./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/simple_1-1.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_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/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_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/simple_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/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_d6ca5556-dffc-471e-b858-129baacd0ac5/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 311ca7a26a816b19bf2f80b95fa3e10e4e95b99dff1e77c10bd7566050baa8ec --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:03:36,810 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:03:36,813 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:03:36,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:03:36,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:03:36,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:03:36,887 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:03:36,891 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:03:36,894 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:03:36,899 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:03:36,901 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:03:36,903 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:03:36,903 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:03:36,906 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:03:36,908 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:03:36,913 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:03:36,915 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:03:36,917 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:03:36,919 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:03:36,929 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:03:36,932 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:03:36,933 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:03:36,937 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:03:36,938 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:03:36,942 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:03:36,942 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:03:36,943 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:03:36,945 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:03:36,946 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:03:36,947 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:03:36,948 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:03:36,949 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:03:36,951 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:03:36,953 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:03:36,954 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:03:36,955 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:03:36,955 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:03:36,956 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:03:36,956 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:03:36,957 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:03:36,958 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:03:36,959 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:03:37,006 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:03:37,006 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:03:37,007 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:03:37,007 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:03:37,015 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:03:37,015 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:03:37,015 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:03:37,016 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:03:37,016 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:03:37,016 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:03:37,017 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:03:37,018 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:03:37,018 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:03:37,018 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:03:37,018 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:03:37,019 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:03:37,019 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:03:37,019 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:03:37,020 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:03:37,020 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:03:37,020 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:03:37,021 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:03:37,021 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:03:37,021 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:03:37,021 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:03:37,022 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:03:37,023 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:03:37,024 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:03:37,024 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:03:37,024 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:03:37,024 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:03:37,025 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:03:37,025 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:37,026 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:03:37,026 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:03:37,026 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:03:37,026 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:03:37,026 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:03:37,027 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:03:37,027 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:03:37,027 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:03:37,027 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_d6ca5556-dffc-471e-b858-129baacd0ac5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 311ca7a26a816b19bf2f80b95fa3e10e4e95b99dff1e77c10bd7566050baa8ec [2021-11-23 02:03:37,366 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:03:37,387 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:03:37,390 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:03:37,391 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:03:37,392 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:03:37,393 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/loop-acceleration/simple_1-1.c [2021-11-23 02:03:37,467 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/data/e25765753/71a97b53b5f644e3b0aac08a24d83c9b/FLAG94e84a0a8 [2021-11-23 02:03:37,951 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:03:37,962 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/sv-benchmarks/c/loop-acceleration/simple_1-1.c [2021-11-23 02:03:37,968 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/data/e25765753/71a97b53b5f644e3b0aac08a24d83c9b/FLAG94e84a0a8 [2021-11-23 02:03:38,333 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/data/e25765753/71a97b53b5f644e3b0aac08a24d83c9b [2021-11-23 02:03:38,337 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:03:38,340 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:03:38,367 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:38,368 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:03:38,372 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:03:38,373 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,376 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fa503e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38, skipping insertion in model container [2021-11-23 02:03:38,377 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,382 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:03:38,396 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:03:38,579 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_d6ca5556-dffc-471e-b858-129baacd0ac5/sv-benchmarks/c/loop-acceleration/simple_1-1.c[322,335] [2021-11-23 02:03:38,588 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:38,597 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:03:38,610 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_d6ca5556-dffc-471e-b858-129baacd0ac5/sv-benchmarks/c/loop-acceleration/simple_1-1.c[322,335] [2021-11-23 02:03:38,612 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:38,626 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:03:38,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38 WrapperNode [2021-11-23 02:03:38,626 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:38,628 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:38,628 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:03:38,628 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:03:38,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,643 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,661 INFO L137 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 23 [2021-11-23 02:03:38,661 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:38,662 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:03:38,663 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:03:38,663 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:03:38,672 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,672 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,673 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,674 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,676 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,680 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,681 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,683 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:03:38,684 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:03:38,684 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:03:38,684 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:03:38,685 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (1/1) ... [2021-11-23 02:03:38,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:38,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:38,720 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:03:38,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:03:38,762 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:03:38,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:03:38,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:03:38,763 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:03:38,820 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:03:38,822 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:03:38,910 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:03:38,927 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:03:38,930 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:03:38,933 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:38 BoogieIcfgContainer [2021-11-23 02:03:38,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:03:38,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:03:38,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:03:38,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:03:38,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:03:38" (1/3) ... [2021-11-23 02:03:38,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40886ba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:38, skipping insertion in model container [2021-11-23 02:03:38,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:38" (2/3) ... [2021-11-23 02:03:38,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40886ba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:38, skipping insertion in model container [2021-11-23 02:03:38,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:38" (3/3) ... [2021-11-23 02:03:38,945 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_1-1.c [2021-11-23 02:03:38,956 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:03:38,957 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:03:39,028 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:03:39,042 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 02:03:39,042 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:03:39,062 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:39,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-23 02:03:39,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:39,093 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-23 02:03:39,094 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:39,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:39,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1850503, now seen corresponding path program 1 times [2021-11-23 02:03:39,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:39,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457771696] [2021-11-23 02:03:39,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:39,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:39,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:39,346 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 02:03:39,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:39,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457771696] [2021-11-23 02:03:39,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457771696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:39,349 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:39,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:03:39,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379282835] [2021-11-23 02:03:39,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:39,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:39,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:39,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:39,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:03:39,402 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 02:03:39,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:39,461 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2021-11-23 02:03:39,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:39,471 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-23 02:03:39,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:39,478 INFO L225 Difference]: With dead ends: 13 [2021-11-23 02:03:39,479 INFO L226 Difference]: Without dead ends: 6 [2021-11-23 02:03:39,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:03:39,489 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:39,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:03:39,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2021-11-23 02:03:39,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2021-11-23 02:03:39,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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 02:03:39,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2021-11-23 02:03:39,539 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2021-11-23 02:03:39,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:39,540 INFO L470 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2021-11-23 02:03:39,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 02:03:39,541 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2021-11-23 02:03:39,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-23 02:03:39,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:39,541 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-23 02:03:39,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:03:39,543 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:39,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:39,549 INFO L85 PathProgramCache]: Analyzing trace with hash 56695734, now seen corresponding path program 1 times [2021-11-23 02:03:39,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:39,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100997239] [2021-11-23 02:03:39,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:39,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:39,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:39,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:39,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:39,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100997239] [2021-11-23 02:03:39,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100997239] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:39,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280598048] [2021-11-23 02:03:39,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:39,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:39,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:39,692 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:39,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:03:39,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:39,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:03:39,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:39,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:39,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:39,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:39,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280598048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:39,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310697176] [2021-11-23 02:03:39,898 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-23 02:03:39,898 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:39,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:39,911 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:39,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:40,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:03:40,210 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69#(and (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:03:40,210 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:03:40,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:03:40,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-23 02:03:40,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835184309] [2021-11-23 02:03:40,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:40,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:03:40,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:40,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:03:40,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:03:40,214 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 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 02:03:40,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:40,267 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2021-11-23 02:03:40,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:03:40,274 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-23 02:03:40,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:40,275 INFO L225 Difference]: With dead ends: 12 [2021-11-23 02:03:40,276 INFO L226 Difference]: Without dead ends: 9 [2021-11-23 02:03:40,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:03:40,279 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:40,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:03:40,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-23 02:03:40,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-23 02:03:40,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:40,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-23 02:03:40,292 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2021-11-23 02:03:40,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:40,292 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-23 02:03:40,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 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 02:03:40,293 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-23 02:03:40,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:03:40,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:40,295 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2021-11-23 02:03:40,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:40,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:40,511 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:40,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:40,512 INFO L85 PathProgramCache]: Analyzing trace with hash 435294279, now seen corresponding path program 2 times [2021-11-23 02:03:40,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:40,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892750650] [2021-11-23 02:03:40,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:40,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:40,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:40,634 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:40,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:40,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892750650] [2021-11-23 02:03:40,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892750650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:40,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149727701] [2021-11-23 02:03:40,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:03:40,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:40,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:40,637 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:40,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:03:40,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:03:40,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:40,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:03:40,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:40,789 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:40,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:40,890 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:40,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149727701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:40,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151340135] [2021-11-23 02:03:40,893 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-23 02:03:40,894 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:40,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:40,894 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:40,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:40,960 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:03:41,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '160#(and (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:03:41,070 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:03:41,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:03:41,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-23 02:03:41,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435548542] [2021-11-23 02:03:41,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:41,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:03:41,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:41,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:03:41,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:03:41,073 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:41,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:41,453 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-23 02:03:41,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:03:41,455 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 02:03:41,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:41,455 INFO L225 Difference]: With dead ends: 18 [2021-11-23 02:03:41,456 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 02:03:41,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:03:41,458 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:41,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:03:41,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 02:03:41,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-23 02:03:41,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:41,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-11-23 02:03:41,463 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2021-11-23 02:03:41,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:41,463 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-11-23 02:03:41,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:41,464 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-11-23 02:03:41,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:03:41,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:41,465 INFO L514 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2021-11-23 02:03:41,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:41,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 02:03:41,665 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:41,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:41,666 INFO L85 PathProgramCache]: Analyzing trace with hash 2046822887, now seen corresponding path program 3 times [2021-11-23 02:03:41,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:41,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366351310] [2021-11-23 02:03:41,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:41,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:41,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:41,894 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:41,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:41,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366351310] [2021-11-23 02:03:41,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366351310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:41,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309610174] [2021-11-23 02:03:41,895 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:41,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:41,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:41,897 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:41,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:03:41,938 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:41,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:41,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:03:41,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:42,062 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:42,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:42,425 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:42,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309610174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:42,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029798760] [2021-11-23 02:03:42,427 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-23 02:03:42,427 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:42,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:42,428 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:42,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:42,499 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:03:42,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '329#(and (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:03:42,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:03:42,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:03:42,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-23 02:03:42,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234877811] [2021-11-23 02:03:42,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:42,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:03:42,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:42,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:03:42,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:03:42,668 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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 02:03:48,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:48,210 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2021-11-23 02:03:48,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:03:48,211 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-23 02:03:48,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:48,212 INFO L225 Difference]: With dead ends: 30 [2021-11-23 02:03:48,212 INFO L226 Difference]: Without dead ends: 27 [2021-11-23 02:03:48,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=449, Invalid=957, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:03:48,215 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:48,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:48,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-23 02:03:48,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-23 02:03:48,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:48,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-11-23 02:03:48,223 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2021-11-23 02:03:48,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:48,223 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-11-23 02:03:48,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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 02:03:48,224 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-11-23 02:03:48,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:03:48,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:48,225 INFO L514 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2021-11-23 02:03:48,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:48,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:48,426 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:48,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:48,426 INFO L85 PathProgramCache]: Analyzing trace with hash 328783143, now seen corresponding path program 4 times [2021-11-23 02:03:48,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:48,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232580960] [2021-11-23 02:03:48,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:48,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:48,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:49,015 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:49,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:49,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232580960] [2021-11-23 02:03:49,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232580960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:49,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230813392] [2021-11-23 02:03:49,016 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:03:49,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:49,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:49,017 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:49,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:03:49,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:49,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 02:03:49,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:49,280 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:49,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:50,730 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:50,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230813392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:50,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1756128153] [2021-11-23 02:03:50,733 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-23 02:03:50,734 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:50,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:50,734 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:50,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:50,816 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:03:51,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '654#(and (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:03:51,108 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:03:51,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:03:51,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-23 02:03:51,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993728315] [2021-11-23 02:03:51,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:51,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 02:03:51,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:51,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 02:03:51,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=679, Invalid=1973, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:03:51,113 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:04:02,366 WARN L227 SmtUtils]: Spent 5.24s on a formula simplification. DAG size of input: 94 DAG size of output: 10 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:04:41,723 WARN L227 SmtUtils]: Spent 5.71s on a formula simplification. DAG size of input: 82 DAG size of output: 10 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:06:42,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:42,351 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2021-11-23 02:06:42,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-23 02:06:42,352 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 02:06:42,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:42,353 INFO L225 Difference]: With dead ends: 54 [2021-11-23 02:06:42,353 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:06:42,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 172.7s TimeCoverageRelationStatistics Valid=1752, Invalid=3645, Unknown=5, NotChecked=0, Total=5402 [2021-11-23 02:06:42,357 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 584 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:42,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 50 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 584 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:06:42,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:06:42,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-23 02:06:42,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:42,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-11-23 02:06:42,368 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2021-11-23 02:06:42,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:42,369 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-11-23 02:06:42,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:42,369 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-11-23 02:06:42,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:06:42,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:42,371 INFO L514 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2021-11-23 02:06:42,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:42,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:42,587 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:42,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:42,587 INFO L85 PathProgramCache]: Analyzing trace with hash 987089831, now seen corresponding path program 5 times [2021-11-23 02:06:42,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:42,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005089820] [2021-11-23 02:06:42,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:42,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:42,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:44,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:44,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:44,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005089820] [2021-11-23 02:06:44,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005089820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:44,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82949375] [2021-11-23 02:06:44,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:06:44,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:44,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:44,055 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:44,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6ca5556-dffc-471e-b858-129baacd0ac5/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:06:46,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-23 02:06:46,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:06:46,391 WARN L261 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-23 02:06:46,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:46,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:46,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:53,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:53,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82949375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:53,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973222869] [2021-11-23 02:06:53,466 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-23 02:06:53,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:06:53,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:06:53,467 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:06:53,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:06:53,509 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:06:53,971 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1292#(and (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:06:53,971 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:06:53,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:06:53,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 49] total 97 [2021-11-23 02:06:53,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495041422] [2021-11-23 02:06:53,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:06:53,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 02:06:53,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:53,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 02:06:53,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2505, Invalid=7595, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:06:53,979 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 98 states, 98 states have (on average 1.030612244897959) internal successors, (101), 97 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:30,457 WARN L227 SmtUtils]: Spent 31.95s on a formula simplification. DAG size of input: 241 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:08:37,805 WARN L227 SmtUtils]: Spent 49.79s on a formula simplification. DAG size of input: 244 DAG size of output: 20 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:09:14,747 WARN L227 SmtUtils]: Spent 26.10s on a formula simplification. DAG size of input: 236 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:09:57,464 WARN L227 SmtUtils]: Spent 31.29s on a formula simplification. DAG size of input: 231 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:10:46,908 WARN L227 SmtUtils]: Spent 30.36s on a formula simplification. DAG size of input: 226 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:11:34,255 WARN L227 SmtUtils]: Spent 27.30s on a formula simplification. DAG size of input: 221 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:12:33,161 WARN L227 SmtUtils]: Spent 34.06s on a formula simplification. DAG size of input: 216 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:13:19,941 WARN L227 SmtUtils]: Spent 20.08s on a formula simplification. DAG size of input: 211 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:14:11,714 WARN L227 SmtUtils]: Spent 18.17s on a formula simplification. DAG size of input: 206 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:15:30,130 WARN L227 SmtUtils]: Spent 44.48s on a formula simplification. DAG size of input: 201 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:16:40,618 WARN L227 SmtUtils]: Spent 37.46s on a formula simplification. DAG size of input: 196 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:17:45,771 WARN L227 SmtUtils]: Spent 28.82s on a formula simplification. DAG size of input: 191 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)