./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V --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 2e05249da124fa8fd89a00721e51c7b41eff3d4952cff855bee564f7b5deef09 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:42:50,881 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:42:50,884 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:42:50,942 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:42:50,943 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:42:50,947 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:42:50,949 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:42:50,953 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:42:50,956 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:42:50,962 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:42:50,963 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:42:50,965 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:42:50,966 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:42:50,968 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:42:50,971 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:42:50,976 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:42:50,977 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:42:50,979 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:42:50,981 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:42:50,989 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:42:50,991 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:42:50,993 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:42:50,996 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:42:50,998 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:42:51,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:42:51,008 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:42:51,008 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:42:51,010 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:42:51,011 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:42:51,013 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:42:51,013 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:42:51,015 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:42:51,017 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:42:51,019 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:42:51,020 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:42:51,021 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:42:51,021 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:42:51,022 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:42:51,022 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:42:51,023 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:42:51,024 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:42:51,025 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:42:51,066 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:42:51,067 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:42:51,068 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:42:51,068 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:42:51,069 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:42:51,069 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:42:51,069 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:42:51,070 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:42:51,070 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:42:51,070 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:42:51,071 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:42:51,071 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:42:51,072 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:42:51,072 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:42:51,072 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:42:51,072 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:42:51,073 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:42:51,073 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:42:51,074 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:42:51,074 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:42:51,074 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:42:51,075 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:42:51,075 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:42:51,075 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:42:51,075 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:42:51,075 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:42:51,076 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:42:51,076 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:42:51,076 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:42:51,076 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:42:51,077 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:42:51,077 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:42:51,077 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:42:51,078 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:42:51,078 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:42:51,078 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:42:51,078 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:42:51,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:42:51,079 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:42:51,079 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:42:51,079 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:42:51,080 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_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e05249da124fa8fd89a00721e51c7b41eff3d4952cff855bee564f7b5deef09 [2021-11-23 03:42:51,341 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:42:51,366 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:42:51,368 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:42:51,370 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:42:51,370 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:42:51,372 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c [2021-11-23 03:42:51,451 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/data/952aa98ac/85aa6c28df654b2b9745e96a5a0f8540/FLAG3c8b32201 [2021-11-23 03:42:52,003 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:42:52,003 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c [2021-11-23 03:42:52,014 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/data/952aa98ac/85aa6c28df654b2b9745e96a5a0f8540/FLAG3c8b32201 [2021-11-23 03:42:52,364 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/data/952aa98ac/85aa6c28df654b2b9745e96a5a0f8540 [2021-11-23 03:42:52,368 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:42:52,370 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:42:52,374 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:42:52,374 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:42:52,377 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:42:52,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39e434e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52, skipping insertion in model container [2021-11-23 03:42:52,380 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,387 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:42:52,403 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:42:52,604 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_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c[525,538] [2021-11-23 03:42:52,621 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:42:52,633 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:42:52,648 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_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound2.c[525,538] [2021-11-23 03:42:52,659 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:42:52,675 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:42:52,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52 WrapperNode [2021-11-23 03:42:52,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:42:52,677 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:42:52,677 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:42:52,677 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:42:52,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,692 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,713 INFO L137 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2021-11-23 03:42:52,714 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:42:52,715 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:42:52,715 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:42:52,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:42:52,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,736 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,736 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,744 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,748 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,752 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:42:52,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:42:52,760 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:42:52,761 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:42:52,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (1/1) ... [2021-11-23 03:42:52,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:42:52,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:52,799 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:42:52,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:42:52,852 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:42:52,852 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:42:52,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:42:52,852 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:42:52,853 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:42:52,853 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:42:52,925 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:42:52,927 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:42:53,089 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:42:53,101 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:42:53,107 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:42:53,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:42:53 BoogieIcfgContainer [2021-11-23 03:42:53,110 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:42:53,111 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:42:53,112 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:42:53,116 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:42:53,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:42:52" (1/3) ... [2021-11-23 03:42:53,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b8f52ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:42:53, skipping insertion in model container [2021-11-23 03:42:53,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:52" (2/3) ... [2021-11-23 03:42:53,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b8f52ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:42:53, skipping insertion in model container [2021-11-23 03:42:53,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:42:53" (3/3) ... [2021-11-23 03:42:53,120 INFO L111 eAbstractionObserver]: Analyzing ICFG geo2-ll_unwindbound2.c [2021-11-23 03:42:53,126 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:42:53,126 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:42:53,194 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:42:53,206 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 [2021-11-23 03:42:53,206 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:42:53,232 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:42:53,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:42:53,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:53,245 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:42:53,245 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:53,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:53,254 INFO L85 PathProgramCache]: Analyzing trace with hash 2138246143, now seen corresponding path program 1 times [2021-11-23 03:42:53,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:53,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802781280] [2021-11-23 03:42:53,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:53,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:53,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:53,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:53,439 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:53,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802781280] [2021-11-23 03:42:53,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802781280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:53,440 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:53,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:42:53,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877558820] [2021-11-23 03:42:53,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:53,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:42:53,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:53,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:42:53,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:42:53,505 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-11-23 03:42:53,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:53,529 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-23 03:42:53,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:42:53,531 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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 6 [2021-11-23 03:42:53,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:53,539 INFO L225 Difference]: With dead ends: 27 [2021-11-23 03:42:53,540 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 03:42:53,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:42:53,547 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:53,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:53,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 03:42:53,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 03:42:53,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 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) [2021-11-23 03:42:53,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-11-23 03:42:53,605 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2021-11-23 03:42:53,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:53,606 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-11-23 03:42:53,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-11-23 03:42:53,606 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-11-23 03:42:53,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:42:53,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:53,607 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:42:53,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:42:53,612 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:53,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:53,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1461620770, now seen corresponding path program 1 times [2021-11-23 03:42:53,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:53,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873008536] [2021-11-23 03:42:53,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:53,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:53,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:53,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:53,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:53,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873008536] [2021-11-23 03:42:53,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873008536] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:53,714 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:53,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:42:53,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910164780] [2021-11-23 03:42:53,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:53,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:53,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:53,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:53,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:53,718 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-23 03:42:53,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:53,736 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-11-23 03:42:53,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:53,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-11-23 03:42:53,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:53,738 INFO L225 Difference]: With dead ends: 21 [2021-11-23 03:42:53,738 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:42:53,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:53,741 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:53,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:53,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:42:53,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-23 03:42:53,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 2 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) [2021-11-23 03:42:53,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-23 03:42:53,747 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 7 [2021-11-23 03:42:53,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:53,747 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-23 03:42:53,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-23 03:42:53,748 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-23 03:42:53,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:42:53,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:53,749 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:42:53,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:42:53,749 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:53,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:53,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1463408230, now seen corresponding path program 1 times [2021-11-23 03:42:53,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:53,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315399661] [2021-11-23 03:42:53,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:53,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:53,763 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:42:53,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [627252897] [2021-11-23 03:42:53,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:53,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:53,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:53,769 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:42:53,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:42:53,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:53,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:42:53,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:53,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:53,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:42:53,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:53,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315399661] [2021-11-23 03:42:53,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:42:53,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627252897] [2021-11-23 03:42:53,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627252897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:53,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:53,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:53,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839818936] [2021-11-23 03:42:53,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:53,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:42:53,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:53,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:42:53,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:42:53,983 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-23 03:42:54,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:54,052 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-11-23 03:42:54,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:42:54,053 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-11-23 03:42:54,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:54,053 INFO L225 Difference]: With dead ends: 23 [2021-11-23 03:42:54,054 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 03:42:54,054 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 [2021-11-23 03:42:54,056 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:54,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 38 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:54,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 03:42:54,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 03:42:54,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:42:54,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-23 03:42:54,062 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2021-11-23 03:42:54,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:54,063 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-23 03:42:54,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-23 03:42:54,063 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-23 03:42:54,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:42:54,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:54,064 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:42:54,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:42:54,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:54,265 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:54,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:54,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1726160663, now seen corresponding path program 1 times [2021-11-23 03:42:54,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:54,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668237765] [2021-11-23 03:42:54,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:54,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:54,286 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:42:54,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2104468591] [2021-11-23 03:42:54,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:54,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:54,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:54,290 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:42:54,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:42:54,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:54,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:42:54,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:54,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:54,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:42:54,530 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:54,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:54,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668237765] [2021-11-23 03:42:54,531 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:42:54,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104468591] [2021-11-23 03:42:54,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104468591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:42:54,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492268510] [2021-11-23 03:42:54,581 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 03:42:54,581 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:42:54,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:42:54,591 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:42:54,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:42:56,783 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:42:56,808 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:42:57,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (<= ~counter~0 3) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:42:57,442 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:42:57,443 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:42:57,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2021-11-23 03:42:57,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375434740] [2021-11-23 03:42:57,443 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:42:57,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:42:57,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:57,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:42:57,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:42:57,446 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:42:57,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:57,487 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-11-23 03:42:57,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:42:57,488 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2021-11-23 03:42:57,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:57,489 INFO L225 Difference]: With dead ends: 29 [2021-11-23 03:42:57,489 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 03:42:57,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:42:57,492 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:57,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:57,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 03:42:57,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 03:42:57,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:42:57,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-23 03:42:57,500 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2021-11-23 03:42:57,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:57,501 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-23 03:42:57,501 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:42:57,501 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-23 03:42:57,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:42:57,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:57,502 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:42:57,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:42:57,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:57,718 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:57,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:57,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1724373203, now seen corresponding path program 1 times [2021-11-23 03:42:57,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:57,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622361979] [2021-11-23 03:42:57,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:57,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:57,745 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:42:57,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1471256402] [2021-11-23 03:42:57,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:57,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:57,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:57,751 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:42:57,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:42:57,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:57,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:42:57,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:57,924 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:57,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:42:58,097 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:58,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:58,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622361979] [2021-11-23 03:42:58,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:42:58,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471256402] [2021-11-23 03:42:58,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471256402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:42:58,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [759961476] [2021-11-23 03:42:58,108 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:42:58,111 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:42:58,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:42:58,112 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:42:58,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:42:59,388 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:42:59,428 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:00,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [759961476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:00,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:43:00,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 12 [2021-11-23 03:43:00,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222573214] [2021-11-23 03:43:00,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:00,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:43:00,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:00,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:43:00,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:43:00,380 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:43:00,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:00,493 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-11-23 03:43:00,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:43:00,494 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-23 03:43:00,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:00,495 INFO L225 Difference]: With dead ends: 29 [2021-11-23 03:43:00,495 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 03:43:00,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:43:00,498 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:00,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:00,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 03:43:00,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 03:43:00,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:43:00,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-11-23 03:43:00,505 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 15 [2021-11-23 03:43:00,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:00,506 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-11-23 03:43:00,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:43:00,515 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-11-23 03:43:00,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 03:43:00,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:00,516 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 03:43:00,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:00,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:00,742 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:00,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:00,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1594000720, now seen corresponding path program 2 times [2021-11-23 03:43:00,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:00,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896951763] [2021-11-23 03:43:00,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:00,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:00,752 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:43:00,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2081398048] [2021-11-23 03:43:00,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:43:00,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:00,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:00,757 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:00,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:43:00,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:43:00,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:43:00,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:43:00,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:02,674 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:43:02,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:02,877 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:43:02,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:02,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896951763] [2021-11-23 03:43:02,878 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:43:02,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081398048] [2021-11-23 03:43:02,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081398048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:02,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520048674] [2021-11-23 03:43:02,881 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 03:43:02,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:02,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:02,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:02,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:03,888 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:43:03,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:05,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '684#(and (<= ~counter~0 3) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:05,054 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:05,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:43:05,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-11-23 03:43:05,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034751908] [2021-11-23 03:43:05,054 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:05,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:43:05,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:05,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:43:05,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:43:05,056 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:43:05,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:05,162 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-11-23 03:43:05,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:43:05,163 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2021-11-23 03:43:05,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:05,163 INFO L225 Difference]: With dead ends: 24 [2021-11-23 03:43:05,163 INFO L226 Difference]: Without dead ends: 0 [2021-11-23 03:43:05,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:43:05,165 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 12 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:05,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 43 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:05,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-23 03:43:05,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-23 03:43:05,167 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) [2021-11-23 03:43:05,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-23 03:43:05,168 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2021-11-23 03:43:05,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:05,168 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-23 03:43:05,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:43:05,169 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-23 03:43:05,169 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-23 03:43:05,172 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-23 03:43:05,200 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-23 03:43:05,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:43:05,388 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-23 03:43:10,952 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-23 03:43:10,953 INFO L861 garLoopResultBuilder]: At program point L44(line 44) the Hoare annotation is: true [2021-11-23 03:43:10,953 INFO L858 garLoopResultBuilder]: For program point L34-1(lines 34 43) no Hoare annotation was computed. [2021-11-23 03:43:10,953 INFO L854 garLoopResultBuilder]: At program point L34-3(lines 34 43) the Hoare annotation is: (let ((.cse0 (<= 0 (+ |ULTIMATE.start_main_~k~0#1| 2147483648))) (.cse1 (<= |ULTIMATE.start_main_~z~0#1| 2147483647)) (.cse2 (<= 0 (+ |ULTIMATE.start_main_~z~0#1| 2147483648))) (.cse3 (<= 1 |ULTIMATE.start_main_~c~0#1|)) (.cse4 (<= |ULTIMATE.start_main_~k~0#1| 2147483647)) (.cse5 (<= |#NULL.offset| 0)) (.cse9 (<= 0 |#NULL.offset|)) (.cse10 (<= 0 |#StackHeapBarrier|)) (.cse11 (<= |ULTIMATE.start_main_~c~0#1| 3)) (.cse12 (= |#NULL.base| 0))) (or (and .cse0 .cse1 .cse2 .cse3 .cse4 (<= 0 ~counter~0) .cse5 (let ((.cse6 (= |ULTIMATE.start_main_~z~0#1| 0))) (or (and (= |ULTIMATE.start_main_~x~0#1| 1) (= |ULTIMATE.start_main_~y~0#1| 0) .cse6) (let ((.cse8 (+ (- 1) |ULTIMATE.start_main_~x~0#1|))) (and (= (mod |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) 0) (not .cse6) (let ((.cse7 (div .cse8 |ULTIMATE.start_main_~z~0#1|))) (= (+ (* (div |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) |ULTIMATE.start_main_~z~0#1|) .cse7) (+ (* |ULTIMATE.start_main_~z~0#1| .cse7) 1))) (= (mod .cse8 |ULTIMATE.start_main_~z~0#1|) 0))))) .cse9 .cse10 (<= ~counter~0 2) .cse11 .cse12) (and .cse0 .cse1 .cse2 .cse3 .cse4 .cse5 (= |ULTIMATE.start_main_~y~0#1| 1) (= ~counter~0 0) .cse9 .cse10 (= (+ (* |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) |ULTIMATE.start_main_~x~0#1|) (+ (* |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1)) .cse11 .cse12))) [2021-11-23 03:43:10,953 INFO L854 garLoopResultBuilder]: At program point L34-4(lines 34 43) the Hoare annotation is: (let ((.cse0 (= |ULTIMATE.start_main_~x~0#1| 1)) (.cse1 (= |ULTIMATE.start_main_~z~0#1| 0))) (or (and .cse0 (= |ULTIMATE.start_main_~y~0#1| 0) .cse1) (and .cse0 (= |ULTIMATE.start_main_~y~0#1| 1)) (let ((.cse3 (+ (- 1) |ULTIMATE.start_main_~x~0#1|))) (and (= (mod |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) 0) (not .cse1) (let ((.cse2 (div .cse3 |ULTIMATE.start_main_~z~0#1|))) (= (+ (* (div |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) |ULTIMATE.start_main_~z~0#1|) .cse2) (+ (* |ULTIMATE.start_main_~z~0#1| .cse2) 1))) (= (mod .cse3 |ULTIMATE.start_main_~z~0#1|) 0))))) [2021-11-23 03:43:10,953 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-23 03:43:10,954 INFO L854 garLoopResultBuilder]: At program point L35(line 35) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 (+ |ULTIMATE.start_main_~k~0#1| 2147483648)) (<= |ULTIMATE.start_main_~z~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~z~0#1| 2147483648)) (let ((.cse10 (select |#memory_int| 1))) (let ((.cse0 (= (select |#length| 3) 12)) (.cse1 (= 2 (select |#length| 1))) (.cse2 (= (select |#valid| 3) 1)) (.cse3 (= (select |#valid| 1) 1)) (.cse4 (= (select |#valid| 0) 0)) (.cse5 (= (select |#valid| 2) 1)) (.cse6 (= (select .cse10 0) 48)) (.cse7 (= 10 (select |#length| 2))) (.cse8 (= (select .cse10 1) 0)) (.cse9 (< 0 |#StackHeapBarrier|))) (or (and .cse0 (= |ULTIMATE.start_main_~c~0#1| 1) .cse1 .cse2 (= |ULTIMATE.start_main_~x~0#1| 1) (= |ULTIMATE.start_main_~y~0#1| 1) .cse3 .cse4 .cse5 .cse6 (= ~counter~0 1) .cse7 .cse8 .cse9) (and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) .cse0 .cse1 .cse2 .cse3 (= |ULTIMATE.start_main_~x~0#1| (+ |ULTIMATE.start_main_~z~0#1| 1)) (< |ULTIMATE.start_main_~c~0#1| (+ |ULTIMATE.start_main_~k~0#1| 1)) .cse4 .cse5 .cse6 .cse7 (= 2 |ULTIMATE.start_main_~c~0#1|) .cse8 (= ~counter~0 2) .cse9)))) (<= |ULTIMATE.start_main_~k~0#1| 2147483647) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|)) [2021-11-23 03:43:10,954 INFO L858 garLoopResultBuilder]: For program point L35-1(lines 34 43) no Hoare annotation was computed. [2021-11-23 03:43:10,954 INFO L858 garLoopResultBuilder]: For program point L16(lines 16 17) no Hoare annotation was computed. [2021-11-23 03:43:10,954 INFO L858 garLoopResultBuilder]: For program point L15(lines 15 18) no Hoare annotation was computed. [2021-11-23 03:43:10,954 INFO L861 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 14 20) the Hoare annotation is: true [2021-11-23 03:43:10,954 INFO L858 garLoopResultBuilder]: For program point L15-2(lines 14 20) no Hoare annotation was computed. [2021-11-23 03:43:10,954 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertEXIT(lines 14 20) no Hoare annotation was computed. [2021-11-23 03:43:10,955 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2021-11-23 03:43:10,958 INFO L732 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1] [2021-11-23 03:43:10,959 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-23 03:43:10,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 03:43:10 BoogieIcfgContainer [2021-11-23 03:43:10,992 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-23 03:43:10,993 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-23 03:43:10,993 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-23 03:43:10,993 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-23 03:43:10,993 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:42:53" (3/4) ... [2021-11-23 03:43:10,996 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-23 03:43:11,002 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2021-11-23 03:43:11,007 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2021-11-23 03:43:11,007 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-11-23 03:43:11,008 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-23 03:43:11,008 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-23 03:43:11,050 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/witness.graphml [2021-11-23 03:43:11,051 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-23 03:43:11,051 INFO L158 Benchmark]: Toolchain (without parser) took 18681.42ms. Allocated memory was 88.1MB in the beginning and 188.7MB in the end (delta: 100.7MB). Free memory was 52.0MB in the beginning and 79.0MB in the end (delta: -27.0MB). Peak memory consumption was 73.9MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,052 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 88.1MB. Free memory is still 68.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:43:11,052 INFO L158 Benchmark]: CACSL2BoogieTranslator took 302.45ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 51.8MB in the beginning and 83.4MB in the end (delta: -31.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,053 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.61ms. Allocated memory is still 107.0MB. Free memory was 83.4MB in the beginning and 81.8MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,053 INFO L158 Benchmark]: Boogie Preprocessor took 44.12ms. Allocated memory is still 107.0MB. Free memory was 81.8MB in the beginning and 81.0MB in the end (delta: 813.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:43:11,054 INFO L158 Benchmark]: RCFGBuilder took 349.76ms. Allocated memory is still 107.0MB. Free memory was 81.0MB in the beginning and 71.3MB in the end (delta: 9.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,055 INFO L158 Benchmark]: TraceAbstraction took 17880.64ms. Allocated memory was 107.0MB in the beginning and 188.7MB in the end (delta: 81.8MB). Free memory was 70.9MB in the beginning and 81.1MB in the end (delta: -10.2MB). Peak memory consumption was 74.4MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,055 INFO L158 Benchmark]: Witness Printer took 58.36ms. Allocated memory is still 188.7MB. Free memory was 81.1MB in the beginning and 79.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 03:43:11,058 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 88.1MB. Free memory is still 68.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 302.45ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 51.8MB in the beginning and 83.4MB in the end (delta: -31.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.61ms. Allocated memory is still 107.0MB. Free memory was 83.4MB in the beginning and 81.8MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 44.12ms. Allocated memory is still 107.0MB. Free memory was 81.8MB in the beginning and 81.0MB in the end (delta: 813.2kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 349.76ms. Allocated memory is still 107.0MB. Free memory was 81.0MB in the beginning and 71.3MB in the end (delta: 9.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 17880.64ms. Allocated memory was 107.0MB in the beginning and 188.7MB in the end (delta: 81.8MB). Free memory was 70.9MB in the beginning and 81.1MB in the end (delta: -10.2MB). Peak memory consumption was 74.4MB. Max. memory is 16.1GB. * Witness Printer took 58.36ms. Allocated memory is still 188.7MB. Free memory was 81.1MB in the beginning and 79.0MB in the end (delta: 2.1MB). 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: 17]: 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, 14 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 17.8s, OverallIterations: 6, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 5.6s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 25 SdHoareTripleChecker+Valid, 0.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 23 mSDsluCounter, 186 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 132 mSDsCounter, 10 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 121 IncrementalHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 10 mSolverCounterUnsat, 61 mSDtfsCounter, 121 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 167 GetRequests, 112 SyntacticMatches, 10 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 4.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=5, InterpolantAutomatonStates: 30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 13 PreInvPairs, 22 NumberOfFragments, 368 HoareAnnotationTreeSize, 13 FomulaSimplifications, 12 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 5 FomulaSimplificationsInter, 1392 FormulaSimplificationTreeSizeReductionInter, 5.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.8s InterpolantComputationTime, 73 NumberOfCodeBlocks, 65 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 117 ConstructedInterpolants, 0 QuantifiedInterpolants, 512 SizeOfPredicates, 9 NumberOfNonLiveVariables, 267 ConjunctsInSsa, 35 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 38/50 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: OVERALL_TIME: 1.3s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 2, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 12, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 18, TOOLS_POST_TIME: 0.5s, TOOLS_POST_CALL_APPLICATIONS: 7, TOOLS_POST_CALL_TIME: 0.6s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 31, TOOLS_QUANTIFIERELIM_TIME: 1.2s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.2s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 45, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 6, DOMAIN_JOIN_TIME: 0.1s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 1, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 2, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 12, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME: 0.6s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.6s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 2, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 1, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 79, DAG_COMPRESSION_RETAINED_NODES: 40, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 44]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 34]: Loop Invariant Derived loop invariant: ((((((((((((0 <= k + 2147483648 && z <= 2147483647) && 0 <= z + 2147483648) && 1 <= c) && k <= 2147483647) && 0 <= counter) && #NULL <= 0) && (((x == 1 && y == 0) && z == 0) || (((y % z == 0 && !(z == 0)) && y / z * z + (-1 + x) / z == z * ((-1 + x) / z) + 1) && (-1 + x) % z == 0))) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown) && counter <= 2) && c <= 3) && #NULL == 0) || ((((((((((((0 <= k + 2147483648 && z <= 2147483647) && 0 <= z + 2147483648) && 1 <= c) && k <= 2147483647) && #NULL <= 0) && y == 1) && counter == 0) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown) && y * z + x == x * z + 1) && c <= 3) && #NULL == 0) RESULT: Ultimate proved your program to be correct! [2021-11-23 03:43:11,095 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd1bb24-c54d-4ddd-a9bb-53fdbc483ab2/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE