./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta --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 820aaba80b9c7e4ca2ad4a6a908bac2e6f59545dc6a131cb9fae6306b993a9eb --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:40:48,781 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:40:48,783 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:40:48,815 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:40:48,816 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:40:48,817 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:40:48,819 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:40:48,821 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:40:48,824 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:40:48,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:40:48,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:40:48,828 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:40:48,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:40:48,830 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:40:48,833 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:40:48,835 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:40:48,837 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:40:48,843 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:40:48,846 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:40:48,849 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:40:48,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:40:48,855 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:40:48,859 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:40:48,861 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:40:48,870 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:40:48,875 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:40:48,875 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:40:48,877 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:40:48,878 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:40:48,880 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:40:48,880 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:40:48,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:40:48,885 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:40:48,887 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:40:48,888 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:40:48,888 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:40:48,889 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:40:48,890 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:40:48,890 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:40:48,891 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:40:48,892 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:40:48,893 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:40:48,937 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:40:48,937 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:40:48,938 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:40:48,938 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:40:48,939 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:40:48,939 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:40:48,940 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:40:48,940 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:40:48,940 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:40:48,940 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:40:48,941 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:40:48,942 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:40:48,942 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:40:48,942 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:40:48,943 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:40:48,943 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:40:48,943 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:40:48,943 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:40:48,944 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:40:48,944 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:40:48,945 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:40:48,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:40:48,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:40:48,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:40:48,946 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:40:48,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:40:48,946 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:40:48,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:40:48,947 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:40:48,947 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:40:48,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:40:48,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:40:48,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:40:48,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:40:48,948 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:40:48,949 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:40:48,949 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:40:48,949 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:40:48,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:40:48,950 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:40:48,950 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:40:48,950 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 820aaba80b9c7e4ca2ad4a6a908bac2e6f59545dc6a131cb9fae6306b993a9eb [2022-10-17 17:40:49,304 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:40:49,354 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:40:49,357 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:40:49,358 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:40:49,363 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:40:49,365 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2022-10-17 17:40:49,436 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/data/c0ec665e0/17d8585a549b46d59c7ca18b28880459/FLAG13d28cbd4 [2022-10-17 17:40:49,974 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:40:49,980 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2022-10-17 17:40:49,988 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/data/c0ec665e0/17d8585a549b46d59c7ca18b28880459/FLAG13d28cbd4 [2022-10-17 17:40:50,340 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/data/c0ec665e0/17d8585a549b46d59c7ca18b28880459 [2022-10-17 17:40:50,342 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:40:50,345 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:40:50,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:40:50,350 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:40:50,353 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:40:50,354 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4739ca8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50, skipping insertion in model container [2022-10-17 17:40:50,357 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:40:50,384 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:40:50,589 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_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c[588,601] [2022-10-17 17:40:50,616 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:40:50,626 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:40:50,638 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_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c[588,601] [2022-10-17 17:40:50,649 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:40:50,664 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:40:50,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50 WrapperNode [2022-10-17 17:40:50,665 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:40:50,667 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:40:50,667 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:40:50,667 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:40:50,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,686 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,714 INFO L138 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 49 [2022-10-17 17:40:50,715 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:40:50,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:40:50,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:40:50,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:40:50,727 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,727 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,740 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,745 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,754 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,755 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,756 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,758 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:40:50,759 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:40:50,759 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:40:50,759 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:40:50,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (1/1) ... [2022-10-17 17:40:50,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:40:50,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:50,799 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:40:50,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:40:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:40:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:40:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:40:50,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:40:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-10-17 17:40:50,851 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-10-17 17:40:50,915 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:40:50,917 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:40:51,200 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:40:51,220 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:40:51,220 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-10-17 17:40:51,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:40:51 BoogieIcfgContainer [2022-10-17 17:40:51,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:40:51,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:40:51,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:40:51,229 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:40:51,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:40:50" (1/3) ... [2022-10-17 17:40:51,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1decba93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:40:51, skipping insertion in model container [2022-10-17 17:40:51,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:50" (2/3) ... [2022-10-17 17:40:51,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1decba93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:40:51, skipping insertion in model container [2022-10-17 17:40:51,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:40:51" (3/3) ... [2022-10-17 17:40:51,232 INFO L112 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound20.c [2022-10-17 17:40:51,252 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:40:51,252 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:40:51,303 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:40:51,310 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@10715c14, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:40:51,311 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:40:51,315 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-10-17 17:40:51,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 17:40:51,334 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:51,334 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 17:40:51,335 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:51,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:51,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1408153759, now seen corresponding path program 1 times [2022-10-17 17:40:51,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:51,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668762515] [2022-10-17 17:40:51,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:51,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:51,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:51,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:51,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:51,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668762515] [2022-10-17 17:40:51,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668762515] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:51,548 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:51,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:40:51,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631028176] [2022-10-17 17:40:51,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:51,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-10-17 17:40:51,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:51,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-10-17 17:40:51,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-17 17:40:51,633 INFO L87 Difference]: Start difference. First operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) 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) [2022-10-17 17:40:51,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:51,686 INFO L93 Difference]: Finished difference Result 45 states and 82 transitions. [2022-10-17 17:40:51,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-17 17:40:51,688 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 [2022-10-17 17:40:51,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:51,699 INFO L225 Difference]: With dead ends: 45 [2022-10-17 17:40:51,699 INFO L226 Difference]: Without dead ends: 21 [2022-10-17 17:40:51,705 INFO L412 NwaCegarLoop]: 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 [2022-10-17 17:40:51,712 INFO L413 NwaCegarLoop]: 32 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, 32 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 [2022-10-17 17:40:51,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:40:51,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-10-17 17:40:51,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-10-17 17:40:51,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:40:51,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 32 transitions. [2022-10-17 17:40:51,774 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 32 transitions. Word has length 6 [2022-10-17 17:40:51,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:51,774 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 32 transitions. [2022-10-17 17:40:51,775 INFO L496 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) [2022-10-17 17:40:51,775 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 32 transitions. [2022-10-17 17:40:51,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:40:51,777 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:51,777 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:51,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:40:51,778 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:51,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:51,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1232571916, now seen corresponding path program 1 times [2022-10-17 17:40:51,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:51,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816633168] [2022-10-17 17:40:51,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:51,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:51,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:51,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:51,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:51,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816633168] [2022-10-17 17:40:51,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816633168] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:51,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:51,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:51,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061791166] [2022-10-17 17:40:51,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:51,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:40:51,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:51,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:40:51,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:40:51,942 INFO L87 Difference]: Start difference. First operand 21 states and 32 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) [2022-10-17 17:40:51,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:51,969 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2022-10-17 17:40:51,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:40:51,971 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 [2022-10-17 17:40:51,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:51,974 INFO L225 Difference]: With dead ends: 35 [2022-10-17 17:40:51,974 INFO L226 Difference]: Without dead ends: 23 [2022-10-17 17:40:51,975 INFO L412 NwaCegarLoop]: 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 [2022-10-17 17:40:51,977 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 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 [2022-10-17 17:40:51,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:40:51,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-10-17 17:40:51,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-10-17 17:40:51,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:40:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 34 transitions. [2022-10-17 17:40:51,992 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 34 transitions. Word has length 7 [2022-10-17 17:40:51,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:51,993 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 34 transitions. [2022-10-17 17:40:51,993 INFO L496 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) [2022-10-17 17:40:51,993 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 34 transitions. [2022-10-17 17:40:51,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:40:51,994 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:51,994 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:51,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:40:51,995 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:51,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:51,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1231022784, now seen corresponding path program 1 times [2022-10-17 17:40:51,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:51,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774539589] [2022-10-17 17:40:51,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:51,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:52,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:52,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:52,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:52,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774539589] [2022-10-17 17:40:52,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774539589] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:52,190 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:52,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:40:52,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128358497] [2022-10-17 17:40:52,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:52,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:52,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:52,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:52,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:52,193 INFO L87 Difference]: Start difference. First operand 23 states and 34 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) [2022-10-17 17:40:52,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:52,303 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-10-17 17:40:52,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:40:52,308 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 [2022-10-17 17:40:52,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:52,309 INFO L225 Difference]: With dead ends: 29 [2022-10-17 17:40:52,309 INFO L226 Difference]: Without dead ends: 27 [2022-10-17 17:40:52,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:52,311 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:52,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 55 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:52,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-10-17 17:40:52,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-10-17 17:40:52,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:40:52,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2022-10-17 17:40:52,340 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 7 [2022-10-17 17:40:52,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:52,341 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2022-10-17 17:40:52,341 INFO L496 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) [2022-10-17 17:40:52,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2022-10-17 17:40:52,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-10-17 17:40:52,345 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:52,345 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:52,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:40:52,346 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:52,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:52,347 INFO L85 PathProgramCache]: Analyzing trace with hash -1004679035, now seen corresponding path program 1 times [2022-10-17 17:40:52,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:52,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267668517] [2022-10-17 17:40:52,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:52,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:52,367 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:40:52,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [700961079] [2022-10-17 17:40:52,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:52,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:52,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:52,370 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:52,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:40:52,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:52,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:40:52,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:52,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:52,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:52,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:52,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267668517] [2022-10-17 17:40:52,504 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:40:52,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700961079] [2022-10-17 17:40:52,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700961079] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:52,504 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:52,504 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:40:52,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514296062] [2022-10-17 17:40:52,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:52,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:52,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:52,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:52,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:52,507 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:40:52,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:52,633 INFO L93 Difference]: Finished difference Result 45 states and 65 transitions. [2022-10-17 17:40:52,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:40:52,635 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-10-17 17:40:52,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:52,637 INFO L225 Difference]: With dead ends: 45 [2022-10-17 17:40:52,637 INFO L226 Difference]: Without dead ends: 43 [2022-10-17 17:40:52,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:52,641 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:52,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 114 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:52,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-10-17 17:40:52,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2022-10-17 17:40:52,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-10-17 17:40:52,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-10-17 17:40:52,656 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2022-10-17 17:40:52,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:52,657 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-10-17 17:40:52,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:40:52,657 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-10-17 17:40:52,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:40:52,658 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:52,658 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:52,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:40:52,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:52,871 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:52,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:52,872 INFO L85 PathProgramCache]: Analyzing trace with hash 752381984, now seen corresponding path program 1 times [2022-10-17 17:40:52,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:52,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420015198] [2022-10-17 17:40:52,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:52,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:52,885 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:40:52,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1433960315] [2022-10-17 17:40:52,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:52,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:52,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:52,903 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:52,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:40:52,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:52,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:40:52,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:53,052 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 17:40:53,052 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:53,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:53,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420015198] [2022-10-17 17:40:53,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:40:53,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433960315] [2022-10-17 17:40:53,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1433960315] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:53,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:53,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:40:53,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574622779] [2022-10-17 17:40:53,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:53,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:53,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:53,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:53,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:53,056 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:40:53,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:53,163 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2022-10-17 17:40:53,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:40:53,164 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-10-17 17:40:53,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:53,167 INFO L225 Difference]: With dead ends: 49 [2022-10-17 17:40:53,167 INFO L226 Difference]: Without dead ends: 47 [2022-10-17 17:40:53,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:53,169 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:53,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 120 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:53,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-10-17 17:40:53,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-10-17 17:40:53,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-10-17 17:40:53,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 59 transitions. [2022-10-17 17:40:53,185 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 59 transitions. Word has length 17 [2022-10-17 17:40:53,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:53,185 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 59 transitions. [2022-10-17 17:40:53,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:40:53,186 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 59 transitions. [2022-10-17 17:40:53,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-10-17 17:40:53,187 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:53,187 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:53,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:40:53,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:53,411 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:53,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:53,412 INFO L85 PathProgramCache]: Analyzing trace with hash -2088406747, now seen corresponding path program 1 times [2022-10-17 17:40:53,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:53,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203565897] [2022-10-17 17:40:53,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:53,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:53,437 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:40:53,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1203230151] [2022-10-17 17:40:53,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:53,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:53,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:53,447 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:53,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:40:53,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:53,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2022-10-17 17:40:53,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:53,606 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-10-17 17:40:53,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:53,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:53,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203565897] [2022-10-17 17:40:53,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:40:53,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203230151] [2022-10-17 17:40:53,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203230151] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:53,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:53,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:40:53,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442115536] [2022-10-17 17:40:53,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:53,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:53,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:53,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:53,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:53,609 INFO L87 Difference]: Start difference. First operand 43 states and 59 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-10-17 17:40:53,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:53,711 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-10-17 17:40:53,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:40:53,712 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2022-10-17 17:40:53,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:53,713 INFO L225 Difference]: With dead ends: 57 [2022-10-17 17:40:53,713 INFO L226 Difference]: Without dead ends: 45 [2022-10-17 17:40:53,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:53,715 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:53,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 103 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:53,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-10-17 17:40:53,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-10-17 17:40:53,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:40:53,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2022-10-17 17:40:53,730 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2022-10-17 17:40:53,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:53,730 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2022-10-17 17:40:53,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-10-17 17:40:53,730 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2022-10-17 17:40:53,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-10-17 17:40:53,732 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:53,732 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:53,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:40:53,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:53,947 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:53,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:53,948 INFO L85 PathProgramCache]: Analyzing trace with hash 204620983, now seen corresponding path program 1 times [2022-10-17 17:40:53,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:53,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634124103] [2022-10-17 17:40:53,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:53,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:53,974 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:40:53,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [89862926] [2022-10-17 17:40:53,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:53,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:53,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:53,991 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:54,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:40:54,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:54,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2022-10-17 17:40:54,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:54,129 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-10-17 17:40:54,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:40:54,190 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:40:54,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:54,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634124103] [2022-10-17 17:40:54,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:40:54,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89862926] [2022-10-17 17:40:54,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89862926] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:40:54,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943732033] [2022-10-17 17:40:54,212 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-10-17 17:40:54,212 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:40:54,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:40:54,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:40:54,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:40:58,818 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-10-17 17:40:58,824 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:41:04,419 WARN L233 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 123 DAG size of output: 106 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-10-17 17:41:06,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1154#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:41:06,306 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:41:06,307 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:41:06,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-10-17 17:41:06,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906033298] [2022-10-17 17:41:06,307 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:41:06,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:41:06,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:41:06,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:41:06,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2022-10-17 17:41:06,309 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-10-17 17:41:06,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:41:06,523 INFO L93 Difference]: Finished difference Result 115 states and 150 transitions. [2022-10-17 17:41:06,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-10-17 17:41:06,524 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 40 [2022-10-17 17:41:06,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:41:06,528 INFO L225 Difference]: With dead ends: 115 [2022-10-17 17:41:06,529 INFO L226 Difference]: Without dead ends: 99 [2022-10-17 17:41:06,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-10-17 17:41:06,532 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 63 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:41:06,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 168 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:41:06,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-10-17 17:41:06,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2022-10-17 17:41:06,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 49 states have internal predecessors, (53), 38 states have call successors, (38), 10 states have call predecessors, (38), 10 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:41:06,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 126 transitions. [2022-10-17 17:41:06,576 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 126 transitions. Word has length 40 [2022-10-17 17:41:06,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:41:06,577 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 126 transitions. [2022-10-17 17:41:06,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-10-17 17:41:06,579 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 126 transitions. [2022-10-17 17:41:06,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-10-17 17:41:06,583 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:41:06,583 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:41:06,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:41:06,807 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:41:06,807 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:41:06,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:41:06,808 INFO L85 PathProgramCache]: Analyzing trace with hash 696736299, now seen corresponding path program 1 times [2022-10-17 17:41:06,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:41:06,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326391659] [2022-10-17 17:41:06,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:41:06,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:41:06,818 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:41:06,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1872440615] [2022-10-17 17:41:06,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:41:06,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:41:06,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:41:06,827 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:41:06,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:41:06,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:41:06,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:41:06,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:41:06,977 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:41:06,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:41:07,068 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:41:07,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:41:07,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326391659] [2022-10-17 17:41:07,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:41:07,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872440615] [2022-10-17 17:41:07,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872440615] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:41:07,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469564401] [2022-10-17 17:41:07,078 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:41:07,079 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:41:07,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:41:07,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:41:07,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:41:10,736 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:41:10,749 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:41:11,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1740#(and (<= |#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 [2022-10-17 17:41:11,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:41:11,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:41:11,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-10-17 17:41:11,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297330618] [2022-10-17 17:41:11,539 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:41:11,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:41:11,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:41:11,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:41:11,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:41:11,541 INFO L87 Difference]: Start difference. First operand 95 states and 126 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-10-17 17:41:11,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:41:11,880 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2022-10-17 17:41:11,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:41:11,880 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 40 [2022-10-17 17:41:11,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:41:11,882 INFO L225 Difference]: With dead ends: 113 [2022-10-17 17:41:11,882 INFO L226 Difference]: Without dead ends: 111 [2022-10-17 17:41:11,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2022-10-17 17:41:11,884 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:41:11,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 88 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 17:41:11,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-10-17 17:41:11,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-10-17 17:41:11,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 61 states have internal predecessors, (65), 38 states have call successors, (38), 14 states have call predecessors, (38), 14 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:41:11,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 138 transitions. [2022-10-17 17:41:11,917 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 138 transitions. Word has length 40 [2022-10-17 17:41:11,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:41:11,917 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 138 transitions. [2022-10-17 17:41:11,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-10-17 17:41:11,918 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 138 transitions. [2022-10-17 17:41:11,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-10-17 17:41:11,919 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:41:11,919 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:41:11,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:41:12,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-10-17 17:41:12,135 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:41:12,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:41:12,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1539244486, now seen corresponding path program 2 times [2022-10-17 17:41:12,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:41:12,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603931801] [2022-10-17 17:41:12,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:41:12,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:41:12,147 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:41:12,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1427952731] [2022-10-17 17:41:12,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:41:12,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:41:12,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:41:12,148 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:41:12,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-10-17 17:41:12,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-10-17 17:41:12,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:41:12,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:41:12,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:41:12,311 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-10-17 17:41:12,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:41:12,399 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-10-17 17:41:12,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:41:12,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603931801] [2022-10-17 17:41:12,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:41:12,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427952731] [2022-10-17 17:41:12,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427952731] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:41:12,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054881513] [2022-10-17 17:41:12,403 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:41:12,403 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:41:12,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:41:12,404 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:41:12,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:41:15,291 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-10-17 17:41:15,295 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:41:22,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2368#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:41:22,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:41:22,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:41:22,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-10-17 17:41:22,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764749465] [2022-10-17 17:41:22,619 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:41:22,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:41:22,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:41:22,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:41:22,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:41:22,621 INFO L87 Difference]: Start difference. First operand 111 states and 138 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-10-17 17:41:22,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:41:22,809 INFO L93 Difference]: Finished difference Result 117 states and 143 transitions. [2022-10-17 17:41:22,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:41:22,810 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 45 [2022-10-17 17:41:22,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:41:22,814 INFO L225 Difference]: With dead ends: 117 [2022-10-17 17:41:22,814 INFO L226 Difference]: Without dead ends: 115 [2022-10-17 17:41:22,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2022-10-17 17:41:22,818 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:41:22,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 157 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:41:22,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-10-17 17:41:22,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-10-17 17:41:22,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 64 states have internal predecessors, (68), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:41:22,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 141 transitions. [2022-10-17 17:41:22,866 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 141 transitions. Word has length 45 [2022-10-17 17:41:22,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:41:22,867 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 141 transitions. [2022-10-17 17:41:22,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-10-17 17:41:22,867 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 141 transitions. [2022-10-17 17:41:22,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-10-17 17:41:22,870 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:41:22,870 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:41:22,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-10-17 17:41:23,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:41:23,071 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:41:23,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:41:23,071 INFO L85 PathProgramCache]: Analyzing trace with hash -375151797, now seen corresponding path program 3 times [2022-10-17 17:41:23,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:41:23,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599127148] [2022-10-17 17:41:23,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:41:23,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:41:23,082 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:41:23,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [471699839] [2022-10-17 17:41:23,083 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:41:23,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:41:23,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:41:23,084 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:41:23,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0e1b3c4f-c109-49d2-8a7d-5141e39c5eb2/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-10-17 17:41:23,140 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:41:23,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:41:23,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 17 conjunts are in the unsatisfiable core [2022-10-17 17:41:23,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:41:23,262 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-10-17 17:41:23,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:41:23,445 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-10-17 17:41:23,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:41:23,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599127148] [2022-10-17 17:41:23,445 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:41:23,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471699839] [2022-10-17 17:41:23,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471699839] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:41:23,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020040575] [2022-10-17 17:41:23,448 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:41:23,448 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:41:23,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:41:23,449 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:41:23,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs