./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const5.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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/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 e6c0909fc593366247feb227b85c6733aa1dfc9c572e69f3a5aa951fa82d0326 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:11:57,790 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:11:57,792 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:11:57,844 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:11:57,845 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:11:57,847 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:11:57,850 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:11:57,852 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:11:57,855 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:11:57,857 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:11:57,858 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:11:57,860 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:11:57,861 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:11:57,863 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:11:57,865 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:11:57,867 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:11:57,869 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:11:57,870 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:11:57,873 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:11:57,877 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:11:57,879 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:11:57,881 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:11:57,885 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:11:57,888 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:11:57,894 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:11:57,902 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:11:57,902 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:11:57,904 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:11:57,906 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:11:57,908 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:11:57,909 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:11:57,910 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:11:57,913 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:11:57,915 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:11:57,917 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:11:57,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:11:57,918 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:11:57,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:11:57,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:11:57,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:11:57,924 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:11:57,925 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:11:57,983 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:11:57,983 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:11:57,984 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:11:57,984 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:11:57,986 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:11:57,986 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:11:57,986 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:11:57,987 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:11:57,987 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:11:57,987 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:11:57,988 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:11:57,989 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:11:57,989 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:11:57,989 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:11:57,990 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:11:57,990 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:11:57,990 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:11:57,991 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:11:57,992 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:11:57,992 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:11:57,992 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:11:57,992 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:11:57,993 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:11:57,993 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:11:57,993 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:11:57,993 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:11:57,995 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:11:57,996 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:11:57,996 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:11:57,996 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:11:57,997 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:11:57,997 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:11:57,997 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:11:57,998 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:11:57,998 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:11:57,998 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:11:57,999 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:11:57,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:11:57,999 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:11:57,999 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:11:58,000 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:11:58,000 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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e6c0909fc593366247feb227b85c6733aa1dfc9c572e69f3a5aa951fa82d0326 [2021-11-21 01:11:58,348 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:11:58,384 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:11:58,387 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:11:58,389 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:11:58,390 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:11:58,391 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-crafted/zero_sum_const5.c [2021-11-21 01:11:58,502 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/data/8d6a5f62f/f02d48f580854f3ba2053bdc2251916f/FLAG666d975b5 [2021-11-21 01:11:59,174 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:11:59,179 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/sv-benchmarks/c/array-crafted/zero_sum_const5.c [2021-11-21 01:11:59,193 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/data/8d6a5f62f/f02d48f580854f3ba2053bdc2251916f/FLAG666d975b5 [2021-11-21 01:11:59,497 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/data/8d6a5f62f/f02d48f580854f3ba2053bdc2251916f [2021-11-21 01:11:59,510 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:11:59,514 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:11:59,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:11:59,520 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:11:59,524 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:11:59,525 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:11:59,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23655802 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59, skipping insertion in model container [2021-11-21 01:11:59,529 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:11:59,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:11:59,567 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:11:59,758 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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/sv-benchmarks/c/array-crafted/zero_sum_const5.c[406,419] [2021-11-21 01:11:59,821 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:11:59,834 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:11:59,854 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_a07bb1e9-a806-4fa9-bb44-0eafa688334d/sv-benchmarks/c/array-crafted/zero_sum_const5.c[406,419] [2021-11-21 01:11:59,884 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:11:59,915 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:11:59,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59 WrapperNode [2021-11-21 01:11:59,916 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:11:59,917 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:11:59,917 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:11:59,918 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:11:59,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:11:59,951 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:11:59,995 INFO L137 Inliner]: procedures = 16, calls = 20, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 148 [2021-11-21 01:11:59,995 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:11:59,996 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:11:59,996 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:11:59,996 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:12:00,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,010 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,017 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,024 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,026 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,030 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:12:00,031 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:12:00,031 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:12:00,031 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:12:00,032 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (1/1) ... [2021-11-21 01:12:00,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:12:00,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:00,071 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:12:00,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:12:00,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:12:00,130 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:12:00,130 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:12:00,130 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 01:12:00,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:12:00,131 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:12:00,131 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:12:00,281 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:12:00,283 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:12:00,675 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:12:00,756 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:12:00,757 INFO L301 CfgBuilder]: Removed 11 assume(true) statements. [2021-11-21 01:12:00,760 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:12:00 BoogieIcfgContainer [2021-11-21 01:12:00,760 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:12:00,762 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:12:00,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:12:00,773 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:12:00,774 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:11:59" (1/3) ... [2021-11-21 01:12:00,775 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63d4fb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:12:00, skipping insertion in model container [2021-11-21 01:12:00,776 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:11:59" (2/3) ... [2021-11-21 01:12:00,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63d4fb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:12:00, skipping insertion in model container [2021-11-21 01:12:00,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:12:00" (3/3) ... [2021-11-21 01:12:00,779 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const5.c [2021-11-21 01:12:00,786 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:12:00,786 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:12:00,867 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:12:00,883 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:12:00,883 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:12:00,910 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 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) [2021-11-21 01:12:00,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 01:12:00,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:00,926 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:00,927 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:00,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:00,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1027713576, now seen corresponding path program 1 times [2021-11-21 01:12:00,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:00,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472296711] [2021-11-21 01:12:00,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:00,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:01,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:01,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:01,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:01,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472296711] [2021-11-21 01:12:01,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472296711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:12:01,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:12:01,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:12:01,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801660195] [2021-11-21 01:12:01,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:12:01,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:12:01,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:01,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:12:01,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:12:01,294 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 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) 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) [2021-11-21 01:12:01,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:01,415 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2021-11-21 01:12:01,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:12:01,418 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 [2021-11-21 01:12:01,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:01,427 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:12:01,428 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:12:01,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:12:01,438 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:01,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:12:01,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:12:01,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:12:01,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:01,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2021-11-21 01:12:01,495 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2021-11-21 01:12:01,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:01,496 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2021-11-21 01:12:01,496 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) [2021-11-21 01:12:01,498 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2021-11-21 01:12:01,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:12:01,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:01,499 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:01,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:12:01,499 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:01,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:01,500 INFO L85 PathProgramCache]: Analyzing trace with hash -175169423, now seen corresponding path program 1 times [2021-11-21 01:12:01,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:01,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203306146] [2021-11-21 01:12:01,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:01,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:01,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:01,567 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:12:01,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:01,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203306146] [2021-11-21 01:12:01,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203306146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:12:01,569 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:12:01,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:12:01,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060350804] [2021-11-21 01:12:01,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:12:01,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:12:01,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:01,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:12:01,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:12:01,573 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:01,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:01,665 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2021-11-21 01:12:01,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:12:01,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 01:12:01,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:01,668 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:12:01,668 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:12:01,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:12:01,671 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:01,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 5 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:12:01,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:12:01,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 01:12:01,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:01,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-21 01:12:01,683 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2021-11-21 01:12:01,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:01,683 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-21 01:12:01,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:01,684 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-21 01:12:01,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:12:01,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:01,685 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:12:01,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:12:01,686 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:01,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:01,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1945243936, now seen corresponding path program 1 times [2021-11-21 01:12:01,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:01,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242223712] [2021-11-21 01:12:01,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:01,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:01,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:01,827 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:12:01,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:01,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242223712] [2021-11-21 01:12:01,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242223712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:01,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21078060] [2021-11-21 01:12:01,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:01,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:01,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:01,832 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:01,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:12:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:01,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:12:01,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:02,078 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:12:02,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:02,226 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:12:02,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21078060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:02,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [981284191] [2021-11-21 01:12:02,278 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:02,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:02,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:02,293 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:02,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:02,518 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:02,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:02,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:02,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:12:02,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:02,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:12:02,997 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:12:02,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:12:03,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:05,744 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:05,947 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:05,947 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:05,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 01:12:05,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034086371] [2021-11-21 01:12:05,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:05,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:12:05,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:05,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:12:05,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:12:05,951 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 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) [2021-11-21 01:12:06,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:06,039 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2021-11-21 01:12:06,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:12:06,040 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 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 26 [2021-11-21 01:12:06,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:06,041 INFO L225 Difference]: With dead ends: 51 [2021-11-21 01:12:06,041 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:12:06,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:12:06,043 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:06,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:12:06,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:12:06,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 01:12:06,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:06,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-21 01:12:06,052 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2021-11-21 01:12:06,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:06,052 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-21 01:12:06,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 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) [2021-11-21 01:12:06,053 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-21 01:12:06,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:12:06,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:06,055 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:12:06,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:06,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:06,283 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:06,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:06,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1518149385, now seen corresponding path program 2 times [2021-11-21 01:12:06,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:06,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487001125] [2021-11-21 01:12:06,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:06,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:06,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:06,367 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:12:06,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:06,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487001125] [2021-11-21 01:12:06,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487001125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:06,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874645979] [2021-11-21 01:12:06,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:12:06,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:06,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:06,382 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:06,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:12:06,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:12:06,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:06,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:12:06,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:06,545 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:12:06,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:06,660 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:12:06,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874645979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:06,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265191101] [2021-11-21 01:12:06,680 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:06,681 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:06,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:06,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:06,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:06,862 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:06,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:06,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:07,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:12:07,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:07,160 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:12:07,190 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:12:07,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:12:07,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:09,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:10,006 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:10,006 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:10,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-21 01:12:10,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077225130] [2021-11-21 01:12:10,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:10,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:12:10,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:10,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:12:10,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:12:10,009 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:10,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:10,160 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2021-11-21 01:12:10,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:12:10,160 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-21 01:12:10,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:10,162 INFO L225 Difference]: With dead ends: 59 [2021-11-21 01:12:10,162 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 01:12:10,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:12:10,165 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:10,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 9 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:12:10,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 01:12:10,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-21 01:12:10,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:10,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2021-11-21 01:12:10,175 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2021-11-21 01:12:10,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:10,176 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2021-11-21 01:12:10,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:10,176 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2021-11-21 01:12:10,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:12:10,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:10,177 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:12:10,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 01:12:10,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:10,404 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:10,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:10,404 INFO L85 PathProgramCache]: Analyzing trace with hash 2074405160, now seen corresponding path program 3 times [2021-11-21 01:12:10,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:10,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463326459] [2021-11-21 01:12:10,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:10,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:10,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:12,101 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:12,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:12,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463326459] [2021-11-21 01:12:12,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463326459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:12,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868216573] [2021-11-21 01:12:12,103 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:12:12,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:12,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:12,104 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:12,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:12:12,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:12:12,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:12,197 WARN L261 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-21 01:12:12,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:12,809 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:12:12,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:13,355 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-21 01:12:13,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2021-11-21 01:12:13,475 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-21 01:12:13,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2021-11-21 01:12:13,536 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:12:13,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868216573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:13,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635381388] [2021-11-21 01:12:13,541 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:13,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:13,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:13,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:13,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:13,689 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:13,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:13,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:13,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:12:13,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:13,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:13,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:14,005 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:12:14,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 234 treesize of output 231 [2021-11-21 01:12:14,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:16,219 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:16,519 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:16,519 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:16,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 25 [2021-11-21 01:12:16,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205054929] [2021-11-21 01:12:16,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:16,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:12:16,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:16,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:12:16,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=772, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:12:16,523 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 25 states, 25 states have (on average 4.12) internal successors, (103), 25 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:17,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:17,062 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2021-11-21 01:12:17,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:12:17,063 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.12) internal successors, (103), 25 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-21 01:12:17,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:17,065 INFO L225 Difference]: With dead ends: 69 [2021-11-21 01:12:17,065 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 01:12:17,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 103 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:12:17,067 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 590 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:17,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 27 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 590 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:12:17,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 01:12:17,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2021-11-21 01:12:17,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:17,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2021-11-21 01:12:17,081 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2021-11-21 01:12:17,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:17,082 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2021-11-21 01:12:17,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 4.12) internal successors, (103), 25 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:17,082 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2021-11-21 01:12:17,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:12:17,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:17,085 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-21 01:12:17,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:17,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:17,285 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:17,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:17,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1891144796, now seen corresponding path program 4 times [2021-11-21 01:12:17,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:17,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357502319] [2021-11-21 01:12:17,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:17,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:17,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:17,376 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:12:17,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:17,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357502319] [2021-11-21 01:12:17,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357502319] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:17,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643941235] [2021-11-21 01:12:17,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:12:17,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:17,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:17,391 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:17,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:12:17,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:17,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:12:17,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:17,609 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:12:17,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:17,722 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:12:17,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643941235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:17,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615121341] [2021-11-21 01:12:17,726 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:17,726 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:17,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:17,727 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:17,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:17,881 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:17,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:17,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:18,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:12:18,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:18,128 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:12:18,151 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:12:18,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:12:18,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:20,197 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:20,392 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:20,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:20,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-21 01:12:20,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396821944] [2021-11-21 01:12:20,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:20,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:12:20,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:20,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:12:20,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:12:20,394 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:20,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:20,788 INFO L93 Difference]: Finished difference Result 140 states and 185 transitions. [2021-11-21 01:12:20,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:12:20,789 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 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 38 [2021-11-21 01:12:20,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:20,790 INFO L225 Difference]: With dead ends: 140 [2021-11-21 01:12:20,790 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 01:12:20,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:12:20,792 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 298 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 298 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:20,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 13 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [298 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:12:20,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 01:12:20,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2021-11-21 01:12:20,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.267605633802817) internal successors, (90), 71 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:20,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 90 transitions. [2021-11-21 01:12:20,805 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 90 transitions. Word has length 38 [2021-11-21 01:12:20,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:20,806 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 90 transitions. [2021-11-21 01:12:20,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:20,806 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 90 transitions. [2021-11-21 01:12:20,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 01:12:20,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:20,808 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:20,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:21,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:21,025 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:21,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:21,026 INFO L85 PathProgramCache]: Analyzing trace with hash -369878072, now seen corresponding path program 5 times [2021-11-21 01:12:21,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:21,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803408626] [2021-11-21 01:12:21,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:21,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:21,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:12:21,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:21,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803408626] [2021-11-21 01:12:21,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803408626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:21,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438557778] [2021-11-21 01:12:21,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:12:21,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:21,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:21,134 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:21,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:12:21,216 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:12:21,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:21,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:12:21,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:12:21,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:21,537 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:12:21,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438557778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:21,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1160160378] [2021-11-21 01:12:21,541 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:21,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:21,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:21,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:21,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:21,675 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:12:21,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:12:21,760 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:21,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:21,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:12:22,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:22,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:22,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:22,056 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:12:22,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:12:22,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:24,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:24,211 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:24,211 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:24,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-21 01:12:24,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260049185] [2021-11-21 01:12:24,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:24,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:12:24,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:24,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:12:24,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:12:24,213 INFO L87 Difference]: Start difference. First operand 72 states and 90 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:24,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:24,487 INFO L93 Difference]: Finished difference Result 76 states and 94 transitions. [2021-11-21 01:12:24,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:12:24,487 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 01:12:24,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:24,488 INFO L225 Difference]: With dead ends: 76 [2021-11-21 01:12:24,488 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 01:12:24,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:12:24,490 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:24,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 9 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:12:24,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 01:12:24,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-21 01:12:24,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:24,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-11-21 01:12:24,499 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2021-11-21 01:12:24,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:24,502 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-11-21 01:12:24,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:24,502 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-11-21 01:12:24,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-21 01:12:24,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:24,504 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:24,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 01:12:24,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:24,730 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:24,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:24,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1338966432, now seen corresponding path program 6 times [2021-11-21 01:12:24,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:24,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554895716] [2021-11-21 01:12:24,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:24,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:25,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:28,260 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:28,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:28,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554895716] [2021-11-21 01:12:28,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554895716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:28,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346203957] [2021-11-21 01:12:28,261 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:12:28,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:28,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:28,262 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:28,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:12:28,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:12:28,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:28,347 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-21 01:12:28,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:29,742 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:12:29,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:30,713 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-21 01:12:30,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-21 01:12:30,987 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-21 01:12:30,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-21 01:12:31,082 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:12:31,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346203957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:31,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198827391] [2021-11-21 01:12:31,086 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:31,086 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:31,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:31,087 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:31,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:31,194 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:31,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:31,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:31,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:12:31,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:31,468 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:12:31,490 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:12:31,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:12:31,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:33,450 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:33,869 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:33,869 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:33,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 13, 12] total 50 [2021-11-21 01:12:33,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887336819] [2021-11-21 01:12:33,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:33,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-21 01:12:33,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:33,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-21 01:12:33,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=2782, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:12:33,873 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 50 states, 50 states have (on average 2.68) internal successors, (134), 50 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:36,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:36,964 INFO L93 Difference]: Finished difference Result 101 states and 128 transitions. [2021-11-21 01:12:36,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:12:36,964 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.68) internal successors, (134), 50 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-21 01:12:36,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:36,966 INFO L225 Difference]: With dead ends: 101 [2021-11-21 01:12:36,966 INFO L226 Difference]: Without dead ends: 98 [2021-11-21 01:12:36,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 113 SyntacticMatches, 23 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=369, Invalid=4743, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 01:12:36,969 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 1698 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 1883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 1698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:36,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 1883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 1698 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-21 01:12:36,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-21 01:12:36,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 83. [2021-11-21 01:12:36,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.2439024390243902) internal successors, (102), 82 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:36,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 102 transitions. [2021-11-21 01:12:36,986 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 102 transitions. Word has length 48 [2021-11-21 01:12:36,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:36,986 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 102 transitions. [2021-11-21 01:12:36,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.68) internal successors, (134), 50 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:36,987 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 102 transitions. [2021-11-21 01:12:36,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 01:12:36,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:36,989 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:37,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:37,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:12:37,195 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:37,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:37,195 INFO L85 PathProgramCache]: Analyzing trace with hash -1028902748, now seen corresponding path program 7 times [2021-11-21 01:12:37,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:37,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637583421] [2021-11-21 01:12:37,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:37,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:37,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:37,330 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 01:12:37,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:37,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637583421] [2021-11-21 01:12:37,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637583421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:37,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231748014] [2021-11-21 01:12:37,332 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:12:37,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:37,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:37,333 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:37,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:12:37,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:37,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:12:37,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:37,611 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 01:12:37,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:37,727 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 01:12:37,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231748014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:37,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366673639] [2021-11-21 01:12:37,730 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:37,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:37,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:37,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:37,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:37,829 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:12:37,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:12:37,929 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:37,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:38,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:12:38,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:38,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:38,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:38,164 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:12:38,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:12:38,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:40,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:40,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:40,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:40,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:12:40,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937151452] [2021-11-21 01:12:40,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:40,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:12:40,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:40,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:12:40,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:12:40,408 INFO L87 Difference]: Start difference. First operand 83 states and 102 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:40,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:40,821 INFO L93 Difference]: Finished difference Result 178 states and 223 transitions. [2021-11-21 01:12:40,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:12:40,822 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 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 49 [2021-11-21 01:12:40,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:40,823 INFO L225 Difference]: With dead ends: 178 [2021-11-21 01:12:40,824 INFO L226 Difference]: Without dead ends: 98 [2021-11-21 01:12:40,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:12:40,826 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:40,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:12:40,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-21 01:12:40,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 91. [2021-11-21 01:12:40,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.211111111111111) internal successors, (109), 90 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:40,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2021-11-21 01:12:40,853 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 49 [2021-11-21 01:12:40,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:40,854 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2021-11-21 01:12:40,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:40,854 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2021-11-21 01:12:40,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:12:40,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:40,856 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:40,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:41,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:12:41,083 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:41,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:41,083 INFO L85 PathProgramCache]: Analyzing trace with hash -1956775232, now seen corresponding path program 8 times [2021-11-21 01:12:41,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:41,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944945768] [2021-11-21 01:12:41,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:41,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:41,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:41,195 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:12:41,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:41,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944945768] [2021-11-21 01:12:41,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944945768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:41,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649971607] [2021-11-21 01:12:41,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:12:41,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:41,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:41,198 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:41,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:12:41,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:12:41,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:41,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:12:41,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:41,474 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:12:41,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:41,626 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:12:41,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649971607] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:41,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133582023] [2021-11-21 01:12:41,629 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:41,630 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:41,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:41,630 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:41,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:41,729 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:12:41,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:12:41,854 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:41,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:41,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:41,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:12:42,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:42,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:42,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:42,069 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:12:42,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:12:42,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:44,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:44,224 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:44,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:44,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:12:44,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484823313] [2021-11-21 01:12:44,225 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:44,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:12:44,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:44,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:12:44,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:12:44,227 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:44,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:44,568 INFO L93 Difference]: Finished difference Result 95 states and 113 transitions. [2021-11-21 01:12:44,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:12:44,568 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-21 01:12:44,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:44,570 INFO L225 Difference]: With dead ends: 95 [2021-11-21 01:12:44,570 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 01:12:44,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=146, Invalid=610, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:12:44,572 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:44,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 11 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:12:44,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 01:12:44,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-21 01:12:44,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:44,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-11-21 01:12:44,585 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 50 [2021-11-21 01:12:44,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:44,585 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-11-21 01:12:44,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:44,586 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-11-21 01:12:44,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 01:12:44,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:44,587 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:12:44,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-21 01:12:44,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:44,801 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:44,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:44,801 INFO L85 PathProgramCache]: Analyzing trace with hash 140199976, now seen corresponding path program 9 times [2021-11-21 01:12:44,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:44,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182385763] [2021-11-21 01:12:44,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:44,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:45,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:49,559 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 2 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:49,559 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:49,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182385763] [2021-11-21 01:12:49,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182385763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:49,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338118898] [2021-11-21 01:12:49,560 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:12:49,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:49,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:49,561 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:49,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:12:49,642 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:12:49,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:49,647 WARN L261 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 175 conjunts are in the unsatisfiable core [2021-11-21 01:12:49,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:51,380 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:12:51,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:52,735 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-21 01:12:52,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2021-11-21 01:12:53,502 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-21 01:12:53,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2021-11-21 01:12:53,596 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:12:53,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338118898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:53,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544221443] [2021-11-21 01:12:53,598 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:12:53,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:53,599 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:53,599 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:53,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:53,713 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:12:53,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:12:53,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:12:53,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:53,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:12:53,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:53,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:53,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:12:53,970 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:12:53,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 234 treesize of output 231 [2021-11-21 01:12:54,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:12:56,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:56,518 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:56,518 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:56,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 16, 14] total 63 [2021-11-21 01:12:56,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156119806] [2021-11-21 01:12:56,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:56,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-21 01:12:56,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:56,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-21 01:12:56,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4309, Unknown=0, NotChecked=0, Total=4556 [2021-11-21 01:12:56,523 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 63 states, 63 states have (on average 2.634920634920635) internal successors, (166), 63 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:05,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:05,853 INFO L93 Difference]: Finished difference Result 174 states and 217 transitions. [2021-11-21 01:13:05,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 01:13:05,854 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.634920634920635) internal successors, (166), 63 states have internal predecessors, (166), 0 states have call successors, (0), 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 59 [2021-11-21 01:13:05,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:05,855 INFO L225 Difference]: With dead ends: 174 [2021-11-21 01:13:05,855 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 01:13:05,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 141 SyntacticMatches, 26 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1021, Invalid=9281, Unknown=0, NotChecked=0, Total=10302 [2021-11-21 01:13:05,860 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 227 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 3686 mSolverCounterSat, 1521 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 5207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1521 IncrementalHoareTripleChecker+Valid, 3686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:05,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 53 Invalid, 5207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1521 Valid, 3686 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-21 01:13:05,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 01:13:05,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 62. [2021-11-21 01:13:05,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 61 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:05,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 73 transitions. [2021-11-21 01:13:05,881 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 73 transitions. Word has length 59 [2021-11-21 01:13:05,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:05,882 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 73 transitions. [2021-11-21 01:13:05,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.634920634920635) internal successors, (166), 63 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:05,883 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 73 transitions. [2021-11-21 01:13:05,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:13:05,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:05,884 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:05,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:06,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:06,106 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:06,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:06,107 INFO L85 PathProgramCache]: Analyzing trace with hash 722949724, now seen corresponding path program 10 times [2021-11-21 01:13:06,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:06,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996646704] [2021-11-21 01:13:06,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:06,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:06,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:06,266 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:13:06,267 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:06,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996646704] [2021-11-21 01:13:06,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996646704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:06,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495230411] [2021-11-21 01:13:06,268 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:13:06,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:06,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:06,269 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:06,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:13:06,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:06,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:13:06,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:06,631 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:13:06,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:13:06,779 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:13:06,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495230411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:13:06,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919217500] [2021-11-21 01:13:06,786 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:13:06,787 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:13:06,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:13:06,789 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:13:06,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:13:06,889 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:13:06,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:13:06,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:13:07,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:13:07,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:07,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:07,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:07,181 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:13:07,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 234 treesize of output 231 [2021-11-21 01:13:07,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:13:09,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:13:09,518 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:13:09,518 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:13:09,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-21 01:13:09,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137824121] [2021-11-21 01:13:09,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:13:09,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:13:09,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:13:09,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:13:09,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:13:09,520 INFO L87 Difference]: Start difference. First operand 62 states and 73 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:09,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:09,943 INFO L93 Difference]: Finished difference Result 175 states and 214 transitions. [2021-11-21 01:13:09,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:13:09,943 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-21 01:13:09,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:09,944 INFO L225 Difference]: With dead ends: 175 [2021-11-21 01:13:09,944 INFO L226 Difference]: Without dead ends: 74 [2021-11-21 01:13:09,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:13:09,948 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:09,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 15 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:13:09,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-21 01:13:09,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 70. [2021-11-21 01:13:09,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1594202898550725) internal successors, (80), 69 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:09,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 80 transitions. [2021-11-21 01:13:09,970 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 80 transitions. Word has length 60 [2021-11-21 01:13:09,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:09,971 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 80 transitions. [2021-11-21 01:13:09,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:09,971 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 80 transitions. [2021-11-21 01:13:09,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 01:13:09,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:09,973 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:10,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:10,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:13:10,195 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:10,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:10,195 INFO L85 PathProgramCache]: Analyzing trace with hash -1470725045, now seen corresponding path program 11 times [2021-11-21 01:13:10,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:10,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880118046] [2021-11-21 01:13:10,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:10,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:10,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:10,361 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 01:13:10,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:10,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880118046] [2021-11-21 01:13:10,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880118046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:10,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75274561] [2021-11-21 01:13:10,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:13:10,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:10,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:10,364 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:10,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:13:10,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:13:10,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:13:10,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:13:10,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:10,791 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 01:13:10,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:13:10,993 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 01:13:10,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75274561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:13:10,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071912984] [2021-11-21 01:13:10,996 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:13:10,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:13:10,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:13:10,997 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:13:10,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:13:11,102 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:13:11,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:13:11,210 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:13:11,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:13:11,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:13:11,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:11,445 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:13:11,469 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:13:11,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 233 treesize of output 236 [2021-11-21 01:13:11,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:13:13,352 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:13:13,539 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:13:13,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:13:13,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-21 01:13:13,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177311551] [2021-11-21 01:13:13,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:13:13,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:13:13,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:13:13,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:13:13,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:13:13,541 INFO L87 Difference]: Start difference. First operand 70 states and 80 transitions. Second operand has 20 states, 20 states have (on average 2.55) internal successors, (51), 20 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:13,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:13,916 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2021-11-21 01:13:13,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:13:13,916 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 20 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-21 01:13:13,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:13,917 INFO L225 Difference]: With dead ends: 74 [2021-11-21 01:13:13,917 INFO L226 Difference]: Without dead ends: 71 [2021-11-21 01:13:13,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 198 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:13:13,918 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:13,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:13:13,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-21 01:13:13,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-21 01:13:13,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 70 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:13,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2021-11-21 01:13:13,934 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 69 [2021-11-21 01:13:13,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:13,934 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2021-11-21 01:13:13,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 20 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:13,935 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2021-11-21 01:13:13,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-21 01:13:13,935 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:13,936 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:13,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:14,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:13:14,136 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:14,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:14,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1651584480, now seen corresponding path program 12 times [2021-11-21 01:13:14,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:14,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933371942] [2021-11-21 01:13:14,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:14,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:14,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:20,730 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 5 proven. 160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:13:20,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:20,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933371942] [2021-11-21 01:13:20,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933371942] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:20,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448116941] [2021-11-21 01:13:20,731 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:13:20,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:20,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:20,732 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:20,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:13:20,830 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:13:20,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:13:20,836 WARN L261 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-21 01:13:20,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:23,815 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:13:23,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:13:25,936 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-21 01:13:25,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2021-11-21 01:13:27,867 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-21 01:13:27,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2021-11-21 01:13:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:13:27,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448116941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:13:27,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543353340] [2021-11-21 01:13:27,987 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:13:27,987 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:13:27,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:13:27,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:13:27,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:13:28,125 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:13:28,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:13:28,208 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:13:28,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:13:28,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:13:28,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:28,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:13:28,414 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:13:28,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 233 treesize of output 236 [2021-11-21 01:13:28,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:13:30,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:13:30,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:13:30,995 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:13:30,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 19, 16] total 80 [2021-11-21 01:13:30,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789158989] [2021-11-21 01:13:30,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:13:30,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-21 01:13:30,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:13:30,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-21 01:13:30,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=6784, Unknown=0, NotChecked=0, Total=7140 [2021-11-21 01:13:31,000 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 80 states, 80 states have (on average 2.475) internal successors, (198), 80 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:41,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:41,356 INFO L93 Difference]: Finished difference Result 278 states and 326 transitions. [2021-11-21 01:13:41,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-21 01:13:41,357 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.475) internal successors, (198), 80 states have internal predecessors, (198), 0 states have call successors, (0), 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 70 [2021-11-21 01:13:41,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:41,358 INFO L225 Difference]: With dead ends: 278 [2021-11-21 01:13:41,358 INFO L226 Difference]: Without dead ends: 159 [2021-11-21 01:13:41,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 161 SyntacticMatches, 33 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5119 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=1011, Invalid=13995, Unknown=0, NotChecked=0, Total=15006 [2021-11-21 01:13:41,363 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 92 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 4194 mSolverCounterSat, 1155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 5349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1155 IncrementalHoareTripleChecker+Valid, 4194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:41,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 162 Invalid, 5349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1155 Valid, 4194 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-21 01:13:41,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-21 01:13:41,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 129. [2021-11-21 01:13:41,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.1796875) internal successors, (151), 128 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:41,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 151 transitions. [2021-11-21 01:13:41,395 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 151 transitions. Word has length 70 [2021-11-21 01:13:41,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:41,395 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 151 transitions. [2021-11-21 01:13:41,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.475) internal successors, (198), 80 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:41,395 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 151 transitions. [2021-11-21 01:13:41,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-21 01:13:41,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:41,396 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:41,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:41,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:41,598 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:41,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:41,599 INFO L85 PathProgramCache]: Analyzing trace with hash -750118163, now seen corresponding path program 13 times [2021-11-21 01:13:41,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:41,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946318799] [2021-11-21 01:13:41,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:41,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:41,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:41,719 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-21 01:13:41,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:41,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946318799] [2021-11-21 01:13:41,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946318799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:41,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65423282] [2021-11-21 01:13:41,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:13:41,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:41,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:41,722 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:41,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:13:41,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:41,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:13:41,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:42,037 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-21 01:13:42,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:13:42,165 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-21 01:13:42,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65423282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:13:42,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705835401] [2021-11-21 01:13:42,167 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:13:42,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:13:42,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:13:42,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:13:42,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:13:42,252 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:13:42,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:13:42,305 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:13:42,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:13:42,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:13:42,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:42,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:42,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:13:42,482 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:13:42,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 234 treesize of output 231 [2021-11-21 01:13:42,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:13:44,107 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:13:44,262 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:13:44,262 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:13:44,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-21 01:13:44,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875853416] [2021-11-21 01:13:44,263 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:13:44,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:13:44,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:13:44,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:13:44,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:13:44,264 INFO L87 Difference]: Start difference. First operand 129 states and 151 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:44,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:44,668 INFO L93 Difference]: Finished difference Result 189 states and 227 transitions. [2021-11-21 01:13:44,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:13:44,669 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-21 01:13:44,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:44,674 INFO L225 Difference]: With dead ends: 189 [2021-11-21 01:13:44,674 INFO L226 Difference]: Without dead ends: 82 [2021-11-21 01:13:44,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 201 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=241, Invalid=1019, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:13:44,675 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:44,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:13:44,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-21 01:13:44,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-21 01:13:44,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1358024691358024) internal successors, (92), 81 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:44,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2021-11-21 01:13:44,697 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 72 [2021-11-21 01:13:44,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:44,697 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2021-11-21 01:13:44,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:13:44,698 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2021-11-21 01:13:44,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 01:13:44,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:44,698 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:44,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:44,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:13:44,899 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:44,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:44,899 INFO L85 PathProgramCache]: Analyzing trace with hash 958449448, now seen corresponding path program 14 times [2021-11-21 01:13:44,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:44,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133995348] [2021-11-21 01:13:44,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:44,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:45,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:53,172 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 9 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:13:53,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:53,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133995348] [2021-11-21 01:13:53,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133995348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:53,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317898947] [2021-11-21 01:13:53,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:13:53,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:53,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:53,173 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:53,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:13:53,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:13:53,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:13:53,305 WARN L261 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 271 conjunts are in the unsatisfiable core [2021-11-21 01:13:53,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:53,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-21 01:14:00,751 INFO L354 Elim1Store]: treesize reduction 95, result has 30.7 percent of original size [2021-11-21 01:14:00,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 70 treesize of output 77 [2021-11-21 01:14:00,963 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 3 proven. 225 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:14:00,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:08,374 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:14:08,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317898947] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:08,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029305877] [2021-11-21 01:14:08,376 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:14:08,376 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:08,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:08,376 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:08,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:14:08,468 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:14:08,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:14:08,519 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:14:08,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:14:08,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:08,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:14:08,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:08,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:14:08,740 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:14:08,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:14:09,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:14:10,618 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:11,317 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:14:11,317 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:11,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 23, 18] total 98 [2021-11-21 01:14:11,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602473464] [2021-11-21 01:14:11,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:14:11,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-21 01:14:11,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:11,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-21 01:14:11,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=10013, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:14:11,322 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand has 98 states, 98 states have (on average 2.357142857142857) internal successors, (231), 98 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:25,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:25,397 INFO L93 Difference]: Finished difference Result 279 states and 319 transitions. [2021-11-21 01:14:25,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-11-21 01:14:25,398 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.357142857142857) internal successors, (231), 98 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-21 01:14:25,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:25,400 INFO L225 Difference]: With dead ends: 279 [2021-11-21 01:14:25,400 INFO L226 Difference]: Without dead ends: 275 [2021-11-21 01:14:25,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 167 SyntacticMatches, 57 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11539 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=1521, Invalid=30341, Unknown=0, NotChecked=0, Total=31862 [2021-11-21 01:14:25,404 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 498 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:25,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 1036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 455 Invalid, 0 Unknown, 498 Unchecked, 0.5s Time] [2021-11-21 01:14:25,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-21 01:14:25,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 162. [2021-11-21 01:14:25,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.1490683229813665) internal successors, (185), 161 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:25,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 185 transitions. [2021-11-21 01:14:25,464 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 185 transitions. Word has length 81 [2021-11-21 01:14:25,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:25,464 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 185 transitions. [2021-11-21 01:14:25,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.357142857142857) internal successors, (231), 98 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:25,465 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 185 transitions. [2021-11-21 01:14:25,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 01:14:25,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:25,465 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:25,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:25,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:14:25,666 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:25,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:25,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1393186262, now seen corresponding path program 15 times [2021-11-21 01:14:25,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:25,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414046753] [2021-11-21 01:14:25,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:25,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:25,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:25,828 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:14:25,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:25,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414046753] [2021-11-21 01:14:25,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414046753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:25,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770739259] [2021-11-21 01:14:25,828 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:14:25,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:25,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:25,830 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:25,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:14:25,952 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:14:25,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:14:25,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:14:25,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:26,285 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:14:26,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:26,469 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:14:26,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770739259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:26,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [290448031] [2021-11-21 01:14:26,474 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:14:26,474 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:26,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:26,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:26,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:14:26,563 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:14:26,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:14:26,624 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:14:26,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:14:26,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:14:26,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:26,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:26,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:26,775 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:14:26,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:14:27,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:14:28,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:28,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:14:28,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:28,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-21 01:14:28,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911579045] [2021-11-21 01:14:28,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:14:28,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:14:28,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:28,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:14:28,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:14:28,726 INFO L87 Difference]: Start difference. First operand 162 states and 185 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:29,302 INFO L93 Difference]: Finished difference Result 357 states and 412 transitions. [2021-11-21 01:14:29,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:14:29,302 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-21 01:14:29,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:29,303 INFO L225 Difference]: With dead ends: 357 [2021-11-21 01:14:29,303 INFO L226 Difference]: Without dead ends: 155 [2021-11-21 01:14:29,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=298, Invalid=1108, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:14:29,304 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:29,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 17 Invalid, 1001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:14:29,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-21 01:14:29,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 148. [2021-11-21 01:14:29,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.129251700680272) internal successors, (166), 147 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:29,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 166 transitions. [2021-11-21 01:14:29,371 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 166 transitions. Word has length 82 [2021-11-21 01:14:29,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:29,371 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 166 transitions. [2021-11-21 01:14:29,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:29,372 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 166 transitions. [2021-11-21 01:14:29,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-21 01:14:29,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:29,373 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:29,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:29,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:14:29,598 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:29,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:29,599 INFO L85 PathProgramCache]: Analyzing trace with hash 327371208, now seen corresponding path program 16 times [2021-11-21 01:14:29,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:29,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140947017] [2021-11-21 01:14:29,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:29,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:29,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:29,754 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:14:29,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:29,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140947017] [2021-11-21 01:14:29,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140947017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:29,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671938657] [2021-11-21 01:14:29,755 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:14:29,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:29,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:29,762 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:29,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:14:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:29,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:14:29,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:30,076 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:14:30,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:30,228 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:14:30,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671938657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:30,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970399199] [2021-11-21 01:14:30,230 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:14:30,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:30,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:30,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:30,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:14:30,363 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:14:30,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:14:30,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:14:30,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:14:30,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:30,528 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:14:30,548 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:14:30,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 233 treesize of output 236 [2021-11-21 01:14:30,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:14:32,145 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:32,309 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:14:32,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:32,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-21 01:14:32,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732799792] [2021-11-21 01:14:32,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:14:32,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:14:32,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:32,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:14:32,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:14:32,310 INFO L87 Difference]: Start difference. First operand 148 states and 166 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:32,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:32,801 INFO L93 Difference]: Finished difference Result 152 states and 170 transitions. [2021-11-21 01:14:32,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:14:32,801 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-21 01:14:32,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:32,802 INFO L225 Difference]: With dead ends: 152 [2021-11-21 01:14:32,802 INFO L226 Difference]: Without dead ends: 93 [2021-11-21 01:14:32,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 233 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=299, Invalid=1261, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:14:32,804 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 453 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 453 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:32,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 11 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [453 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:14:32,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-21 01:14:32,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-11-21 01:14:32,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1195652173913044) internal successors, (103), 92 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:32,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2021-11-21 01:14:32,828 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 83 [2021-11-21 01:14:32,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:32,828 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2021-11-21 01:14:32,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:32,829 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2021-11-21 01:14:32,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-21 01:14:32,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:32,830 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:32,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:33,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:14:33,044 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:33,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:33,044 INFO L85 PathProgramCache]: Analyzing trace with hash -999129760, now seen corresponding path program 17 times [2021-11-21 01:14:33,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:33,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292153251] [2021-11-21 01:14:33,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:33,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:33,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:45,476 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 18 proven. 290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:14:45,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:45,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292153251] [2021-11-21 01:14:45,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292153251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:45,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854053631] [2021-11-21 01:14:45,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:14:45,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:45,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:45,477 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:45,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:14:45,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:14:45,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:14:45,634 WARN L261 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 313 conjunts are in the unsatisfiable core [2021-11-21 01:14:45,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:45,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-21 01:14:54,698 INFO L354 Elim1Store]: treesize reduction 219, result has 27.2 percent of original size [2021-11-21 01:14:54,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 88 treesize of output 119 [2021-11-21 01:14:54,971 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 4 proven. 298 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:14:54,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:03,643 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:15:03,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854053631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:03,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274355319] [2021-11-21 01:15:03,644 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:15:03,644 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:03,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:03,645 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:03,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:03,732 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:15:03,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:15:03,789 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:03,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:03,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:03,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:03,941 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:03,961 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:03,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 233 treesize of output 236 [2021-11-21 01:15:04,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:05,815 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:06,599 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:06,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:06,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 25, 20] total 110 [2021-11-21 01:15:06,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766629930] [2021-11-21 01:15:06,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:06,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2021-11-21 01:15:06,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:06,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-11-21 01:15:06,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=12530, Unknown=0, NotChecked=0, Total=13110 [2021-11-21 01:15:06,603 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 110 states, 110 states have (on average 2.381818181818182) internal successors, (262), 110 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) [2021-11-21 01:15:26,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:26,326 INFO L93 Difference]: Finished difference Result 324 states and 364 transitions. [2021-11-21 01:15:26,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-21 01:15:26,328 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 2.381818181818182) internal successors, (262), 110 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) Word has length 92 [2021-11-21 01:15:26,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:26,329 INFO L225 Difference]: With dead ends: 324 [2021-11-21 01:15:26,330 INFO L226 Difference]: Without dead ends: 320 [2021-11-21 01:15:26,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 197 SyntacticMatches, 59 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15784 ImplicationChecksByTransitivity, 40.3s TimeCoverageRelationStatistics Valid=1806, Invalid=42084, Unknown=0, NotChecked=0, Total=43890 [2021-11-21 01:15:26,332 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:26,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 111 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 155 Invalid, 0 Unknown, 156 Unchecked, 0.1s Time] [2021-11-21 01:15:26,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-21 01:15:26,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 184. [2021-11-21 01:15:26,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 183 states have (on average 1.1311475409836065) internal successors, (207), 183 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) [2021-11-21 01:15:26,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 207 transitions. [2021-11-21 01:15:26,401 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 207 transitions. Word has length 92 [2021-11-21 01:15:26,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:26,402 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 207 transitions. [2021-11-21 01:15:26,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 2.381818181818182) internal successors, (262), 110 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) [2021-11-21 01:15:26,402 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 207 transitions. [2021-11-21 01:15:26,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 01:15:26,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:26,403 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:26,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:26,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:26,614 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:26,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:26,615 INFO L85 PathProgramCache]: Analyzing trace with hash 2021528304, now seen corresponding path program 18 times [2021-11-21 01:15:26,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:26,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570912212] [2021-11-21 01:15:26,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:26,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:26,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:26,821 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:15:26,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:26,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570912212] [2021-11-21 01:15:26,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570912212] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:26,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115448743] [2021-11-21 01:15:26,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:15:26,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:26,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:26,823 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:26,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:15:26,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:15:26,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:26,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:15:26,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:27,191 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:15:27,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:27,367 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:15:27,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115448743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:27,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1249793208] [2021-11-21 01:15:27,368 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:15:27,368 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:27,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:27,368 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:27,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:27,487 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:27,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:27,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:27,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:27,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:27,710 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:27,737 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:27,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 229 treesize of output 232 [2021-11-21 01:15:28,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:29,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:29,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:29,854 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:29,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:15:29,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910446207] [2021-11-21 01:15:29,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:29,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:15:29,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:29,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:15:29,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=889, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:15:29,855 INFO L87 Difference]: Start difference. First operand 184 states and 207 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:30,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:30,577 INFO L93 Difference]: Finished difference Result 404 states and 459 transitions. [2021-11-21 01:15:30,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:15:30,578 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-21 01:15:30,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:30,579 INFO L225 Difference]: With dead ends: 404 [2021-11-21 01:15:30,579 INFO L226 Difference]: Without dead ends: 174 [2021-11-21 01:15:30,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=365, Invalid=1357, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:15:30,580 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 623 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 623 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:30,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 17 Invalid, 1175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [623 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:15:30,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-21 01:15:30,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 167. [2021-11-21 01:15:30,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.1144578313253013) internal successors, (185), 166 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:30,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 185 transitions. [2021-11-21 01:15:30,630 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 185 transitions. Word has length 93 [2021-11-21 01:15:30,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:30,630 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 185 transitions. [2021-11-21 01:15:30,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:30,630 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 185 transitions. [2021-11-21 01:15:30,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 01:15:30,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:30,631 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:30,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:30,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:30,846 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:30,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:30,847 INFO L85 PathProgramCache]: Analyzing trace with hash 948644288, now seen corresponding path program 19 times [2021-11-21 01:15:30,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:30,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858412816] [2021-11-21 01:15:30,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:30,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:30,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-21 01:15:31,068 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:31,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858412816] [2021-11-21 01:15:31,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858412816] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:31,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131415035] [2021-11-21 01:15:31,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:15:31,069 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:31,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:31,074 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:31,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:15:31,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:31,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:15:31,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:31,453 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-21 01:15:31,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:31,625 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-21 01:15:31,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131415035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:31,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007175726] [2021-11-21 01:15:31,626 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:15:31,626 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:31,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:31,627 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:31,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:31,705 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:15:31,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:15:31,771 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:31,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:31,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:31,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:31,933 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:31,953 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:31,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 233 treesize of output 236 [2021-11-21 01:15:32,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:33,816 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:33,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:33,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:33,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:15:33,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669395766] [2021-11-21 01:15:33,995 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:33,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:15:33,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:33,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:15:33,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:15:33,996 INFO L87 Difference]: Start difference. First operand 167 states and 185 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:34,562 INFO L93 Difference]: Finished difference Result 171 states and 189 transitions. [2021-11-21 01:15:34,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:15:34,562 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-21 01:15:34,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:34,563 INFO L225 Difference]: With dead ends: 171 [2021-11-21 01:15:34,563 INFO L226 Difference]: Without dead ends: 104 [2021-11-21 01:15:34,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 265 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=364, Invalid=1528, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:15:34,564 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 444 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 444 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:34,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 1191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [444 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:15:34,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-21 01:15:34,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-21 01:15:34,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 103 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 114 transitions. [2021-11-21 01:15:34,588 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 114 transitions. Word has length 94 [2021-11-21 01:15:34,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:34,589 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 114 transitions. [2021-11-21 01:15:34,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,589 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 114 transitions. [2021-11-21 01:15:34,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 01:15:34,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:34,589 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:34,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:34,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:34,790 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:34,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:34,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1739679272, now seen corresponding path program 20 times [2021-11-21 01:15:34,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:34,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640296033] [2021-11-21 01:15:34,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:34,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:35,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:51,168 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 23 proven. 373 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:15:51,168 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:51,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640296033] [2021-11-21 01:15:51,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640296033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:51,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833560751] [2021-11-21 01:15:51,169 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:15:51,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:51,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:51,186 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:51,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a07bb1e9-a806-4fa9-bb44-0eafa688334d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:15:51,349 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:15:51,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:51,355 WARN L261 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 357 conjunts are in the unsatisfiable core [2021-11-21 01:15:51,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:51,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-21 01:16:11,456 INFO L354 Elim1Store]: treesize reduction 263, result has 28.7 percent of original size [2021-11-21 01:16:11,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 6 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 84 treesize of output 137 [2021-11-21 01:16:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 4 proven. 386 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:16:12,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:16:42,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 128 [2021-11-21 01:16:42,534 INFO L354 Elim1Store]: treesize reduction 397, result has 4.1 percent of original size [2021-11-21 01:16:42,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 14094 treesize of output 8606