./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/nested6.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/nested6.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 327b0d5e70f014fe291a4771fe2bbb17cb1148e77fe8f6a261d10a47df8adacc --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:47:23,768 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:47:23,772 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:47:23,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:47:23,836 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:47:23,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:47:23,845 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:47:23,849 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:47:23,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:47:23,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:47:23,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:47:23,866 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:47:23,866 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:47:23,870 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:47:23,872 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:47:23,880 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:47:23,883 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:47:23,885 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:47:23,887 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:47:23,894 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:47:23,897 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:47:23,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:47:23,903 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:47:23,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:47:23,911 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:47:23,912 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:47:23,912 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:47:23,915 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:47:23,916 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:47:23,917 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:47:23,918 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:47:23,919 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:47:23,921 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:47:23,923 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:47:23,925 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:47:23,925 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:47:23,926 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:47:23,927 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:47:23,927 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:47:23,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:47:23,929 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:47:23,930 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:47:23,978 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:47:23,978 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:47:23,979 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:47:23,979 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:47:23,981 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:47:23,988 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:47:23,988 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:47:23,989 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:47:23,989 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:47:23,989 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:47:23,991 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:47:23,991 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:47:23,991 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:47:23,992 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:47:23,992 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:47:23,992 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:47:23,992 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:47:23,993 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:47:23,994 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:47:23,994 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:47:23,994 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:47:23,995 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:47:23,995 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:47:23,995 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:47:23,995 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:47:23,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:47:23,998 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:47:23,998 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:47:23,999 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:47:23,999 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:47:23,999 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:47:24,000 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:47:24,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:47:24,000 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:47:24,001 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:47:24,001 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:47:24,001 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:47:24,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:47:24,002 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:47:24,002 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:47:24,002 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:47:24,003 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_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 327b0d5e70f014fe291a4771fe2bbb17cb1148e77fe8f6a261d10a47df8adacc [2021-11-25 17:47:24,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:47:24,329 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:47:24,332 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:47:24,334 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:47:24,335 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:47:24,336 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loop-invgen/nested6.i [2021-11-25 17:47:24,436 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/data/eee834f9e/cab02a614b1c4dd5b45e387d1e397be0/FLAGa8820ad97 [2021-11-25 17:47:24,916 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:47:24,917 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/sv-benchmarks/c/loop-invgen/nested6.i [2021-11-25 17:47:24,930 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/data/eee834f9e/cab02a614b1c4dd5b45e387d1e397be0/FLAGa8820ad97 [2021-11-25 17:47:25,289 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/data/eee834f9e/cab02a614b1c4dd5b45e387d1e397be0 [2021-11-25 17:47:25,292 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:47:25,293 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:47:25,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:47:25,302 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:47:25,306 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:47:25,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,310 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12a20ee6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25, skipping insertion in model container [2021-11-25 17:47:25,310 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,319 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:47:25,340 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:47:25,495 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_26b019ce-177c-4bfa-8388-aa6404ebce43/sv-benchmarks/c/loop-invgen/nested6.i[893,906] [2021-11-25 17:47:25,541 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:47:25,551 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:47:25,567 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_26b019ce-177c-4bfa-8388-aa6404ebce43/sv-benchmarks/c/loop-invgen/nested6.i[893,906] [2021-11-25 17:47:25,573 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:47:25,587 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:47:25,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25 WrapperNode [2021-11-25 17:47:25,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:47:25,588 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:47:25,588 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:47:25,589 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:47:25,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,604 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,624 INFO L137 Inliner]: procedures = 16, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 58 [2021-11-25 17:47:25,625 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:47:25,626 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:47:25,626 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:47:25,626 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:47:25,636 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,638 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,641 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,646 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,647 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,649 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:47:25,650 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:47:25,651 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:47:25,651 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:47:25,663 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (1/1) ... [2021-11-25 17:47:25,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:47:25,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:25,708 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:47:25,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:47:25,767 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:47:25,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:47:25,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:47:25,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:47:25,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:47:25,768 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:47:25,843 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:47:25,845 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:47:26,014 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:47:26,037 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:47:26,037 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 17:47:26,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:47:26 BoogieIcfgContainer [2021-11-25 17:47:26,040 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:47:26,042 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:47:26,042 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:47:26,046 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:47:26,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:47:25" (1/3) ... [2021-11-25 17:47:26,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a1f2e7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:47:26, skipping insertion in model container [2021-11-25 17:47:26,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:47:25" (2/3) ... [2021-11-25 17:47:26,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a1f2e7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:47:26, skipping insertion in model container [2021-11-25 17:47:26,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:47:26" (3/3) ... [2021-11-25 17:47:26,049 INFO L111 eAbstractionObserver]: Analyzing ICFG nested6.i [2021-11-25 17:47:26,054 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:47:26,061 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:47:26,114 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:47:26,123 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:47:26,124 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:47:26,144 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:47:26,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 17:47:26,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:26,150 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:26,151 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:26,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:26,158 INFO L85 PathProgramCache]: Analyzing trace with hash -561695839, now seen corresponding path program 1 times [2021-11-25 17:47:26,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:26,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167783612] [2021-11-25 17:47:26,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:26,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:26,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:26,412 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:47:26,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:26,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167783612] [2021-11-25 17:47:26,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167783612] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:47:26,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:47:26,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:47:26,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658036426] [2021-11-25 17:47:26,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:47:26,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:47:26,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:26,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:47:26,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:47:26,508 INFO L87 Difference]: Start difference. First operand has 21 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:47:26,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:26,682 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2021-11-25 17:47:26,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:47:26,685 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 17:47:26,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:26,696 INFO L225 Difference]: With dead ends: 46 [2021-11-25 17:47:26,696 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 17:47:26,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:47:26,710 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:26,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 58 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:47:26,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 17:47:26,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-25 17:47:26,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:47:26,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-25 17:47:26,782 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 10 [2021-11-25 17:47:26,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:26,783 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-25 17:47:26,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:47:26,784 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-25 17:47:26,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 17:47:26,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:26,785 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:26,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:47:26,787 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:26,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:26,793 INFO L85 PathProgramCache]: Analyzing trace with hash -724613692, now seen corresponding path program 1 times [2021-11-25 17:47:26,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:26,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041928557] [2021-11-25 17:47:26,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:26,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:26,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:26,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:47:26,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:26,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041928557] [2021-11-25 17:47:26,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041928557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:47:26,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:47:26,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:47:26,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043267542] [2021-11-25 17:47:26,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:47:26,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:47:26,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:26,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:47:26,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:47:26,909 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:47:27,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:27,099 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-11-25 17:47:27,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:47:27,100 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 17:47:27,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:27,101 INFO L225 Difference]: With dead ends: 33 [2021-11-25 17:47:27,101 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 17:47:27,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:47:27,104 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:27,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 70 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:47:27,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 17:47:27,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2021-11-25 17:47:27,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:47:27,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-25 17:47:27,123 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2021-11-25 17:47:27,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:27,125 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-25 17:47:27,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:47:27,127 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-25 17:47:27,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 17:47:27,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:27,130 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:27,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:47:27,131 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:27,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:27,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1677400223, now seen corresponding path program 1 times [2021-11-25 17:47:27,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:27,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113103812] [2021-11-25 17:47:27,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:27,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:27,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:47:27,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:27,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113103812] [2021-11-25 17:47:27,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113103812] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:47:27,277 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:47:27,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:47:27,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692694964] [2021-11-25 17:47:27,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:47:27,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:47:27,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:27,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:47:27,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:47:27,280 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 17:47:27,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:27,373 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-11-25 17:47:27,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:47:27,374 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-25 17:47:27,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:27,375 INFO L225 Difference]: With dead ends: 38 [2021-11-25 17:47:27,375 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:47:27,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:47:27,378 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:27,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 60 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:47:27,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:47:27,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-25 17:47:27,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 17:47:27,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-11-25 17:47:27,408 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 15 [2021-11-25 17:47:27,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:27,409 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-11-25 17:47:27,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 17:47:27,409 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-11-25 17:47:27,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 17:47:27,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:27,411 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:27,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:47:27,412 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:27,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:27,413 INFO L85 PathProgramCache]: Analyzing trace with hash -990865919, now seen corresponding path program 1 times [2021-11-25 17:47:27,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:27,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490409971] [2021-11-25 17:47:27,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:27,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:27,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:27,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:47:27,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:27,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490409971] [2021-11-25 17:47:27,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490409971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:47:27,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115849745] [2021-11-25 17:47:27,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:27,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:27,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:27,557 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:47:27,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:47:27,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:27,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 17:47:27,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:47:27,951 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 17:47:27,952 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:47:27,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115849745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:47:27,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:47:27,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2021-11-25 17:47:27,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466033118] [2021-11-25 17:47:27,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:47:27,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:47:27,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:27,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:47:27,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:47:27,957 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 17:47:28,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:28,076 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2021-11-25 17:47:28,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:47:28,076 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-25 17:47:28,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:28,082 INFO L225 Difference]: With dead ends: 95 [2021-11-25 17:47:28,082 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 17:47:28,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 17:47:28,094 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 22 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:28,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 70 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:47:28,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 17:47:28,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2021-11-25 17:47:28,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 17:47:28,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2021-11-25 17:47:28,115 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2021-11-25 17:47:28,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:28,115 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2021-11-25 17:47:28,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 17:47:28,116 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2021-11-25 17:47:28,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 17:47:28,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:28,117 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:28,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:47:28,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:28,342 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:28,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:28,342 INFO L85 PathProgramCache]: Analyzing trace with hash -588741990, now seen corresponding path program 1 times [2021-11-25 17:47:28,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:28,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279232788] [2021-11-25 17:47:28,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:28,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:28,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:28,487 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:47:28,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:28,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279232788] [2021-11-25 17:47:28,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279232788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:47:28,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383346873] [2021-11-25 17:47:28,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:28,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:28,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:28,490 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:47:28,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:47:28,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:28,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 17:47:28,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:47:28,682 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 17:47:28,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:47:28,794 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:47:28,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383346873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:47:28,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679033591] [2021-11-25 17:47:28,817 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 17:47:28,818 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:47:28,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:47:28,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:47:28,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:47:31,007 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 17:47:31,017 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:47:31,819 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '754#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:47:31,819 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:47:31,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:47:31,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 13 [2021-11-25 17:47:31,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443085243] [2021-11-25 17:47:31,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:47:31,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 17:47:31,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:31,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 17:47:31,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-11-25 17:47:31,822 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:47:32,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:32,323 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-25 17:47:32,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 17:47:32,324 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 26 [2021-11-25 17:47:32,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:32,326 INFO L225 Difference]: With dead ends: 105 [2021-11-25 17:47:32,326 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 17:47:32,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=219, Invalid=1341, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 17:47:32,329 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 38 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:32,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 122 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:47:32,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 17:47:32,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 58. [2021-11-25 17:47:32,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 45 states have internal predecessors, (55), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:47:32,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2021-11-25 17:47:32,347 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 26 [2021-11-25 17:47:32,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:32,347 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2021-11-25 17:47:32,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:47:32,348 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2021-11-25 17:47:32,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 17:47:32,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:32,350 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:32,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 17:47:32,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:32,572 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:32,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:32,573 INFO L85 PathProgramCache]: Analyzing trace with hash -733579268, now seen corresponding path program 1 times [2021-11-25 17:47:32,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:32,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690157601] [2021-11-25 17:47:32,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:32,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:32,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:32,709 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:47:32,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:32,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690157601] [2021-11-25 17:47:32,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690157601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:47:32,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518885318] [2021-11-25 17:47:32,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:32,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:32,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:32,712 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:47:32,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:47:32,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:32,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:47:32,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:47:32,992 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:47:32,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:47:33,104 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:47:33,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518885318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:47:33,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944983353] [2021-11-25 17:47:33,110 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 17:47:33,110 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:47:33,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:47:33,110 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:47:33,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:47:35,266 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 17:47:35,274 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:47:36,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1257#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:47:36,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:47:36,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:47:36,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2021-11-25 17:47:36,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065124252] [2021-11-25 17:47:36,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:47:36,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 17:47:36,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:36,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 17:47:36,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2021-11-25 17:47:36,164 INFO L87 Difference]: Start difference. First operand 58 states and 75 transitions. Second operand has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:47:36,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:36,393 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2021-11-25 17:47:36,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:47:36,394 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 34 [2021-11-25 17:47:36,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:36,396 INFO L225 Difference]: With dead ends: 117 [2021-11-25 17:47:36,396 INFO L226 Difference]: Without dead ends: 73 [2021-11-25 17:47:36,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 17:47:36,399 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:36,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 110 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:47:36,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-25 17:47:36,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2021-11-25 17:47:36,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 49 states have internal predecessors, (60), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:47:36,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 82 transitions. [2021-11-25 17:47:36,414 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 82 transitions. Word has length 34 [2021-11-25 17:47:36,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:36,415 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 82 transitions. [2021-11-25 17:47:36,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:47:36,415 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 82 transitions. [2021-11-25 17:47:36,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 17:47:36,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:36,417 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:36,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:47:36,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 17:47:36,646 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:36,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:36,646 INFO L85 PathProgramCache]: Analyzing trace with hash -2108383465, now seen corresponding path program 1 times [2021-11-25 17:47:36,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:36,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311207543] [2021-11-25 17:47:36,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:36,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:36,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:36,730 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:47:36,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:36,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311207543] [2021-11-25 17:47:36,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311207543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:47:36,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877659057] [2021-11-25 17:47:36,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:36,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:36,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:36,738 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:47:36,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:47:36,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:36,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 17:47:36,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:47:36,979 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:47:36,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:47:37,073 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:47:37,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877659057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:47:37,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585180692] [2021-11-25 17:47:37,077 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 17:47:37,077 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:47:37,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:47:37,078 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:47:37,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:47:38,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2021-11-25 17:47:38,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:47:39,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1772#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:47:39,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:47:39,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:47:39,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 17:47:39,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137808455] [2021-11-25 17:47:39,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:47:39,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 17:47:39,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:39,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 17:47:39,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-11-25 17:47:39,252 INFO L87 Difference]: Start difference. First operand 63 states and 82 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:47:39,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:39,364 INFO L93 Difference]: Finished difference Result 126 states and 166 transitions. [2021-11-25 17:47:39,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:47:39,364 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 36 [2021-11-25 17:47:39,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:39,366 INFO L225 Difference]: With dead ends: 126 [2021-11-25 17:47:39,366 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 17:47:39,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-11-25 17:47:39,368 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 51 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:39,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 107 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:47:39,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 17:47:39,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2021-11-25 17:47:39,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 54 states have internal predecessors, (65), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 17:47:39,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 93 transitions. [2021-11-25 17:47:39,384 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 93 transitions. Word has length 36 [2021-11-25 17:47:39,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:39,385 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 93 transitions. [2021-11-25 17:47:39,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:47:39,385 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 93 transitions. [2021-11-25 17:47:39,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 17:47:39,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:47:39,388 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:39,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:47:39,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 17:47:39,603 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:47:39,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:47:39,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1216896472, now seen corresponding path program 1 times [2021-11-25 17:47:39,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:47:39,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746036889] [2021-11-25 17:47:39,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:39,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:47:39,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:39,696 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 28 proven. 1 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 17:47:39,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:47:39,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746036889] [2021-11-25 17:47:39,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746036889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:47:39,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357471886] [2021-11-25 17:47:39,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:47:39,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:39,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:47:39,698 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:47:39,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:47:39,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:47:39,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:47:39,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:47:39,955 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 39 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:47:39,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:47:40,104 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:47:40,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357471886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:47:40,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1523476351] [2021-11-25 17:47:40,107 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 17:47:40,108 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:47:40,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:47:40,109 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:47:40,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:47:41,760 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 17:47:41,767 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:47:42,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2374#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:47:42,442 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:47:42,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:47:42,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9] total 14 [2021-11-25 17:47:42,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632911999] [2021-11-25 17:47:42,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:47:42,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 17:47:42,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:47:42,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 17:47:42,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-11-25 17:47:42,444 INFO L87 Difference]: Start difference. First operand 70 states and 93 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 17:47:43,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:47:43,119 INFO L93 Difference]: Finished difference Result 151 states and 211 transitions. [2021-11-25 17:47:43,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 17:47:43,120 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) Word has length 47 [2021-11-25 17:47:43,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:47:43,121 INFO L225 Difference]: With dead ends: 151 [2021-11-25 17:47:43,121 INFO L226 Difference]: Without dead ends: 0 [2021-11-25 17:47:43,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 117 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=264, Invalid=1806, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 17:47:43,125 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 40 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:47:43,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 136 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 17:47:43,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-25 17:47:43,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-25 17:47:43,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-11-25 17:47:43,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-25 17:47:43,127 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 47 [2021-11-25 17:47:43,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:47:43,127 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-25 17:47:43,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 17:47:43,128 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-25 17:47:43,128 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-25 17:47:43,131 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 17:47:43,153 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 17:47:43,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:47:43,334 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-25 17:47:44,357 INFO L854 garLoopResultBuilder]: At program point L36-2(lines 36 38) the Hoare annotation is: (let ((.cse0 (* 2 |ULTIMATE.start_main_~i~0#1|))) (and (<= .cse0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= .cse0 |ULTIMATE.start_main_~k~0#1|))) [2021-11-25 17:47:44,357 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-25 17:47:44,361 INFO L858 garLoopResultBuilder]: For program point L28(line 28) no Hoare annotation was computed. [2021-11-25 17:47:44,361 INFO L854 garLoopResultBuilder]: At program point L41(line 41) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|)) [2021-11-25 17:47:44,362 INFO L854 garLoopResultBuilder]: At program point L41-1(line 41) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|)) [2021-11-25 17:47:44,362 INFO L854 garLoopResultBuilder]: At program point L37(line 37) the Hoare annotation is: (let ((.cse0 (* 2 |ULTIMATE.start_main_~i~0#1|))) (and (<= .cse0 |ULTIMATE.start_main_~j~0#1|) (<= (+ |ULTIMATE.start_main_~k~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= .cse0 |ULTIMATE.start_main_~k~0#1|))) [2021-11-25 17:47:44,362 INFO L858 garLoopResultBuilder]: For program point L37-1(lines 36 38) no Hoare annotation was computed. [2021-11-25 17:47:44,362 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-25 17:47:44,363 INFO L854 garLoopResultBuilder]: At program point L33-3(lines 33 45) the Hoare annotation is: (let ((.cse0 (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)) (.cse1 (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|))) (or (and .cse0 .cse1 (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~j~0#1|)) (and (= |ULTIMATE.start_main_~i~0#1| 0) .cse0 .cse1))) [2021-11-25 17:47:44,364 INFO L858 garLoopResultBuilder]: For program point L29(lines 29 32) no Hoare annotation was computed. [2021-11-25 17:47:44,364 INFO L861 garLoopResultBuilder]: At program point L46(lines 24 48) the Hoare annotation is: true [2021-11-25 17:47:44,364 INFO L858 garLoopResultBuilder]: For program point L42(lines 34 44) no Hoare annotation was computed. [2021-11-25 17:47:44,365 INFO L854 garLoopResultBuilder]: At program point L34-2(lines 34 44) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|)) [2021-11-25 17:47:44,365 INFO L861 garLoopResultBuilder]: At program point L47(lines 24 48) the Hoare annotation is: true [2021-11-25 17:47:44,365 INFO L858 garLoopResultBuilder]: For program point L35(lines 35 43) no Hoare annotation was computed. [2021-11-25 17:47:44,365 INFO L858 garLoopResultBuilder]: For program point L18-2(lines 17 22) no Hoare annotation was computed. [2021-11-25 17:47:44,365 INFO L861 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 17 22) the Hoare annotation is: true [2021-11-25 17:47:44,365 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertEXIT(lines 17 22) no Hoare annotation was computed. [2021-11-25 17:47:44,366 INFO L858 garLoopResultBuilder]: For program point L19(line 19) no Hoare annotation was computed. [2021-11-25 17:47:44,367 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2021-11-25 17:47:44,367 INFO L858 garLoopResultBuilder]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-11-25 17:47:44,370 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:47:44,372 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 17:47:44,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 05:47:44 BoogieIcfgContainer [2021-11-25 17:47:44,386 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 17:47:44,386 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 17:47:44,386 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 17:47:44,387 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 17:47:44,387 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:47:26" (3/4) ... [2021-11-25 17:47:44,390 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-25 17:47:44,395 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2021-11-25 17:47:44,398 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-11-25 17:47:44,399 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-11-25 17:47:44,399 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-25 17:47:44,399 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-25 17:47:44,451 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/witness.graphml [2021-11-25 17:47:44,452 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 17:47:44,453 INFO L158 Benchmark]: Toolchain (without parser) took 19158.93ms. Allocated memory was 113.2MB in the beginning and 237.0MB in the end (delta: 123.7MB). Free memory was 77.5MB in the beginning and 95.7MB in the end (delta: -18.2MB). Peak memory consumption was 105.4MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,453 INFO L158 Benchmark]: CDTParser took 0.29ms. Allocated memory is still 79.7MB. Free memory was 52.9MB in the beginning and 52.9MB in the end (delta: 27.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:47:44,454 INFO L158 Benchmark]: CACSL2BoogieTranslator took 286.23ms. Allocated memory is still 113.2MB. Free memory was 77.4MB in the beginning and 88.9MB in the end (delta: -11.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,454 INFO L158 Benchmark]: Boogie Procedure Inliner took 36.50ms. Allocated memory is still 113.2MB. Free memory was 88.9MB in the beginning and 87.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,455 INFO L158 Benchmark]: Boogie Preprocessor took 24.11ms. Allocated memory is still 113.2MB. Free memory was 87.3MB in the beginning and 86.2MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,455 INFO L158 Benchmark]: RCFGBuilder took 389.67ms. Allocated memory is still 113.2MB. Free memory was 86.2MB in the beginning and 75.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,456 INFO L158 Benchmark]: TraceAbstraction took 18343.94ms. Allocated memory was 113.2MB in the beginning and 237.0MB in the end (delta: 123.7MB). Free memory was 75.2MB in the beginning and 98.8MB in the end (delta: -23.6MB). Peak memory consumption was 127.4MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,457 INFO L158 Benchmark]: Witness Printer took 65.71ms. Allocated memory is still 237.0MB. Free memory was 98.8MB in the beginning and 95.7MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:47:44,460 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29ms. Allocated memory is still 79.7MB. Free memory was 52.9MB in the beginning and 52.9MB in the end (delta: 27.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 286.23ms. Allocated memory is still 113.2MB. Free memory was 77.4MB in the beginning and 88.9MB in the end (delta: -11.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 36.50ms. Allocated memory is still 113.2MB. Free memory was 88.9MB in the beginning and 87.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 24.11ms. Allocated memory is still 113.2MB. Free memory was 87.3MB in the beginning and 86.2MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 389.67ms. Allocated memory is still 113.2MB. Free memory was 86.2MB in the beginning and 75.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 18343.94ms. Allocated memory was 113.2MB in the beginning and 237.0MB in the end (delta: 123.7MB). Free memory was 75.2MB in the beginning and 98.8MB in the end (delta: -23.6MB). Peak memory consumption was 127.4MB. Max. memory is 16.1GB. * Witness Printer took 65.71ms. Allocated memory is still 237.0MB. Free memory was 98.8MB in the beginning and 95.7MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 18.3s, OverallIterations: 8, TraceHistogramMax: 5, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 237 SdHoareTripleChecker+Valid, 1.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 211 mSDsluCounter, 733 SdHoareTripleChecker+Invalid, 0.8s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 611 mSDsCounter, 221 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 853 IncrementalHoareTripleChecker+Invalid, 1074 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 221 mSolverCounterUnsat, 164 mSDtfsCounter, 853 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 541 GetRequests, 368 SyntacticMatches, 11 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1626 ImplicationChecksByTransitivity, 4.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=7, InterpolantAutomatonStates: 89, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 8 MinimizatonAttempts, 75 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 65 PreInvPairs, 136 NumberOfFragments, 110 HoareAnnotationTreeSize, 65 FomulaSimplifications, 42 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 9 FomulaSimplificationsInter, 19282 FormulaSimplificationTreeSizeReductionInter, 0.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 360 NumberOfCodeBlocks, 360 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 486 ConstructedInterpolants, 0 QuantifiedInterpolants, 1266 SizeOfPredicates, 21 NumberOfNonLiveVariables, 465 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 17 InterpolantComputations, 4 PerfectInterpolantSequences, 389/430 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: ((k <= n && n <= k) && n <= j) || ((i == 0 && k <= n) && n <= k) - InvariantResult [Line: 34]: Loop Invariant Derived loop invariant: (2 * i <= j && k <= n) && n <= k - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: ((2 * i <= j && k <= n) && j + 1 <= n) && 2 * i <= k RESULT: Ultimate proved your program to be correct! [2021-11-25 17:47:44,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_26b019ce-177c-4bfa-8388-aa6404ebce43/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE