,949 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:12:51" (1/1) ... [2021-11-20 23:12:51,950 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eb168ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:51, skipping insertion in model container [2021-11-20 23:12:51,950 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:12:51" (1/1) ... [2021-11-20 23:12:51,957 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:12:51,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:12:52,323 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_45d304b8-168d-4267-a949-63133eb46882/sv-benchmarks/c/psyco/psyco_abp_1-1.c[24818,24831] [2021-11-20 23:12:52,330 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:12:52,338 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:12:52,416 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_45d304b8-168d-4267-a949-63133eb46882/sv-benchmarks/c/psyco/psyco_abp_1-1.c[24818,24831] [2021-11-20 23:12:52,419 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:12:52,435 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:12:52,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52 WrapperNode [2021-11-20 23:12:52,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:12:52,438 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:12:52,438 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:12:52,438 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:12:52,446 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,470 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,525 INFO L137 Inliner]: procedures = 12, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 417 [2021-11-20 23:12:52,526 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:12:52,528 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:12:52,528 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:12:52,528 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:12:52,537 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,537 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,557 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,602 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,613 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,631 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:12:52,638 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:12:52,638 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:12:52,638 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:12:52,639 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (1/1) ... [2021-11-20 23:12:52,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:12:52,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:12:52,671 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:12:52,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:12:52,721 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:12:52,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:12:52,721 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:12:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:12:52,827 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:12:52,829 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:12:53,555 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:12:53,591 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:12:53,592 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:12:53,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:12:53 BoogieIcfgContainer [2021-11-20 23:12:53,595 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:12:53,597 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:12:53,597 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:12:53,600 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:12:53,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:12:51" (1/3) ... [2021-11-20 23:12:53,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aa87e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:12:53, skipping insertion in model container [2021-11-20 23:12:53,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:52" (2/3) ... [2021-11-20 23:12:53,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aa87e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:12:53, skipping insertion in model container [2021-11-20 23:12:53,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:12:53" (3/3) ... [2021-11-20 23:12:53,604 INFO L111 eAbstractionObserver]: Analyzing ICFG psyco_abp_1-1.c [2021-11-20 23:12:53,609 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:12:53,609 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:12:53,670 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:12:53,682 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 [2021-11-20 23:12:53,683 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:12:53,707 INFO L276 IsEmpty]: Start isEmpty. Operand has 107 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 106 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:53,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:12:53,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:53,715 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:53,715 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:53,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:53,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1655152119, now seen corresponding path program 1 times [2021-11-20 23:12:53,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:53,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086137531] [2021-11-20 23:12:53,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:53,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:53,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:53,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:53,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:53,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086137531] [2021-11-20 23:12:53,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086137531] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:53,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:53,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:12:53,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676878324] [2021-11-20 23:12:53,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:53,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 23:12:53,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:53,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 23:12:53,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:12:53,978 INFO L87 Difference]: Start difference. First operand has 107 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 106 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:54,039 INFO L93 Difference]: Finished difference Result 213 states and 413 transitions. [2021-11-20 23:12:54,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 23:12:54,043 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:12:54,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:54,056 INFO L225 Difference]: With dead ends: 213 [2021-11-20 23:12:54,056 INFO L226 Difference]: Without dead ends: 104 [2021-11-20 23:12:54,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:12:54,064 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:54,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 199 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:12:54,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-20 23:12:54,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-20 23:12:54,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.6893203883495145) internal successors, (174), 103 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 174 transitions. [2021-11-20 23:12:54,121 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 174 transitions. Word has length 8 [2021-11-20 23:12:54,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:54,121 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 174 transitions. [2021-11-20 23:12:54,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,122 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 174 transitions. [2021-11-20 23:12:54,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:12:54,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:54,125 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:54,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:12:54,126 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:54,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:54,127 INFO L85 PathProgramCache]: Analyzing trace with hash 762379355, now seen corresponding path program 1 times [2021-11-20 23:12:54,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:54,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174487732] [2021-11-20 23:12:54,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:54,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:54,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:54,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:54,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:54,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174487732] [2021-11-20 23:12:54,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174487732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:54,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:54,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:12:54,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927878764] [2021-11-20 23:12:54,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:54,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:12:54,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:54,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:12:54,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:54,246 INFO L87 Difference]: Start difference. First operand 104 states and 174 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:54,325 INFO L93 Difference]: Finished difference Result 210 states and 351 transitions. [2021-11-20 23:12:54,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:12:54,326 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:12:54,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:54,330 INFO L225 Difference]: With dead ends: 210 [2021-11-20 23:12:54,330 INFO L226 Difference]: Without dead ends: 107 [2021-11-20 23:12:54,331 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 [2021-11-20 23:12:54,333 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 4 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:54,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 323 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:12:54,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-20 23:12:54,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-20 23:12:54,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.669811320754717) internal successors, (177), 106 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 177 transitions. [2021-11-20 23:12:54,353 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 177 transitions. Word has length 9 [2021-11-20 23:12:54,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:54,356 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 177 transitions. [2021-11-20 23:12:54,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,357 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 177 transitions. [2021-11-20 23:12:54,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:12:54,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:54,359 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:54,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:12:54,360 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:54,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:54,366 INFO L85 PathProgramCache]: Analyzing trace with hash -197013714, now seen corresponding path program 1 times [2021-11-20 23:12:54,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:54,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92841984] [2021-11-20 23:12:54,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:54,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:54,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:54,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:54,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:54,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92841984] [2021-11-20 23:12:54,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92841984] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:54,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:54,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:12:54,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581421672] [2021-11-20 23:12:54,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:54,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:12:54,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:54,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:12:54,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:12:54,607 INFO L87 Difference]: Start difference. First operand 107 states and 177 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:54,917 INFO L93 Difference]: Finished difference Result 216 states and 354 transitions. [2021-11-20 23:12:54,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:12:54,917 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-20 23:12:54,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:54,920 INFO L225 Difference]: With dead ends: 216 [2021-11-20 23:12:54,920 INFO L226 Difference]: Without dead ends: 192 [2021-11-20 23:12:54,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:12:54,922 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 148 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:54,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 381 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:12:54,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-20 23:12:54,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 176. [2021-11-20 23:12:54,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.6571428571428573) internal successors, (290), 175 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 290 transitions. [2021-11-20 23:12:54,951 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 290 transitions. Word has length 14 [2021-11-20 23:12:54,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:54,952 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 290 transitions. [2021-11-20 23:12:54,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:54,952 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 290 transitions. [2021-11-20 23:12:54,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:12:54,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:54,967 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:54,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:12:54,967 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:54,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:54,968 INFO L85 PathProgramCache]: Analyzing trace with hash 938789430, now seen corresponding path program 1 times [2021-11-20 23:12:54,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:54,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106944357] [2021-11-20 23:12:54,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:54,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:54,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:55,036 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:55,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106944357] [2021-11-20 23:12:55,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106944357] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:55,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:55,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:12:55,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029946013] [2021-11-20 23:12:55,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:55,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:12:55,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:55,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:12:55,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:55,038 INFO L87 Difference]: Start difference. First operand 176 states and 290 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:55,093 INFO L93 Difference]: Finished difference Result 302 states and 496 transitions. [2021-11-20 23:12:55,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:12:55,094 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:12:55,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:55,095 INFO L225 Difference]: With dead ends: 302 [2021-11-20 23:12:55,098 INFO L226 Difference]: Without dead ends: 128 [2021-11-20 23:12:55,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:55,104 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 32 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:55,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 295 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:12:55,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-20 23:12:55,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2021-11-20 23:12:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.624) internal successors, (203), 125 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 203 transitions. [2021-11-20 23:12:55,128 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 203 transitions. Word has length 15 [2021-11-20 23:12:55,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:55,128 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 203 transitions. [2021-11-20 23:12:55,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,129 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 203 transitions. [2021-11-20 23:12:55,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:12:55,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:55,131 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:55,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:12:55,136 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:55,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:55,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1693191315, now seen corresponding path program 1 times [2021-11-20 23:12:55,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:55,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707009511] [2021-11-20 23:12:55,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:55,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:55,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:55,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:12:55,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:55,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707009511] [2021-11-20 23:12:55,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707009511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:55,225 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:55,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:12:55,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425590419] [2021-11-20 23:12:55,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:55,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:12:55,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:55,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:12:55,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:55,228 INFO L87 Difference]: Start difference. First operand 126 states and 203 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:55,273 INFO L93 Difference]: Finished difference Result 257 states and 414 transitions. [2021-11-20 23:12:55,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:12:55,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:12:55,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:55,275 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:12:55,275 INFO L226 Difference]: Without dead ends: 133 [2021-11-20 23:12:55,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:55,277 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 34 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:55,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 294 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:12:55,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-20 23:12:55,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-11-20 23:12:55,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.6) internal successors, (208), 130 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 208 transitions. [2021-11-20 23:12:55,288 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 208 transitions. Word has length 20 [2021-11-20 23:12:55,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:55,288 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 208 transitions. [2021-11-20 23:12:55,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:12:55,289 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 208 transitions. [2021-11-20 23:12:55,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-20 23:12:55,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:55,290 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:12:55,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:12:55,290 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:55,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:55,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1475234708, now seen corresponding path program 1 times [2021-11-20 23:12:55,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:55,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268586980] [2021-11-20 23:12:55,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:55,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:55,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:55,361 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:55,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:55,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268586980] [2021-11-20 23:12:55,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268586980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:12:55,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639156782] [2021-11-20 23:12:55,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:55,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:12:55,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:12:55,371 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:12:55,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:12:55,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:55,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:12:55,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:12:55,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:55,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:12:55,674 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:12:55,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639156782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:12:55,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839824474] [2021-11-20 23:12:55,692 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-20 23:12:55,692 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:12:55,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:12:55,702 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:12:55,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:05,354 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:07,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [839824474] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:07,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:07,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [4, 4, 4] total 18 [2021-11-20 23:13:07,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124102337] [2021-11-20 23:13:07,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:07,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 23:13:07,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:07,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 23:13:07,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:13:07,878 INFO L87 Difference]: Start difference. First operand 131 states and 208 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:09,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:09,373 INFO L93 Difference]: Finished difference Result 181 states and 277 transitions. [2021-11-20 23:13:09,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:13:09,374 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-20 23:13:09,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:09,375 INFO L225 Difference]: With dead ends: 181 [2021-11-20 23:13:09,376 INFO L226 Difference]: Without dead ends: 175 [2021-11-20 23:13:09,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:13:09,377 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 67 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:09,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 559 Invalid, 660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:13:09,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-20 23:13:09,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2021-11-20 23:13:09,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 168 states have (on average 1.5595238095238095) internal successors, (262), 168 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:09,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 262 transitions. [2021-11-20 23:13:09,390 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 262 transitions. Word has length 22 [2021-11-20 23:13:09,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:09,390 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 262 transitions. [2021-11-20 23:13:09,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:09,390 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 262 transitions. [2021-11-20 23:13:09,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:13:09,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:09,391 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:09,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:09,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:13:09,606 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:09,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:09,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1500920786, now seen corresponding path program 1 times [2021-11-20 23:13:09,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:09,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094352407] [2021-11-20 23:13:09,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:09,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:09,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:09,772 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:09,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:09,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094352407] [2021-11-20 23:13:09,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094352407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:09,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482778396] [2021-11-20 23:13:09,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:09,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:09,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:09,774 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:09,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:13:09,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:09,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:13:09,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:09,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:09,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:10,258 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:10,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482778396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:10,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155421403] [2021-11-20 23:13:10,263 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-20 23:13:10,264 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:10,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:10,264 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:10,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:19,442 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:22,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [155421403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:22,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:22,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [5, 4, 6] total 24 [2021-11-20 23:13:22,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615982714] [2021-11-20 23:13:22,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:22,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:13:22,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:22,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:13:22,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:13:22,212 INFO L87 Difference]: Start difference. First operand 169 states and 262 transitions. Second operand has 16 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:23,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:23,426 INFO L93 Difference]: Finished difference Result 176 states and 268 transitions. [2021-11-20 23:13:23,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:13:23,427 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-20 23:13:23,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:23,429 INFO L225 Difference]: With dead ends: 176 [2021-11-20 23:13:23,429 INFO L226 Difference]: Without dead ends: 174 [2021-11-20 23:13:23,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:13:23,430 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 81 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 473 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:23,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 473 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:13:23,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-20 23:13:23,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 170. [2021-11-20 23:13:23,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.5562130177514792) internal successors, (263), 169 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:23,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 263 transitions. [2021-11-20 23:13:23,449 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 263 transitions. Word has length 23 [2021-11-20 23:13:23,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:23,449 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 263 transitions. [2021-11-20 23:13:23,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:23,462 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 263 transitions. [2021-11-20 23:13:23,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 23:13:23,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:23,463 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:23,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:23,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:23,664 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:23,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:23,665 INFO L85 PathProgramCache]: Analyzing trace with hash 369462614, now seen corresponding path program 1 times [2021-11-20 23:13:23,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:23,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617434058] [2021-11-20 23:13:23,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:23,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:23,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:23,843 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:23,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:23,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617434058] [2021-11-20 23:13:23,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617434058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:23,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297441477] [2021-11-20 23:13:23,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:23,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:23,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:23,846 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:23,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:13:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:23,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:13:23,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:24,026 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:24,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:24,346 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:24,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297441477] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:24,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993009915] [2021-11-20 23:13:24,356 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-20 23:13:24,357 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:24,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:24,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:24,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:34,528 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:37,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [993009915] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:37,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:37,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [5, 4, 6] total 26 [2021-11-20 23:13:37,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171137897] [2021-11-20 23:13:37,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:37,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:13:37,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:37,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:13:37,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=477, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:13:37,416 INFO L87 Difference]: Start difference. First operand 170 states and 263 transitions. Second operand has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:38,809 INFO L93 Difference]: Finished difference Result 174 states and 266 transitions. [2021-11-20 23:13:38,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:13:38,810 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-20 23:13:38,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:38,811 INFO L225 Difference]: With dead ends: 174 [2021-11-20 23:13:38,812 INFO L226 Difference]: Without dead ends: 171 [2021-11-20 23:13:38,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=183, Invalid=519, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:13:38,813 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 63 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 900 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 658 SdHoareTripleChecker+Invalid, 939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:38,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 658 Invalid, 939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 900 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:13:38,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-20 23:13:38,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2021-11-20 23:13:38,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.5502958579881656) internal successors, (262), 169 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 262 transitions. [2021-11-20 23:13:38,823 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 262 transitions. Word has length 26 [2021-11-20 23:13:38,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:38,823 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 262 transitions. [2021-11-20 23:13:38,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,824 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 262 transitions. [2021-11-20 23:13:38,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:13:38,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:38,826 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:38,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:39,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:39,042 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:39,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:39,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1554530707, now seen corresponding path program 1 times [2021-11-20 23:13:39,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:39,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549195030] [2021-11-20 23:13:39,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:39,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:39,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:39,128 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-20 23:13:39,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:39,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549195030] [2021-11-20 23:13:39,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549195030] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:39,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:39,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:39,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472768520] [2021-11-20 23:13:39,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:39,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:39,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:39,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:39,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:39,131 INFO L87 Difference]: Start difference. First operand 170 states and 262 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:39,162 INFO L93 Difference]: Finished difference Result 262 states and 410 transitions. [2021-11-20 23:13:39,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:39,163 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-20 23:13:39,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:39,165 INFO L225 Difference]: With dead ends: 262 [2021-11-20 23:13:39,165 INFO L226 Difference]: Without dead ends: 133 [2021-11-20 23:13:39,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:39,166 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 69 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:39,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 202 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:39,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-20 23:13:39,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-11-20 23:13:39,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.5307692307692307) internal successors, (199), 130 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 199 transitions. [2021-11-20 23:13:39,175 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 199 transitions. Word has length 29 [2021-11-20 23:13:39,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:39,175 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 199 transitions. [2021-11-20 23:13:39,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,176 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 199 transitions. [2021-11-20 23:13:39,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:13:39,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:39,178 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:39,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:13:39,178 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:39,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:39,179 INFO L85 PathProgramCache]: Analyzing trace with hash -2135712591, now seen corresponding path program 1 times [2021-11-20 23:13:39,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:39,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301284094] [2021-11-20 23:13:39,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:39,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:39,328 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:13:39,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:39,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301284094] [2021-11-20 23:13:39,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301284094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:39,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415527324] [2021-11-20 23:13:39,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:39,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:39,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:39,333 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:39,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:13:39,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:39,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:13:39,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:39,578 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:13:39,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:39,909 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:13:39,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415527324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:39,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886299357] [2021-11-20 23:13:39,913 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-20 23:13:39,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:39,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:39,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:39,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:00,094 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:03,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:03,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:03,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 7] total 11 [2021-11-20 23:14:03,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923452296] [2021-11-20 23:14:03,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:03,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 23:14:03,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:03,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 23:14:03,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=828, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:14:03,611 INFO L87 Difference]: Start difference. First operand 131 states and 199 transitions. Second operand has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 11 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:04,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:04,371 INFO L93 Difference]: Finished difference Result 471 states and 718 transitions. [2021-11-20 23:14:04,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:14:04,372 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 11 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:14:04,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:04,374 INFO L225 Difference]: With dead ends: 471 [2021-11-20 23:14:04,374 INFO L226 Difference]: Without dead ends: 353 [2021-11-20 23:14:04,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=210, Invalid=1196, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:14:04,382 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 609 mSDsluCounter, 785 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 609 SdHoareTripleChecker+Valid, 984 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:04,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [609 Valid, 984 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:14:04,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-20 23:14:04,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 297. [2021-11-20 23:14:04,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.587837837837838) internal successors, (470), 296 states have internal predecessors, (470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:04,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 470 transitions. [2021-11-20 23:14:04,398 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 470 transitions. Word has length 32 [2021-11-20 23:14:04,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:04,399 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 470 transitions. [2021-11-20 23:14:04,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 11 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:04,399 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 470 transitions. [2021-11-20 23:14:04,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:14:04,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:04,401 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:04,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:04,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:04,618 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:04,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:04,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1771134383, now seen corresponding path program 1 times [2021-11-20 23:14:04,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:04,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614960046] [2021-11-20 23:14:04,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:04,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:04,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:04,717 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:14:04,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:04,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614960046] [2021-11-20 23:14:04,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614960046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:04,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441436678] [2021-11-20 23:14:04,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:04,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:04,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:04,721 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:04,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:14:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:04,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:14:04,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:04,921 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:14:04,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:05,023 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:14:05,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441436678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:05,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102689687] [2021-11-20 23:14:05,026 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-20 23:14:05,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:05,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:05,027 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:05,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:26,211 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:29,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:29,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:29,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2021-11-20 23:14:29,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252858458] [2021-11-20 23:14:29,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:29,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:14:29,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:29,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:14:29,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:14:29,920 INFO L87 Difference]: Start difference. First operand 297 states and 470 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:30,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:30,045 INFO L93 Difference]: Finished difference Result 389 states and 614 transitions. [2021-11-20 23:14:30,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:14:30,046 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-20 23:14:30,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:30,049 INFO L225 Difference]: With dead ends: 389 [2021-11-20 23:14:30,049 INFO L226 Difference]: Without dead ends: 367 [2021-11-20 23:14:30,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:14:30,051 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 230 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:30,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 441 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:30,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2021-11-20 23:14:30,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 349. [2021-11-20 23:14:30,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.5344827586206897) internal successors, (534), 348 states have internal predecessors, (534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:30,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 534 transitions. [2021-11-20 23:14:30,069 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 534 transitions. Word has length 33 [2021-11-20 23:14:30,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:30,070 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 534 transitions. [2021-11-20 23:14:30,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:30,070 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 534 transitions. [2021-11-20 23:14:30,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:14:30,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:30,072 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:30,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:30,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:30,298 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:30,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:30,299 INFO L85 PathProgramCache]: Analyzing trace with hash -886789566, now seen corresponding path program 1 times [2021-11-20 23:14:30,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:30,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278123503] [2021-11-20 23:14:30,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:30,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:30,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:30,556 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:30,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:30,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278123503] [2021-11-20 23:14:30,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278123503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:30,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56888212] [2021-11-20 23:14:30,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:30,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:30,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:30,562 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:30,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:14:30,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:30,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:14:30,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:30,958 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:30,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:31,481 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:31,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56888212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:31,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [762833308] [2021-11-20 23:14:31,488 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-20 23:14:31,488 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:31,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:31,489 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:31,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:52,386 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:56,483 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:56,483 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:56,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2021-11-20 23:14:56,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799970868] [2021-11-20 23:14:56,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:56,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:14:56,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:56,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:14:56,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=959, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:14:56,486 INFO L87 Difference]: Start difference. First operand 349 states and 534 transitions. Second operand has 10 states, 10 states have (on average 7.5) internal successors, (75), 10 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:56,692 INFO L93 Difference]: Finished difference Result 376 states and 566 transitions. [2021-11-20 23:14:56,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:14:56,693 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.5) internal successors, (75), 10 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:14:56,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:56,696 INFO L225 Difference]: With dead ends: 376 [2021-11-20 23:14:56,697 INFO L226 Difference]: Without dead ends: 374 [2021-11-20 23:14:56,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=163, Invalid=959, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:14:56,698 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 207 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:56,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 790 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:14:56,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-20 23:14:56,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 349. [2021-11-20 23:14:56,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.5316091954022988) internal successors, (533), 348 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 533 transitions. [2021-11-20 23:14:56,716 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 533 transitions. Word has length 35 [2021-11-20 23:14:56,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:56,716 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 533 transitions. [2021-11-20 23:14:56,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.5) internal successors, (75), 10 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,717 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 533 transitions. [2021-11-20 23:14:56,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:14:56,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:56,718 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:56,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:56,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:14:56,942 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:56,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:56,943 INFO L85 PathProgramCache]: Analyzing trace with hash -1595435041, now seen corresponding path program 1 times [2021-11-20 23:14:56,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:56,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681166255] [2021-11-20 23:14:56,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:56,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:56,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-20 23:14:57,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681166255] [2021-11-20 23:14:57,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681166255] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:57,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:57,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:14:57,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189098158] [2021-11-20 23:14:57,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:57,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:57,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:57,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:57,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:57,005 INFO L87 Difference]: Start difference. First operand 349 states and 533 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:57,044 INFO L93 Difference]: Finished difference Result 669 states and 1016 transitions. [2021-11-20 23:14:57,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:57,045 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:14:57,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:57,049 INFO L225 Difference]: With dead ends: 669 [2021-11-20 23:14:57,049 INFO L226 Difference]: Without dead ends: 361 [2021-11-20 23:14:57,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:57,053 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 32 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 234 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 [2021-11-20 23:14:57,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 234 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:57,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2021-11-20 23:14:57,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 359. [2021-11-20 23:14:57,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 358 states have (on average 1.488826815642458) internal successors, (533), 358 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 533 transitions. [2021-11-20 23:14:57,075 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 533 transitions. Word has length 36 [2021-11-20 23:14:57,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:57,076 INFO L470 AbstractCegarLoop]: Abstraction has 359 states and 533 transitions. [2021-11-20 23:14:57,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,077 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 533 transitions. [2021-11-20 23:14:57,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:14:57,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:57,078 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:57,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 23:14:57,079 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:57,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:57,079 INFO L85 PathProgramCache]: Analyzing trace with hash 852693590, now seen corresponding path program 1 times [2021-11-20 23:14:57,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:57,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380457990] [2021-11-20 23:14:57,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:57,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:57,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:57,147 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-20 23:14:57,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:57,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380457990] [2021-11-20 23:14:57,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380457990] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:57,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:57,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:14:57,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422027564] [2021-11-20 23:14:57,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:57,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:57,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:57,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:57,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:57,151 INFO L87 Difference]: Start difference. First operand 359 states and 533 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:57,186 INFO L93 Difference]: Finished difference Result 463 states and 685 transitions. [2021-11-20 23:14:57,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:57,187 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-20 23:14:57,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:57,189 INFO L225 Difference]: With dead ends: 463 [2021-11-20 23:14:57,189 INFO L226 Difference]: Without dead ends: 219 [2021-11-20 23:14:57,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:57,191 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 29 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:57,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 192 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:57,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-20 23:14:57,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 217. [2021-11-20 23:14:57,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.4490740740740742) internal successors, (313), 216 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 313 transitions. [2021-11-20 23:14:57,203 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 313 transitions. Word has length 47 [2021-11-20 23:14:57,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:57,203 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 313 transitions. [2021-11-20 23:14:57,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:57,204 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 313 transitions. [2021-11-20 23:14:57,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 23:14:57,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:57,205 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:57,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 23:14:57,205 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:57,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:57,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1301360374, now seen corresponding path program 1 times [2021-11-20 23:14:57,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:57,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117382544] [2021-11-20 23:14:57,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:57,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:57,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:57,475 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:14:57,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:57,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117382544] [2021-11-20 23:14:57,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117382544] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:57,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626098643] [2021-11-20 23:14:57,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:57,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:57,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:57,478 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:57,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:14:57,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:57,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:14:57,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:57,821 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:14:57,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:58,597 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:14:58,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626098643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:58,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [465002667] [2021-11-20 23:14:58,599 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2021-11-20 23:14:58,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:58,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:58,600 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:58,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:15:33,884 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:15:38,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:15:38,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:15:38,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 8] total 12 [2021-11-20 23:15:38,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951944907] [2021-11-20 23:15:38,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:15:38,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:15:38,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:38,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:15:38,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:15:38,832 INFO L87 Difference]: Start difference. First operand 217 states and 313 transitions. Second operand has 12 states, 12 states have (on average 8.416666666666666) internal successors, (101), 12 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:39,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:39,454 INFO L93 Difference]: Finished difference Result 324 states and 451 transitions. [2021-11-20 23:15:39,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:15:39,454 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 8.416666666666666) internal successors, (101), 12 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-20 23:15:39,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:39,457 INFO L225 Difference]: With dead ends: 324 [2021-11-20 23:15:39,457 INFO L226 Difference]: Without dead ends: 317 [2021-11-20 23:15:39,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=297, Invalid=2153, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:15:39,459 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 482 mSDsluCounter, 1058 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 482 SdHoareTripleChecker+Valid, 1188 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:39,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [482 Valid, 1188 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:15:39,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-20 23:15:39,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 272. [2021-11-20 23:15:39,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 1.4538745387453875) internal successors, (394), 271 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:39,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 394 transitions. [2021-11-20 23:15:39,474 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 394 transitions. Word has length 49 [2021-11-20 23:15:39,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:39,474 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 394 transitions. [2021-11-20 23:15:39,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 8.416666666666666) internal successors, (101), 12 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:39,475 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 394 transitions. [2021-11-20 23:15:39,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 23:15:39,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:39,476 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:39,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:39,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 23:15:39,698 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:39,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:39,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1676014596, now seen corresponding path program 1 times [2021-11-20 23:15:39,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:39,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905872750] [2021-11-20 23:15:39,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:39,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:39,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:39,867 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:39,867 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:39,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905872750] [2021-11-20 23:15:39,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905872750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:15:39,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679825909] [2021-11-20 23:15:39,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:39,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:39,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:39,874 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:39,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:15:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:39,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:15:39,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:40,301 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:40,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:15:40,879 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:40,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679825909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:15:40,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [789521028] [2021-11-20 23:15:40,882 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:15:40,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:15:40,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:15:40,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:15:40,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:16:09,369 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:16:14,129 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:16:14,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:16:14,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2021-11-20 23:16:14,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070029936] [2021-11-20 23:16:14,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:16:14,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:16:14,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:14,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:16:14,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:16:14,132 INFO L87 Difference]: Start difference. First operand 272 states and 394 transitions. Second operand has 12 states, 12 states have (on average 8.333333333333334) internal successors, (100), 12 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:14,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:14,307 INFO L93 Difference]: Finished difference Result 281 states and 399 transitions. [2021-11-20 23:16:14,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:16:14,308 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 8.333333333333334) internal successors, (100), 12 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-20 23:16:14,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:14,310 INFO L225 Difference]: With dead ends: 281 [2021-11-20 23:16:14,310 INFO L226 Difference]: Without dead ends: 278 [2021-11-20 23:16:14,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:16:14,312 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 201 mSDsluCounter, 807 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 929 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:14,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 929 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:16:14,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-11-20 23:16:14,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 272. [2021-11-20 23:16:14,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 1.4391143911439115) internal successors, (390), 271 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:14,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 390 transitions. [2021-11-20 23:16:14,326 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 390 transitions. Word has length 50 [2021-11-20 23:16:14,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:14,326 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 390 transitions. [2021-11-20 23:16:14,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 8.333333333333334) internal successors, (100), 12 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:14,327 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 390 transitions. [2021-11-20 23:16:14,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:16:14,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:14,328 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:16:14,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-20 23:16:14,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:14,550 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:14,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:14,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1374353121, now seen corresponding path program 1 times [2021-11-20 23:16:14,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:14,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241838459] [2021-11-20 23:16:14,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:14,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:14,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:14,977 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:16:14,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:14,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241838459] [2021-11-20 23:16:14,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241838459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:14,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486333832] [2021-11-20 23:16:14,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:14,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:14,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:14,982 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:14,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:16:15,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:15,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:16:15,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:15,535 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:16:15,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:16:16,315 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:16:16,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486333832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:16:16,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113284926] [2021-11-20 23:16:16,318 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:16:16,318 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:16:16,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:16:16,318 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:16:16,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:16:50,667 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:16:55,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:16:55,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:16:55,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 10] total 16 [2021-11-20 23:16:55,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774332575] [2021-11-20 23:16:55,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:16:55,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:16:55,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:55,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:16:55,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2096, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:16:55,720 INFO L87 Difference]: Start difference. First operand 272 states and 390 transitions. Second operand has 16 states, 16 states have (on average 6.75) internal successors, (108), 16 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:55,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:55,987 INFO L93 Difference]: Finished difference Result 282 states and 396 transitions. [2021-11-20 23:16:55,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:16:55,988 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.75) internal successors, (108), 16 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:16:55,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:55,990 INFO L225 Difference]: With dead ends: 282 [2021-11-20 23:16:55,990 INFO L226 Difference]: Without dead ends: 279 [2021-11-20 23:16:55,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=272, Invalid=2278, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:16:55,992 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 269 mSDsluCounter, 1196 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 1339 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:55,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 1339 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:16:55,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-20 23:16:56,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 272. [2021-11-20 23:16:56,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 1.4280442804428044) internal successors, (387), 271 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:56,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 387 transitions. [2021-11-20 23:16:56,007 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 387 transitions. Word has length 56 [2021-11-20 23:16:56,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:56,007 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 387 transitions. [2021-11-20 23:16:56,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.75) internal successors, (108), 16 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:16:56,008 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 387 transitions. [2021-11-20 23:16:56,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-20 23:16:56,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:56,009 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:16:56,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:16:56,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:16:56,230 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:56,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:56,230 INFO L85 PathProgramCache]: Analyzing trace with hash 806051951, now seen corresponding path program 1 times [2021-11-20 23:16:56,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:56,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262079924] [2021-11-20 23:16:56,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:56,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:56,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:56,625 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 14 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:16:56,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:56,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262079924] [2021-11-20 23:16:56,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262079924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:56,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590774408] [2021-11-20 23:16:56,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:56,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:56,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:56,630 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:56,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:16:56,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:56,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:16:56,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:57,371 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 14 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:16:57,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:16:58,273 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 14 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:16:58,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590774408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:16:58,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [17336694] [2021-11-20 23:16:58,276 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:16:58,276 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:16:58,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:16:58,277 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:16:58,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:33,702 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:38,982 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:38,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:38,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10] total 22 [2021-11-20 23:17:38,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402207472] [2021-11-20 23:17:38,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:38,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:17:38,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:38,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:17:38,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2688, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:17:38,987 INFO L87 Difference]: Start difference. First operand 272 states and 387 transitions. Second operand has 22 states, 22 states have (on average 9.181818181818182) internal successors, (202), 22 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:39,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:39,418 INFO L93 Difference]: Finished difference Result 299 states and 423 transitions. [2021-11-20 23:17:39,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:17:39,419 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 9.181818181818182) internal successors, (202), 22 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-20 23:17:39,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:39,422 INFO L225 Difference]: With dead ends: 299 [2021-11-20 23:17:39,422 INFO L226 Difference]: Without dead ends: 294 [2021-11-20 23:17:39,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1116 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=295, Invalid=2897, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:17:39,424 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 404 mSDsluCounter, 1949 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 2140 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:39,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [404 Valid, 2140 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:17:39,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2021-11-20 23:17:39,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2021-11-20 23:17:39,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 291 states have (on average 1.4158075601374571) internal successors, (412), 291 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:39,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 412 transitions. [2021-11-20 23:17:39,443 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 412 transitions. Word has length 77 [2021-11-20 23:17:39,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:39,443 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 412 transitions. [2021-11-20 23:17:39,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 9.181818181818182) internal successors, (202), 22 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:39,444 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 412 transitions. [2021-11-20 23:17:39,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-20 23:17:39,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:39,446 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 9, 9, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:39,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-20 23:17:39,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:17:39,666 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:39,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:39,666 INFO L85 PathProgramCache]: Analyzing trace with hash 1627393088, now seen corresponding path program 1 times [2021-11-20 23:17:39,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:39,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619812724] [2021-11-20 23:17:39,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:39,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:39,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:39,973 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 24 proven. 318 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:17:39,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:39,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619812724] [2021-11-20 23:17:39,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619812724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:39,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741228318] [2021-11-20 23:17:39,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:39,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:39,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:39,978 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:39,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:17:40,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:40,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 23:17:40,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:40,725 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 24 proven. 318 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:17:40,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:42,890 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 28 proven. 330 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:17:42,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741228318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:42,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371002455] [2021-11-20 23:17:42,893 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-20 23:17:42,893 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:42,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:42,894 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:42,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:30,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:36,773 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:36,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:36,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 16] total 23 [2021-11-20 23:18:36,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521604413] [2021-11-20 23:18:36,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:36,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:18:36,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:36,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:18:36,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=2852, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:18:36,777 INFO L87 Difference]: Start difference. First operand 292 states and 412 transitions. Second operand has 23 states, 23 states have (on average 10.304347826086957) internal successors, (237), 23 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:37,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:37,749 INFO L93 Difference]: Finished difference Result 605 states and 858 transitions. [2021-11-20 23:18:37,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:18:37,750 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 10.304347826086957) internal successors, (237), 23 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-20 23:18:37,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:37,755 INFO L225 Difference]: With dead ends: 605 [2021-11-20 23:18:37,755 INFO L226 Difference]: Without dead ends: 587 [2021-11-20 23:18:37,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 361 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1385 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=445, Invalid=3715, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:18:37,759 INFO L933 BasicCegarLoop]: 315 mSDtfsCounter, 1861 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1861 SdHoareTripleChecker+Valid, 3722 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:37,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1861 Valid, 3722 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:18:37,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-11-20 23:18:37,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 550. [2021-11-20 23:18:37,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 550 states, 549 states have (on average 1.4517304189435336) internal successors, (797), 549 states have internal predecessors, (797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:37,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 797 transitions. [2021-11-20 23:18:37,784 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 797 transitions. Word has length 130 [2021-11-20 23:18:37,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:37,785 INFO L470 AbstractCegarLoop]: Abstraction has 550 states and 797 transitions. [2021-11-20 23:18:37,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 10.304347826086957) internal successors, (237), 23 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:37,785 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 797 transitions. [2021-11-20 23:18:37,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-20 23:18:37,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:37,788 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 9, 9, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:37,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:38,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:38,002 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:38,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:38,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1630818142, now seen corresponding path program 1 times [2021-11-20 23:18:38,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:38,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372476094] [2021-11-20 23:18:38,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:38,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:38,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:38,407 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 24 proven. 335 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:18:38,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:38,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372476094] [2021-11-20 23:18:38,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372476094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:38,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868873566] [2021-11-20 23:18:38,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:38,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:38,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:38,420 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:38,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:18:38,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:38,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 885 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-20 23:18:38,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:39,557 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 24 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:18:39,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:44,050 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 24 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:18:44,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868873566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:44,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663183838] [2021-11-20 23:18:44,059 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:18:44,059 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:44,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:44,060 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:44,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:34,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:41,336 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:41,337 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:41,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 21] total 40 [2021-11-20 23:19:41,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900724248] [2021-11-20 23:19:41,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:41,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:19:41,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:41,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:19:41,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=4837, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:19:41,341 INFO L87 Difference]: Start difference. First operand 550 states and 797 transitions. Second operand has 40 states, 40 states have (on average 8.5) internal successors, (340), 40 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:44,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:44,546 INFO L93 Difference]: Finished difference Result 577 states and 818 transitions. [2021-11-20 23:19:44,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:19:44,546 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 8.5) internal successors, (340), 40 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-20 23:19:44,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:44,551 INFO L225 Difference]: With dead ends: 577 [2021-11-20 23:19:44,552 INFO L226 Difference]: Without dead ends: 563 [2021-11-20 23:19:44,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 367 SyntacticMatches, 4 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3215 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=741, Invalid=8379, Unknown=0, NotChecked=0, Total=9120 [2021-11-20 23:19:44,557 INFO L933 BasicCegarLoop]: 312 mSDtfsCounter, 2578 mSDsluCounter, 5218 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2578 SdHoareTripleChecker+Valid, 5530 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:44,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2578 Valid, 5530 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:19:44,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-11-20 23:19:44,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 550. [2021-11-20 23:19:44,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 550 states, 549 states have (on average 1.4116575591985427) internal successors, (775), 549 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:44,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 775 transitions. [2021-11-20 23:19:44,588 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 775 transitions. Word has length 134 [2021-11-20 23:19:44,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:44,589 INFO L470 AbstractCegarLoop]: Abstraction has 550 states and 775 transitions. [2021-11-20 23:19:44,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 8.5) internal successors, (340), 40 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:44,589 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 775 transitions. [2021-11-20 23:19:44,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-20 23:19:44,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:44,592 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 9, 9, 6, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:44,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:44,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:44,806 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:44,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:44,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1759770873, now seen corresponding path program 2 times [2021-11-20 23:19:44,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:44,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603455381] [2021-11-20 23:19:44,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:44,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:45,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:45,658 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 26 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:19:45,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:45,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603455381] [2021-11-20 23:19:45,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603455381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:45,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038285790] [2021-11-20 23:19:45,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:45,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:45,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:45,662 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:45,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:19:45,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:19:45,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:45,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 940 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-20 23:19:45,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:46,877 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 26 proven. 388 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:19:46,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:48,465 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 60 proven. 354 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:19:48,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038285790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:48,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1347675033] [2021-11-20 23:19:48,474 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:19:48,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:48,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:48,477 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:48,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:28,780 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:34,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:34,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:34,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 23] total 47 [2021-11-20 23:20:34,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321974311] [2021-11-20 23:20:34,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:34,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-20 23:20:34,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:34,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-20 23:20:34,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=5525, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:20:34,714 INFO L87 Difference]: Start difference. First operand 550 states and 775 transitions. Second operand has 47 states, 47 states have (on average 8.063829787234043) internal successors, (379), 47 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:37,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:37,963 INFO L93 Difference]: Finished difference Result 678 states and 930 transitions. [2021-11-20 23:20:37,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-20 23:20:37,966 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 8.063829787234043) internal successors, (379), 47 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-20 23:20:37,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:37,971 INFO L225 Difference]: With dead ends: 678 [2021-11-20 23:20:37,971 INFO L226 Difference]: Without dead ends: 676 [2021-11-20 23:20:37,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 390 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5786 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=2282, Invalid=14488, Unknown=0, NotChecked=0, Total=16770 [2021-11-20 23:20:37,978 INFO L933 BasicCegarLoop]: 324 mSDtfsCounter, 2814 mSDsluCounter, 5783 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2814 SdHoareTripleChecker+Valid, 6107 SdHoareTripleChecker+Invalid, 1236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:37,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2814 Valid, 6107 Invalid, 1236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:20:37,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-11-20 23:20:38,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 551. [2021-11-20 23:20:38,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 551 states, 550 states have (on average 1.4054545454545455) internal successors, (773), 550 states have internal predecessors, (773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:38,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 551 states to 551 states and 773 transitions. [2021-11-20 23:20:38,005 INFO L78 Accepts]: Start accepts. Automaton has 551 states and 773 transitions. Word has length 140 [2021-11-20 23:20:38,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:38,006 INFO L470 AbstractCegarLoop]: Abstraction has 551 states and 773 transitions. [2021-11-20 23:20:38,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 8.063829787234043) internal successors, (379), 47 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:38,007 INFO L276 IsEmpty]: Start isEmpty. Operand 551 states and 773 transitions. [2021-11-20 23:20:38,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2021-11-20 23:20:38,012 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:38,012 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 19, 19, 12, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:38,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:38,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:38,234 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:38,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:38,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1845482108, now seen corresponding path program 1 times [2021-11-20 23:20:38,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:38,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677486093] [2021-11-20 23:20:38,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:38,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:38,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:39,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 52 proven. 1707 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-20 23:20:39,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:39,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677486093] [2021-11-20 23:20:39,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677486093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:39,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711756311] [2021-11-20 23:20:39,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:39,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:39,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:39,106 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:39,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:20:39,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:39,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 1796 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-20 23:20:39,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:41,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 52 proven. 1755 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:41,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:54,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 52 proven. 1755 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:54,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711756311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:54,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474317226] [2021-11-20 23:20:54,424 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:20:54,424 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:54,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:54,425 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:54,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:39,751 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:47,618 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:47,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:47,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 28, 42] total 84 [2021-11-20 23:21:47,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160097228] [2021-11-20 23:21:47,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:47,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-20 23:21:47,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:47,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-20 23:21:47,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=686, Invalid=12886, Unknown=0, NotChecked=0, Total=13572 [2021-11-20 23:21:47,622 INFO L87 Difference]: Start difference. First operand 551 states and 773 transitions. Second operand has 84 states, 84 states have (on average 9.226190476190476) internal successors, (775), 84 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:54,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:54,697 INFO L93 Difference]: Finished difference Result 1257 states and 1766 transitions. [2021-11-20 23:21:54,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 23:21:54,698 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 9.226190476190476) internal successors, (775), 84 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 275 [2021-11-20 23:21:54,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:54,704 INFO L225 Difference]: With dead ends: 1257 [2021-11-20 23:21:54,705 INFO L226 Difference]: Without dead ends: 1231 [2021-11-20 23:21:54,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 942 GetRequests, 785 SyntacticMatches, 5 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8486 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=1270, Invalid=22292, Unknown=0, NotChecked=0, Total=23562 [2021-11-20 23:21:54,708 INFO L933 BasicCegarLoop]: 879 mSDtfsCounter, 7088 mSDsluCounter, 39206 mSDsCounter, 0 mSdLazyCounter, 4301 mSolverCounterSat, 520 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7088 SdHoareTripleChecker+Valid, 40085 SdHoareTripleChecker+Invalid, 4821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 520 IncrementalHoareTripleChecker+Valid, 4301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:54,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7088 Valid, 40085 Invalid, 4821 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [520 Valid, 4301 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-20 23:21:54,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1231 states. [2021-11-20 23:21:54,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1231 to 1126. [2021-11-20 23:21:54,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1125 states have (on average 1.456) internal successors, (1638), 1125 states have internal predecessors, (1638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:54,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1638 transitions. [2021-11-20 23:21:54,756 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1638 transitions. Word has length 275 [2021-11-20 23:21:54,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:54,757 INFO L470 AbstractCegarLoop]: Abstraction has 1126 states and 1638 transitions. [2021-11-20 23:21:54,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 9.226190476190476) internal successors, (775), 84 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:54,758 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1638 transitions. [2021-11-20 23:21:54,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2021-11-20 23:21:54,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:54,763 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 20, 20, 13, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:54,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:54,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-20 23:21:54,982 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:54,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:54,983 INFO L85 PathProgramCache]: Analyzing trace with hash -404638832, now seen corresponding path program 2 times [2021-11-20 23:21:54,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:54,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442266031] [2021-11-20 23:21:54,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:54,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:56,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:56,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1973 backedges. 54 proven. 1871 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-20 23:21:56,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:56,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442266031] [2021-11-20 23:21:56,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442266031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:56,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821558358] [2021-11-20 23:21:56,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:56,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:56,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:56,846 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:56,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:21:57,531 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-20 23:21:57,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:57,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 1866 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-20 23:21:57,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:59,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1973 backedges. 54 proven. 1871 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-20 23:21:59,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1973 backedges. 90 proven. 1871 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:22:11,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821558358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:11,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [610413962] [2021-11-20 23:22:11,550 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:22:11,551 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:11,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:11,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:11,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:02,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:09,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:09,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:09,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 32] total 49 [2021-11-20 23:23:09,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400856035] [2021-11-20 23:23:09,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:09,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:23:09,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:09,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:23:09,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=724, Invalid=5918, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:23:09,300 INFO L87 Difference]: Start difference. First operand 1126 states and 1638 transitions. Second operand has 49 states, 49 states have (on average 11.081632653061224) internal successors, (543), 49 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:18,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:18,894 INFO L93 Difference]: Finished difference Result 1250 states and 1732 transitions. [2021-11-20 23:23:18,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-20 23:23:18,896 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 11.081632653061224) internal successors, (543), 49 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 287 [2021-11-20 23:23:18,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:18,904 INFO L225 Difference]: With dead ends: 1250 [2021-11-20 23:23:18,904 INFO L226 Difference]: Without dead ends: 1232 [2021-11-20 23:23:18,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1025 GetRequests, 862 SyntacticMatches, 4 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8349 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=3217, Invalid=22543, Unknown=0, NotChecked=0, Total=25760 [2021-11-20 23:23:18,909 INFO L933 BasicCegarLoop]: 666 mSDtfsCounter, 11077 mSDsluCounter, 11706 mSDsCounter, 0 mSdLazyCounter, 1558 mSolverCounterSat, 784 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11077 SdHoareTripleChecker+Valid, 12372 SdHoareTripleChecker+Invalid, 2342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 784 IncrementalHoareTripleChecker+Valid, 1558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:18,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11077 Valid, 12372 Invalid, 2342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [784 Valid, 1558 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-20 23:23:18,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1232 states. [2021-11-20 23:23:18,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1232 to 1126. [2021-11-20 23:23:18,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1125 states have (on average 1.431111111111111) internal successors, (1610), 1125 states have internal predecessors, (1610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:18,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1610 transitions. [2021-11-20 23:23:18,961 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1610 transitions. Word has length 287 [2021-11-20 23:23:18,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:18,962 INFO L470 AbstractCegarLoop]: Abstraction has 1126 states and 1610 transitions. [2021-11-20 23:23:18,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 11.081632653061224) internal successors, (543), 49 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:18,962 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1610 transitions. [2021-11-20 23:23:18,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-11-20 23:23:18,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:18,969 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 21, 21, 14, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:19,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:19,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:19,186 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:19,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:19,187 INFO L85 PathProgramCache]: Analyzing trace with hash 765225555, now seen corresponding path program 3 times [2021-11-20 23:23:19,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:19,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386492019] [2021-11-20 23:23:19,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:19,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:19,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:20,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 58 proven. 2164 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-20 23:23:20,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:20,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386492019] [2021-11-20 23:23:20,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386492019] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:20,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914290277] [2021-11-20 23:23:20,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:20,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:20,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:20,889 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:20,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45d304b8-168d-4267-a949-63133eb46882/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:23:21,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:23:21,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:21,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 2000 conjuncts, 148 conjunts are in the unsatisfiable core [2021-11-20 23:23:21,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:23,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 58 proven. 2212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:23,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:40,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 58 proven. 2212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:40,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914290277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:40,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1216270077] [2021-11-20 23:23:40,780 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-20 23:23:40,780 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:40,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:40,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:40,781 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs