./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/modn.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/modn.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9 --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 b1b107a3e17c36933ddc5a5cff6ab95f9f0d71df794eec32ec4a28d109efd829 --- 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-6b4ec56 [2022-11-20 20:02:53,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:02:53,972 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:02:53,993 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:02:53,993 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:02:53,994 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:02:54,005 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:02:54,009 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:02:54,011 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:02:54,017 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:02:54,018 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:02:54,019 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:02:54,020 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:02:54,021 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:02:54,022 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:02:54,023 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:02:54,023 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:02:54,024 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:02:54,025 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:02:54,027 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:02:54,028 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:02:54,029 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:02:54,030 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:02:54,031 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:02:54,034 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:02:54,034 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:02:54,034 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:02:54,035 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:02:54,036 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:02:54,036 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:02:54,037 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:02:54,037 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:02:54,038 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:02:54,039 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:02:54,040 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:02:54,040 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:02:54,041 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:02:54,041 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:02:54,041 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:02:54,042 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:02:54,043 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:02:54,043 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:02:54,066 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:02:54,066 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:02:54,066 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:02:54,067 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:02:54,067 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:02:54,067 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:02:54,068 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:02:54,068 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:02:54,068 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:02:54,068 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:02:54,068 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:02:54,069 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:02:54,069 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:02:54,069 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:02:54,069 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:02:54,070 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:02:54,070 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:02:54,070 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:02:54,071 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:02:54,071 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:02:54,071 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:02:54,071 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:02:54,071 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:02:54,072 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:02:54,072 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:02:54,072 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:02:54,072 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:02:54,072 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:02:54,073 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:02:54,073 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:02:54,073 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:02:54,073 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:02:54,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:02:54,074 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:02:54,074 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:02:54,074 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:02:54,074 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:02:54,074 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:02:54,075 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:02:54,075 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:02:54,075 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:02:54,075 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_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b1b107a3e17c36933ddc5a5cff6ab95f9f0d71df794eec32ec4a28d109efd829 [2022-11-20 20:02:54,359 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:02:54,381 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:02:54,384 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:02:54,385 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:02:54,386 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:02:54,387 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/array-fpi/modn.c [2022-11-20 20:02:57,377 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:02:57,628 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:02:57,629 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/sv-benchmarks/c/array-fpi/modn.c [2022-11-20 20:02:57,634 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/data/27be5a0ff/f65d2ab8c5484cea8e8adb29b7e0037d/FLAGe7a8497cc [2022-11-20 20:02:57,648 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/data/27be5a0ff/f65d2ab8c5484cea8e8adb29b7e0037d [2022-11-20 20:02:57,650 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:02:57,652 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:02:57,653 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:02:57,653 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:02:57,657 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:02:57,658 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,659 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5760240e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57, skipping insertion in model container [2022-11-20 20:02:57,659 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,667 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:02:57,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:02:57,813 WARN L237 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_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/sv-benchmarks/c/array-fpi/modn.c[587,600] [2022-11-20 20:02:57,831 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:02:57,838 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:02:57,849 WARN L237 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_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/sv-benchmarks/c/array-fpi/modn.c[587,600] [2022-11-20 20:02:57,855 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:02:57,868 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:02:57,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57 WrapperNode [2022-11-20 20:02:57,869 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:02:57,870 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:02:57,870 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:02:57,870 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:02:57,876 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,883 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,901 INFO L138 Inliner]: procedures = 17, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 78 [2022-11-20 20:02:57,901 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:02:57,902 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:02:57,902 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:02:57,902 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:02:57,910 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,910 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,912 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,912 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,917 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,921 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,922 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,923 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:02:57,925 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:02:57,926 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:02:57,926 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:02:57,926 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (1/1) ... [2022-11-20 20:02:57,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:02:57,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:02:57,960 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:02:57,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:02:58,009 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:02:58,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:02:58,010 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 20:02:58,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 20:02:58,010 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 20:02:58,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:02:58,011 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:02:58,011 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-20 20:02:58,011 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 20:02:58,096 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:02:58,098 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:02:58,317 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:02:58,356 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:02:58,356 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-20 20:02:58,359 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:02:58 BoogieIcfgContainer [2022-11-20 20:02:58,359 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:02:58,361 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:02:58,361 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:02:58,365 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:02:58,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:02:57" (1/3) ... [2022-11-20 20:02:58,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c60f23f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:02:58, skipping insertion in model container [2022-11-20 20:02:58,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:02:57" (2/3) ... [2022-11-20 20:02:58,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c60f23f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:02:58, skipping insertion in model container [2022-11-20 20:02:58,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:02:58" (3/3) ... [2022-11-20 20:02:58,368 INFO L112 eAbstractionObserver]: Analyzing ICFG modn.c [2022-11-20 20:02:58,388 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:02:58,388 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 20:02:58,429 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:02:58,436 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;@246d3924, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:02:58,436 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 20:02:58,441 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:58,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:02:58,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:58,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:02:58,455 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:02:58,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:58,461 INFO L85 PathProgramCache]: Analyzing trace with hash 90967917, now seen corresponding path program 1 times [2022-11-20 20:02:58,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:02:58,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789724263] [2022-11-20 20:02:58,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:58,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:02:58,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:02:58,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:58,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:02:58,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789724263] [2022-11-20 20:02:58,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789724263] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:02:58,890 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:02:58,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:02:58,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333612242] [2022-11-20 20:02:58,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:02:58,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:02:58,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:02:58,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:02:58,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:02:58,965 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:02:59,058 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2022-11-20 20:02:59,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:02:59,061 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:02:59,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:02:59,069 INFO L225 Difference]: With dead ends: 20 [2022-11-20 20:02:59,083 INFO L226 Difference]: Without dead ends: 10 [2022-11-20 20:02:59,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:02:59,090 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:02:59,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:02:59,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-20 20:02:59,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2022-11-20 20:02:59,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2022-11-20 20:02:59,127 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2022-11-20 20:02:59,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:02:59,129 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2022-11-20 20:02:59,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,130 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2022-11-20 20:02:59,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:02:59,131 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:59,131 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:02:59,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 20:02:59,134 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:02:59,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:59,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1733550639, now seen corresponding path program 1 times [2022-11-20 20:02:59,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:02:59,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185024448] [2022-11-20 20:02:59,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:59,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:02:59,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:02:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:02:59,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:02:59,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185024448] [2022-11-20 20:02:59,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185024448] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:02:59,297 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:02:59,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:02:59,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945322354] [2022-11-20 20:02:59,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:02:59,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:02:59,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:02:59,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:02:59,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:02:59,301 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:02:59,334 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-11-20 20:02:59,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:02:59,335 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 20:02:59,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:02:59,336 INFO L225 Difference]: With dead ends: 21 [2022-11-20 20:02:59,336 INFO L226 Difference]: Without dead ends: 16 [2022-11-20 20:02:59,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:02:59,338 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:02:59,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 6 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:02:59,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-20 20:02:59,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 11. [2022-11-20 20:02:59,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-20 20:02:59,343 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2022-11-20 20:02:59,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:02:59,344 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-20 20:02:59,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,344 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-20 20:02:59,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:02:59,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:59,345 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:02:59,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 20:02:59,345 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:02:59,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:59,346 INFO L85 PathProgramCache]: Analyzing trace with hash 2086190460, now seen corresponding path program 1 times [2022-11-20 20:02:59,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:02:59,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167220517] [2022-11-20 20:02:59,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:59,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:02:59,368 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:02:59,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [796585568] [2022-11-20 20:02:59,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:59,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:02:59,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:02:59,400 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:02:59,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:02:59,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:02:59,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:02:59,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:59,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:02:59,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:02:59,870 INFO L321 Elim1Store]: treesize reduction 19, result has 44.1 percent of original size [2022-11-20 20:02:59,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 28 [2022-11-20 20:03:00,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 22 [2022-11-20 20:03:00,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:00,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:02,420 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse7 (select (select |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (let ((.cse3 (< c_~N~0 0)) (.cse6 (mod .cse7 c_~N~0))) (let ((.cse0 (= .cse6 0)) (.cse1 (< .cse7 0)) (.cse5 (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse4 (not .cse3))) (and (or (and (not .cse0) .cse1) (let ((.cse2 (forall ((|ULTIMATE.start_main_~a~0#1.base| Int)) (= (select (store (select |c_#memory_int| |ULTIMATE.start_main_~a~0#1.base|) .cse5 .cse6) |c_ULTIMATE.start_main_~a~0#1.offset|) 0)))) (and (or .cse2 .cse3) (or .cse4 .cse2)))) (or .cse0 (not .cse1) (and (or (forall ((|ULTIMATE.start_main_~a~0#1.base| Int)) (= (select (store (select |c_#memory_int| |ULTIMATE.start_main_~a~0#1.base|) .cse5 (+ .cse6 (* (- 1) c_~N~0))) |c_ULTIMATE.start_main_~a~0#1.offset|) 0)) .cse3) (or (forall ((|ULTIMATE.start_main_~a~0#1.base| Int)) (= (select (store (select |c_#memory_int| |ULTIMATE.start_main_~a~0#1.base|) .cse5 (+ c_~N~0 .cse6)) |c_ULTIMATE.start_main_~a~0#1.offset|) 0)) .cse4))))))) is different from false [2022-11-20 20:03:07,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2022-11-20 20:03:07,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:07,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167220517] [2022-11-20 20:03:07,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:07,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796585568] [2022-11-20 20:03:07,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796585568] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:07,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2030186027] [2022-11-20 20:03:07,045 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:07,045 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:07,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:07,067 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:07,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:07,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,376 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:07,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:07,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:07,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:07,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:07,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:07,755 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:07,834 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:07,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:07,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:08,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:08,068 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:08,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:03:08,217 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:08,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:08,290 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:09,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '169#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:09,543 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:09,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:09,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-11-20 20:03:09,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781291591] [2022-11-20 20:03:09,544 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:09,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:03:09,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:09,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:03:09,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=251, Unknown=2, NotChecked=32, Total=342 [2022-11-20 20:03:09,546 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:09,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:09,782 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2022-11-20 20:03:09,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:03:09,782 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:03:09,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:09,783 INFO L225 Difference]: With dead ends: 21 [2022-11-20 20:03:09,783 INFO L226 Difference]: Without dead ends: 19 [2022-11-20 20:03:09,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=62, Invalid=282, Unknown=2, NotChecked=34, Total=380 [2022-11-20 20:03:09,785 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 5 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:09,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 49 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:03:09,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-20 20:03:09,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2022-11-20 20:03:09,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:09,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-20 20:03:09,790 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2022-11-20 20:03:09,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:09,791 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-20 20:03:09,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:09,791 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-20 20:03:09,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:03:09,792 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:09,792 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:09,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:09,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:09,993 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:09,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:09,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1070514912, now seen corresponding path program 2 times [2022-11-20 20:03:09,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:09,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683574405] [2022-11-20 20:03:09,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:09,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:10,009 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:10,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [78684445] [2022-11-20 20:03:10,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:03:10,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:10,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:10,012 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:10,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 20:03:10,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 20:03:10,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:10,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:03:10,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:10,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:10,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:10,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:10,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:10,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683574405] [2022-11-20 20:03:10,371 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:10,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78684445] [2022-11-20 20:03:10,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78684445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:10,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1290417380] [2022-11-20 20:03:10,374 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:10,374 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:10,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:10,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:10,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:10,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,633 INFO L321 Elim1Store]: treesize reduction 68, result has 33.3 percent of original size [2022-11-20 20:03:10,634 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 57 [2022-11-20 20:03:10,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,908 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:10,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:10,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:10,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:11,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:11,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:11,138 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:11,203 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:11,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:11,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:11,338 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:11,380 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:11,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:03:11,507 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:11,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:11,565 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:12,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:12,704 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:12,704 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:12,704 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-11-20 20:03:12,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78238712] [2022-11-20 20:03:12,704 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:12,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-20 20:03:12,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:12,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-20 20:03:12,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-20 20:03:12,706 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:13,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:13,137 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-11-20 20:03:13,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:03:13,138 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:03:13,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:13,139 INFO L225 Difference]: With dead ends: 34 [2022-11-20 20:03:13,139 INFO L226 Difference]: Without dead ends: 29 [2022-11-20 20:03:13,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-11-20 20:03:13,140 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 33 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:13,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 31 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:03:13,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-20 20:03:13,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 17. [2022-11-20 20:03:13,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:13,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-11-20 20:03:13,147 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2022-11-20 20:03:13,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:13,147 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-11-20 20:03:13,148 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:13,148 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-11-20 20:03:13,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:03:13,148 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:13,149 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:13,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:13,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:13,356 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:13,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:13,356 INFO L85 PathProgramCache]: Analyzing trace with hash 239080241, now seen corresponding path program 3 times [2022-11-20 20:03:13,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:13,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136730176] [2022-11-20 20:03:13,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:13,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:13,375 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:13,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2022869850] [2022-11-20 20:03:13,385 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:03:13,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:13,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:13,387 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:13,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 20:03:13,456 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:03:13,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:13,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:03:13,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:13,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:13,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:13,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:13,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136730176] [2022-11-20 20:03:13,625 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:13,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022869850] [2022-11-20 20:03:13,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022869850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:13,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [791729604] [2022-11-20 20:03:13,630 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:13,631 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:13,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:13,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:13,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:13,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,864 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:13,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:13,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:13,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:13,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:13,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:14,127 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:14,191 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:14,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:14,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:14,341 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:14,385 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:14,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:03:14,502 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:14,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:14,535 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:15,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '449#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:15,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:15,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:15,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-11-20 20:03:15,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377312190] [2022-11-20 20:03:15,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:15,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:03:15,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:15,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:03:15,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:03:15,386 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:15,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:15,578 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2022-11-20 20:03:15,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:03:15,579 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:03:15,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:15,580 INFO L225 Difference]: With dead ends: 35 [2022-11-20 20:03:15,580 INFO L226 Difference]: Without dead ends: 23 [2022-11-20 20:03:15,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-11-20 20:03:15,581 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:15,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 18 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:03:15,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-20 20:03:15,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 13. [2022-11-20 20:03:15,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:15,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-20 20:03:15,585 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2022-11-20 20:03:15,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:15,585 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-20 20:03:15,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:15,586 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-20 20:03:15,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:03:15,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:15,586 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:15,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:15,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:15,791 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:15,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:15,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1182090675, now seen corresponding path program 4 times [2022-11-20 20:03:15,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:15,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142068845] [2022-11-20 20:03:15,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:15,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:15,807 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:15,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [461641142] [2022-11-20 20:03:15,808 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:03:15,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:15,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:15,820 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:15,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 20:03:15,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:15,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-20 20:03:15,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:15,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:03:15,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:03:15,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:03:16,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:03:16,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2022-11-20 20:03:16,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:16,359 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 34 [2022-11-20 20:03:16,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 25 [2022-11-20 20:03:16,633 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:16,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:17,920 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:17,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:17,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142068845] [2022-11-20 20:03:17,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:17,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461641142] [2022-11-20 20:03:17,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461641142] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:17,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [367597300] [2022-11-20 20:03:17,923 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:17,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:17,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:17,924 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:17,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:17,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:17,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:17,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:18,176 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:18,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:18,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:18,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:18,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:18,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:18,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:18,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:18,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:18,417 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:18,471 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:18,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:18,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:18,609 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:18,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:03:18,730 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:18,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:18,786 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:20,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '606#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:20,024 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:20,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:20,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2022-11-20 20:03:20,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901211401] [2022-11-20 20:03:20,025 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:20,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-20 20:03:20,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:20,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-20 20:03:20,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-11-20 20:03:20,026 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:20,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:20,351 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2022-11-20 20:03:20,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:03:20,355 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:03:20,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:20,356 INFO L225 Difference]: With dead ends: 30 [2022-11-20 20:03:20,356 INFO L226 Difference]: Without dead ends: 28 [2022-11-20 20:03:20,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2022-11-20 20:03:20,357 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 4 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:20,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 20 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 32 Unchecked, 0.1s Time] [2022-11-20 20:03:20,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-20 20:03:20,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2022-11-20 20:03:20,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 22 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:20,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2022-11-20 20:03:20,365 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 11 [2022-11-20 20:03:20,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:20,365 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2022-11-20 20:03:20,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:20,365 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2022-11-20 20:03:20,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:03:20,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:20,366 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:20,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:20,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-20 20:03:20,570 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:20,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:20,571 INFO L85 PathProgramCache]: Analyzing trace with hash 2060601037, now seen corresponding path program 5 times [2022-11-20 20:03:20,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:20,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927922009] [2022-11-20 20:03:20,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:20,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:20,586 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:20,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1324685449] [2022-11-20 20:03:20,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:03:20,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:20,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:20,587 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:20,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 20:03:20,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:03:20,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:20,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 20:03:20,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:20,894 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:20,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:21,037 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:21,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:21,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927922009] [2022-11-20 20:03:21,038 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:21,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324685449] [2022-11-20 20:03:21,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324685449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:21,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173390079] [2022-11-20 20:03:21,040 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:21,040 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:21,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:21,041 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:21,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:21,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,305 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:21,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:21,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:21,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:21,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:21,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:21,552 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:21,620 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:21,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:21,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:21,771 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:21,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:03:21,892 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:21,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:21,951 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:22,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '787#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:22,988 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:22,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:22,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2022-11-20 20:03:22,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954016909] [2022-11-20 20:03:22,989 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:22,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-20 20:03:22,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:22,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-20 20:03:22,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:03:22,991 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:23,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:23,605 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2022-11-20 20:03:23,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:03:23,606 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:03:23,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:23,608 INFO L225 Difference]: With dead ends: 56 [2022-11-20 20:03:23,609 INFO L226 Difference]: Without dead ends: 49 [2022-11-20 20:03:23,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 15 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=123, Invalid=429, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:03:23,610 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 49 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:23,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 59 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:03:23,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-20 20:03:23,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 21. [2022-11-20 20:03:23,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:23,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-11-20 20:03:23,622 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 13 [2022-11-20 20:03:23,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:23,622 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-11-20 20:03:23,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:23,623 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-11-20 20:03:23,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:03:23,623 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:23,623 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:23,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:23,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:23,831 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:23,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:23,831 INFO L85 PathProgramCache]: Analyzing trace with hash 2055930012, now seen corresponding path program 6 times [2022-11-20 20:03:23,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:23,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447484741] [2022-11-20 20:03:23,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:23,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:23,869 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:23,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1053936393] [2022-11-20 20:03:23,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:03:23,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:23,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:23,873 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:23,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 20:03:24,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:03:24,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:24,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-20 20:03:24,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:24,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:03:24,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:03:24,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:03:24,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:03:24,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:03:24,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2022-11-20 20:03:24,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 40 [2022-11-20 20:03:24,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:24,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-11-20 20:03:25,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 25 [2022-11-20 20:03:25,195 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:25,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:30,218 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:30,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:30,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447484741] [2022-11-20 20:03:30,218 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:30,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053936393] [2022-11-20 20:03:30,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053936393] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:30,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [328101105] [2022-11-20 20:03:30,223 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:30,223 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:30,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:30,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:30,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:30,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,490 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:30,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:30,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:03:30,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:30,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:30,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:30,718 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:30,780 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:30,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:30,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:30,939 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:30,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:03:31,084 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:31,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:31,163 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:33,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1017#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:33,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:33,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:33,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2022-11-20 20:03:33,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654885985] [2022-11-20 20:03:33,309 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:33,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 20:03:33,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:33,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 20:03:33,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=612, Unknown=1, NotChecked=0, Total=702 [2022-11-20 20:03:33,311 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:41,642 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-11-20 20:03:43,677 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-11-20 20:03:46,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:46,030 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2022-11-20 20:03:46,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:03:46,030 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:03:46,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:46,031 INFO L225 Difference]: With dead ends: 36 [2022-11-20 20:03:46,031 INFO L226 Difference]: Without dead ends: 34 [2022-11-20 20:03:46,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 8 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=108, Invalid=760, Unknown=2, NotChecked=0, Total=870 [2022-11-20 20:03:46,032 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 5 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:46,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 55 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 2 Unknown, 91 Unchecked, 4.4s Time] [2022-11-20 20:03:46,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-20 20:03:46,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 21. [2022-11-20 20:03:46,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:46,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-11-20 20:03:46,043 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 13 [2022-11-20 20:03:46,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:46,043 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-11-20 20:03:46,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:46,044 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-11-20 20:03:46,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:03:46,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:46,045 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:46,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:46,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:46,251 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:46,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:46,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1911128237, now seen corresponding path program 7 times [2022-11-20 20:03:46,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:46,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146048423] [2022-11-20 20:03:46,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:46,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:46,263 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:46,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [730469680] [2022-11-20 20:03:46,270 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:03:46,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:46,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:46,272 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:46,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 20:03:46,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:46,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 20:03:46,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:46,514 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:46,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:46,619 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:46,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:46,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146048423] [2022-11-20 20:03:46,619 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:46,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730469680] [2022-11-20 20:03:46,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730469680] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:46,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487091827] [2022-11-20 20:03:46,622 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:46,622 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:46,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:46,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:46,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:46,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:46,702 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-20 20:03:46,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 102 [2022-11-20 20:03:46,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:46,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:46,874 INFO L321 Elim1Store]: treesize reduction 68, result has 33.3 percent of original size [2022-11-20 20:03:46,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 57 [2022-11-20 20:03:46,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:46,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:46,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:47,103 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:47,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:47,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:47,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:47,267 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:47,323 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:47,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:47,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:47,433 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:47,472 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:47,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:03:47,570 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:47,570 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:47,623 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:48,836 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1206#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:48,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:48,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:48,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2022-11-20 20:03:48,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761909432] [2022-11-20 20:03:48,837 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:48,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-20 20:03:48,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:48,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-20 20:03:48,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2022-11-20 20:03:48,838 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:49,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:49,129 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2022-11-20 20:03:49,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:03:49,130 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:03:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:49,130 INFO L225 Difference]: With dead ends: 54 [2022-11-20 20:03:49,131 INFO L226 Difference]: Without dead ends: 43 [2022-11-20 20:03:49,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 15 SyntacticMatches, 8 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-11-20 20:03:49,132 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 48 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:49,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 30 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:03:49,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-20 20:03:49,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 26. [2022-11-20 20:03:49,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:49,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-11-20 20:03:49,142 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2022-11-20 20:03:49,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:49,143 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-11-20 20:03:49,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:49,143 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-11-20 20:03:49,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:03:49,144 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:49,144 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:49,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:49,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:49,350 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:49,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:49,351 INFO L85 PathProgramCache]: Analyzing trace with hash -698993647, now seen corresponding path program 8 times [2022-11-20 20:03:49,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:49,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5768752] [2022-11-20 20:03:49,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:49,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:49,363 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:49,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2052894601] [2022-11-20 20:03:49,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:03:49,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:49,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:49,365 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:49,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 20:03:49,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:03:49,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:49,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 20:03:49,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:49,687 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:49,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:49,859 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:49,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:03:49,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5768752] [2022-11-20 20:03:49,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:03:49,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052894601] [2022-11-20 20:03:49,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052894601] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:49,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1880682429] [2022-11-20 20:03:49,862 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:03:49,862 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:03:49,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:03:49,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:03:49,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:03:49,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:49,938 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-20 20:03:49,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 102 [2022-11-20 20:03:49,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:49,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:49,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:50,216 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:03:50,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:03:50,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:50,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:50,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:03:50,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:50,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:03:50,451 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:50,509 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:03:50,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:03:50,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:03:50,625 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:03:50,673 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:03:50,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:03:50,795 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:03:50,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:03:50,851 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:03:52,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1429#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:03:52,063 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:03:52,063 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:03:52,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2022-11-20 20:03:52,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422274504] [2022-11-20 20:03:52,064 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:52,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:03:52,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:03:52,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:03:52,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2022-11-20 20:03:52,065 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:52,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:52,702 INFO L93 Difference]: Finished difference Result 71 states and 77 transitions. [2022-11-20 20:03:52,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:03:52,703 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:03:52,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:52,705 INFO L225 Difference]: With dead ends: 71 [2022-11-20 20:03:52,705 INFO L226 Difference]: Without dead ends: 63 [2022-11-20 20:03:52,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=152, Invalid=498, Unknown=0, NotChecked=0, Total=650 [2022-11-20 20:03:52,707 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 81 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:52,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 48 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:03:52,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-20 20:03:52,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 34. [2022-11-20 20:03:52,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:52,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-11-20 20:03:52,721 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 14 [2022-11-20 20:03:52,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:52,722 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-11-20 20:03:52,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:52,722 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-11-20 20:03:52,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:03:52,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:52,723 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:52,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:52,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:52,924 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:03:52,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:52,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1221265221, now seen corresponding path program 1 times [2022-11-20 20:03:52,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:03:52,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943165778] [2022-11-20 20:03:52,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:52,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:03:52,936 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:03:52,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1923319717] [2022-11-20 20:03:52,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:52,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:52,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:52,938 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:52,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 20:03:53,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:53,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-20 20:03:53,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:53,069 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:03:53,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:03:53,207 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:03:53,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:53,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 38 [2022-11-20 20:03:53,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:53,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:03:53,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 72 [2022-11-20 20:04:08,187 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 20:04:08,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 154 treesize of output 162 [2022-11-20 20:04:10,018 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:10,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:14,368 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:14,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:04:14,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943165778] [2022-11-20 20:04:14,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:04:14,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923319717] [2022-11-20 20:04:14,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923319717] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:14,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075223009] [2022-11-20 20:04:14,370 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 20:04:14,371 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:04:14,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:04:14,371 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:04:14,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:04:14,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,587 INFO L321 Elim1Store]: treesize reduction 68, result has 33.3 percent of original size [2022-11-20 20:04:14,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 57 [2022-11-20 20:04:14,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,801 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:04:14,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:04:14,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:04:14,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:14,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:04:14,995 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:04:15,049 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:04:15,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:04:15,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:04:15,217 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:04:15,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:04:15,350 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:04:15,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:04:15,434 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:04:18,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1707#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:04:18,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:04:18,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:04:18,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2022-11-20 20:04:18,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000169093] [2022-11-20 20:04:18,167 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:04:18,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:04:18,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:04:18,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:04:18,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=684, Unknown=0, NotChecked=0, Total=812 [2022-11-20 20:04:18,169 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 24 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:22,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:04:22,499 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2022-11-20 20:04:22,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:04:22,499 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:04:22,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:04:22,500 INFO L225 Difference]: With dead ends: 45 [2022-11-20 20:04:22,500 INFO L226 Difference]: Without dead ends: 35 [2022-11-20 20:04:22,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=156, Invalid=836, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:04:22,502 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 5 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:04:22,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 14 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 67 Invalid, 0 Unknown, 30 Unchecked, 0.3s Time] [2022-11-20 20:04:22,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-20 20:04:22,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-20 20:04:22,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:22,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2022-11-20 20:04:22,519 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 14 [2022-11-20 20:04:22,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:04:22,519 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2022-11-20 20:04:22,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:22,519 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2022-11-20 20:04:22,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:04:22,520 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:04:22,520 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:04:22,527 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-20 20:04:22,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:22,723 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:04:22,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:04:22,723 INFO L85 PathProgramCache]: Analyzing trace with hash -8393427, now seen corresponding path program 9 times [2022-11-20 20:04:22,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:04:22,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249004646] [2022-11-20 20:04:22,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:04:22,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:04:22,737 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:04:22,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [809600368] [2022-11-20 20:04:22,738 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:04:22,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:22,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:04:22,739 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:04:22,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 20:04:22,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:04:22,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:22,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-20 20:04:22,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:22,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:04:22,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:04:22,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:04:23,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:04:23,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:04:23,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:04:23,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2022-11-20 20:04:23,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:23,563 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:04:23,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 36 [2022-11-20 20:04:23,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:23,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:23,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:23,790 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:04:23,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 50 [2022-11-20 20:04:24,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:24,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:24,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:24,073 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:04:24,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 50 [2022-11-20 20:04:24,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:04:24,566 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 20:04:24,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 34 [2022-11-20 20:04:24,648 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:24,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:59,224 WARN L233 SmtUtils]: Spent 27.88s on a formula simplification. DAG size of input: 94 DAG size of output: 91 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:05:07,665 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:07,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:07,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249004646] [2022-11-20 20:05:07,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:07,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809600368] [2022-11-20 20:05:07,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809600368] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:05:07,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051278786] [2022-11-20 20:05:07,667 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:05:07,668 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:05:07,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:05:07,668 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:05:07,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:05:07,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,862 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:05:07,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:05:07,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:05:07,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:05:07,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:07,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:05:08,054 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:05:08,100 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:05:08,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:05:08,183 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:05:08,222 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:05:08,267 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:05:08,267 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:05:08,385 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:05:08,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:05:08,425 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:05:10,194 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1955#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:05:10,194 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:05:10,194 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:05:10,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2022-11-20 20:05:10,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341453070] [2022-11-20 20:05:10,195 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:05:10,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 20:05:10,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:10,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 20:05:10,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=787, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:05:10,196 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:21,607 WARN L233 SmtUtils]: Spent 6.38s on a formula simplification that was a NOOP. DAG size: 93 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:05:23,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:23,900 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-11-20 20:05:23,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 20:05:23,901 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:05:23,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:23,902 INFO L225 Difference]: With dead ends: 68 [2022-11-20 20:05:23,902 INFO L226 Difference]: Without dead ends: 66 [2022-11-20 20:05:23,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 55.7s TimeCoverageRelationStatistics Valid=221, Invalid=1185, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 20:05:23,903 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:23,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 50 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 105 Invalid, 0 Unknown, 84 Unchecked, 0.2s Time] [2022-11-20 20:05:23,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-20 20:05:23,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 47. [2022-11-20 20:05:23,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 46 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:23,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 60 transitions. [2022-11-20 20:05:23,933 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 60 transitions. Word has length 15 [2022-11-20 20:05:23,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:23,933 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 60 transitions. [2022-11-20 20:05:23,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:23,933 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 60 transitions. [2022-11-20 20:05:23,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 20:05:23,934 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:23,934 INFO L195 NwaCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:23,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:24,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-20 20:05:24,140 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:24,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:24,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1287218733, now seen corresponding path program 10 times [2022-11-20 20:05:24,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:24,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281719362] [2022-11-20 20:05:24,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:24,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:24,156 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:24,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [681914212] [2022-11-20 20:05:24,157 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:05:24,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:24,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:24,158 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:24,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 20:05:24,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:24,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:05:24,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:24,601 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 28 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:24,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:05:24,911 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 28 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:24,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:24,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281719362] [2022-11-20 20:05:24,912 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:24,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681914212] [2022-11-20 20:05:24,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681914212] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:05:24,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1123241841] [2022-11-20 20:05:24,914 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:05:24,914 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:05:24,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:05:24,915 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:05:24,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:05:24,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:24,978 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-20 20:05:24,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 102 [2022-11-20 20:05:24,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,196 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:05:25,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:05:25,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:05:25,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:25,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:05:25,337 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:05:25,387 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:05:25,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:05:25,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:05:25,485 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:05:25,525 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:05:25,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:05:25,619 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:05:25,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:05:25,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:05:26,691 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2300#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:05:26,691 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:05:26,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:05:26,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2022-11-20 20:05:26,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512518088] [2022-11-20 20:05:26,692 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:05:26,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-20 20:05:26,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:26,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-20 20:05:26,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=679, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:05:26,693 INFO L87 Difference]: Start difference. First operand 47 states and 60 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:28,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:28,497 INFO L93 Difference]: Finished difference Result 160 states and 181 transitions. [2022-11-20 20:05:28,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-20 20:05:28,497 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-20 20:05:28,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:28,498 INFO L225 Difference]: With dead ends: 160 [2022-11-20 20:05:28,498 INFO L226 Difference]: Without dead ends: 140 [2022-11-20 20:05:28,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 17 SyntacticMatches, 10 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 998 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=603, Invalid=2153, Unknown=0, NotChecked=0, Total=2756 [2022-11-20 20:05:28,500 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 185 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:28,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 243 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-20 20:05:28,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-11-20 20:05:28,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 53. [2022-11-20 20:05:28,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:28,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-11-20 20:05:28,534 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 19 [2022-11-20 20:05:28,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:28,534 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-11-20 20:05:28,534 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:28,535 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-11-20 20:05:28,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 20:05:28,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:28,535 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:28,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:28,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:28,736 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:28,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:28,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1971440504, now seen corresponding path program 2 times [2022-11-20 20:05:28,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:28,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359889066] [2022-11-20 20:05:28,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:28,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:28,750 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:28,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [734506783] [2022-11-20 20:05:28,754 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:05:28,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:28,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:28,755 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:28,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 20:05:28,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:05:28,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:05:28,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:05:28,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:29,119 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:05:29,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:05:29,311 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:05:29,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:29,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359889066] [2022-11-20 20:05:29,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:29,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734506783] [2022-11-20 20:05:29,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734506783] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:05:29,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516730924] [2022-11-20 20:05:29,313 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 20:05:29,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:05:29,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:05:29,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:05:29,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:05:29,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,539 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:05:29,540 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:05:29,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:05:29,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:05:29,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:05:29,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:05:29,710 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:05:29,755 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:05:29,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:05:29,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:05:29,871 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:05:29,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:05:30,075 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:05:30,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:05:30,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:05:31,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2797#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:05:31,239 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:05:31,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:05:31,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2022-11-20 20:05:31,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605398063] [2022-11-20 20:05:31,239 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:05:31,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 20:05:31,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:31,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 20:05:31,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-11-20 20:05:31,240 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:31,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:31,902 INFO L93 Difference]: Finished difference Result 102 states and 112 transitions. [2022-11-20 20:05:31,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:05:31,903 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-20 20:05:31,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:31,904 INFO L225 Difference]: With dead ends: 102 [2022-11-20 20:05:31,904 INFO L226 Difference]: Without dead ends: 92 [2022-11-20 20:05:31,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 24 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=196, Invalid=734, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:05:31,905 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 88 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:31,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 78 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:05:31,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-20 20:05:31,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 58. [2022-11-20 20:05:31,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:31,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2022-11-20 20:05:31,953 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 19 [2022-11-20 20:05:31,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:31,954 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2022-11-20 20:05:31,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:31,954 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2022-11-20 20:05:31,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 20:05:31,956 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:31,957 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:31,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:32,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-20 20:05:32,163 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:32,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:32,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1173097116, now seen corresponding path program 3 times [2022-11-20 20:05:32,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:32,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549244837] [2022-11-20 20:05:32,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:32,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:32,178 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:32,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [640155904] [2022-11-20 20:05:32,179 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:05:32,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:32,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:32,186 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:32,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 20:05:32,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:05:32,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:05:32,272 WARN L261 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-20 20:05:32,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:32,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:05:32,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:05:32,421 INFO L321 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2022-11-20 20:05:32,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 163 treesize of output 132 [2022-11-20 20:05:35,128 INFO L321 Elim1Store]: treesize reduction 33, result has 34.0 percent of original size [2022-11-20 20:05:35,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 208 treesize of output 152 [2022-11-20 20:05:37,909 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 20:05:37,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 30 [2022-11-20 20:05:38,002 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:05:38,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:20,238 WARN L233 SmtUtils]: Spent 30.15s on a formula simplification. DAG size of input: 82 DAG size of output: 53 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:06:32,154 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:06:32,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:06:32,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549244837] [2022-11-20 20:06:32,154 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:06:32,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640155904] [2022-11-20 20:06:32,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640155904] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:06:32,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2068910354] [2022-11-20 20:06:32,156 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 20:06:32,156 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:06:32,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:06:32,157 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:06:32,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:06:32,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,328 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:06:32,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:06:32,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:06:32,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,372 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:06:32,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:32,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:06:32,487 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:06:32,534 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:06:32,534 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:06:32,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:06:32,663 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:06:32,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:06:32,755 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:06:32,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:06:32,827 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:06:36,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3202#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:06:36,402 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:06:36,402 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:06:36,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2022-11-20 20:06:36,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815320169] [2022-11-20 20:06:36,402 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:06:36,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 20:06:36,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:06:36,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 20:06:36,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=597, Unknown=6, NotChecked=0, Total=702 [2022-11-20 20:06:36,404 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:36,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:36,561 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2022-11-20 20:06:36,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:06:36,561 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-20 20:06:36,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:36,562 INFO L225 Difference]: With dead ends: 63 [2022-11-20 20:06:36,562 INFO L226 Difference]: Without dead ends: 49 [2022-11-20 20:06:36,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 59.9s TimeCoverageRelationStatistics Valid=99, Invalid=597, Unknown=6, NotChecked=0, Total=702 [2022-11-20 20:06:36,563 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:36,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 35 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 34 Unchecked, 0.1s Time] [2022-11-20 20:06:36,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-20 20:06:36,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-20 20:06:36,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:36,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2022-11-20 20:06:36,594 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 19 [2022-11-20 20:06:36,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:36,595 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2022-11-20 20:06:36,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:36,595 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2022-11-20 20:06:36,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 20:06:36,596 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:36,596 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:06:36,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:36,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-20 20:06:36,802 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:06:36,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:36,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1824011028, now seen corresponding path program 4 times [2022-11-20 20:06:36,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:06:36,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762703772] [2022-11-20 20:06:36,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:36,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:06:36,817 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:06:36,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1233022527] [2022-11-20 20:06:36,817 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:06:36,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:36,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:36,819 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:36,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 20:06:36,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:06:36,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-20 20:06:36,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:36,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:06:36,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:06:37,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:06:37,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:06:37,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:06:37,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:06:37,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:06:37,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2022-11-20 20:06:37,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:37,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 42 [2022-11-20 20:06:37,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:37,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:37,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:37,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 56 [2022-11-20 20:06:38,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 56 [2022-11-20 20:06:38,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:06:38,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 56 [2022-11-20 20:06:39,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 41 [2022-11-20 20:06:39,637 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:06:39,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:04,908 WARN L233 SmtUtils]: Spent 16.73s on a formula simplification that was a NOOP. DAG size: 91 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:09:29,544 WARN L233 SmtUtils]: Spent 2.29m on a formula simplification. DAG size of input: 149 DAG size of output: 145 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:09:50,018 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 19 refuted. 7 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:09:50,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:50,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762703772] [2022-11-20 20:09:50,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:09:50,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233022527] [2022-11-20 20:09:50,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233022527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:09:50,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862780867] [2022-11-20 20:09:50,024 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 20:09:50,024 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:09:50,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:09:50,024 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:09:50,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:09:50,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,226 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:09:50,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:09:50,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:09:50,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:09:50,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:09:50,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:09:50,403 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:09:50,453 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:09:50,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:09:50,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:09:50,575 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:09:50,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-20 20:09:50,671 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:09:50,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:09:50,769 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:09:54,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3546#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:09:54,126 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:09:54,126 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:09:54,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2022-11-20 20:09:54,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722010243] [2022-11-20 20:09:54,127 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:09:54,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 20:09:54,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:54,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 20:09:54,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=1384, Unknown=12, NotChecked=0, Total=1640 [2022-11-20 20:09:54,128 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:06,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:10:06,387 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2022-11-20 20:10:06,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-20 20:10:06,387 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-20 20:10:06,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:10:06,387 INFO L225 Difference]: With dead ends: 62 [2022-11-20 20:10:06,388 INFO L226 Difference]: Without dead ends: 60 [2022-11-20 20:10:06,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 12 SyntacticMatches, 8 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1239 ImplicationChecksByTransitivity, 204.7s TimeCoverageRelationStatistics Valid=374, Invalid=2474, Unknown=14, NotChecked=0, Total=2862 [2022-11-20 20:10:06,389 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 45 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 219 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:10:06,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 92 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 127 Invalid, 0 Unknown, 219 Unchecked, 0.2s Time] [2022-11-20 20:10:06,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-20 20:10:06,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2022-11-20 20:10:06,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:06,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2022-11-20 20:10:06,416 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 20 [2022-11-20 20:10:06,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:10:06,416 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2022-11-20 20:10:06,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:06,416 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2022-11-20 20:10:06,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 20:10:06,417 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:10:06,417 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 20:10:06,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 20:10:06,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-20 20:10:06,617 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:10:06,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:10:06,618 INFO L85 PathProgramCache]: Analyzing trace with hash 2028439149, now seen corresponding path program 5 times [2022-11-20 20:10:06,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:10:06,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502791452] [2022-11-20 20:10:06,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:10:06,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:10:06,630 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:10:06,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [341559894] [2022-11-20 20:10:06,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:10:06,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:10:06,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:10:06,632 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:10:06,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-20 20:10:06,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:10:06,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:10:06,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-20 20:10:06,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:10:06,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:10:06,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:10:06,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:10:06,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:10:06,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:10:06,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2022-11-20 20:10:07,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:10:07,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 22 [2022-11-20 20:10:07,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 36 [2022-11-20 20:10:07,770 INFO L321 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2022-11-20 20:10:07,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 62 [2022-11-20 20:10:10,487 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 33 [2022-11-20 20:10:10,588 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:10:10,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:18,205 WARN L837 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_367| Int) (v_ArrVal_709 (Array Int Int)) (v_ArrVal_714 Int)) (let ((.cse0 (store (let ((.cse2 (* |c_ULTIMATE.start_main_~i~0#1| 4))) (let ((.cse1 (store v_ArrVal_709 (+ .cse2 |c_ULTIMATE.start_main_~a~0#1.offset| 4) (mod (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_709) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) c_~N~0)))) (store .cse1 (+ .cse2 8 |c_ULTIMATE.start_main_~a~0#1.offset|) (mod (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse1) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) c_~N~0)))) (+ (* |v_ULTIMATE.start_main_~i~0#1_367| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_714))) (or (= (select .cse0 (+ 8 |c_ULTIMATE.start_main_~a~0#1.offset|)) 0) (< (+ |v_ULTIMATE.start_main_~i~0#1_367| 1) c_~N~0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4)) 0))))) is different from false [2022-11-20 20:10:22,874 WARN L837 $PredicateComparison]: unable to prove that (forall ((~N~0 Int)) (or (forall ((|v_ULTIMATE.start_main_~i~0#1_367| Int) (v_ArrVal_707 Int) (v_ArrVal_709 (Array Int Int)) (v_ArrVal_714 Int)) (let ((.cse1 (+ 8 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse3 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4)) (.cse2 (select |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse0 (store (let ((.cse5 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse2 |c_ULTIMATE.start_main_~#sum~0#1.offset| v_ArrVal_707)))) (let ((.cse4 (store v_ArrVal_709 .cse3 (mod (select (select (store .cse5 |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_709) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) ~N~0)))) (store .cse4 .cse1 (mod (select (select (store .cse5 |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) ~N~0)))) (+ (* |v_ULTIMATE.start_main_~i~0#1_367| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_714))) (or (= (select .cse0 .cse1) 0) (not (<= (+ (select .cse2 |c_ULTIMATE.start_main_~#sum~0#1.offset|) 1) v_ArrVal_707)) (< (+ |v_ULTIMATE.start_main_~i~0#1_367| 1) ~N~0) (not (= (select .cse0 .cse3) 0)))))) (not (< |c_ULTIMATE.start_main_~i~0#1| ~N~0)))) is different from false [2022-11-20 20:10:22,958 WARN L837 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_367| Int) (~N~0 Int) (v_ArrVal_707 Int) (v_ArrVal_709 (Array Int Int)) (v_ArrVal_714 Int)) (let ((.cse1 (+ 8 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse3 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4)) (.cse2 (select |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse0 (store (let ((.cse5 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse2 |c_ULTIMATE.start_main_~#sum~0#1.offset| v_ArrVal_707)))) (let ((.cse4 (store v_ArrVal_709 .cse3 (mod (select (select (store .cse5 |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_709) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) ~N~0)))) (store .cse4 .cse1 (mod (select (select (store .cse5 |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) ~N~0)))) (+ (* |v_ULTIMATE.start_main_~i~0#1_367| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_714))) (or (= (select .cse0 .cse1) 0) (< ~N~0 (+ 2 |c_ULTIMATE.start_main_~i~0#1|)) (< (+ |v_ULTIMATE.start_main_~i~0#1_367| 1) ~N~0) (< v_ArrVal_707 (+ (select .cse2 |c_ULTIMATE.start_main_~#sum~0#1.offset|) 2)) (not (= (select .cse0 .cse3) 0)))))) is different from false [2022-11-20 20:10:25,123 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 14 refuted. 1 times theorem prover too weak. 0 trivial. 11 not checked. [2022-11-20 20:10:25,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:10:25,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502791452] [2022-11-20 20:10:25,123 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:10:25,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341559894] [2022-11-20 20:10:25,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341559894] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:10:25,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [832268205] [2022-11-20 20:10:25,125 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 20:10:25,126 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:10:25,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:10:25,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:10:25,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:10:25,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,323 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:10:25,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:10:25,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 25 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2022-11-20 20:10:25,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:10:25,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:25,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:10:25,483 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:10:25,529 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:10:25,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:10:25,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:10:25,635 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:10:25,673 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:10:25,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:10:25,777 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:10:25,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:10:25,886 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:10:27,573 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3923#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:10:27,573 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:10:27,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:10:27,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2022-11-20 20:10:27,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770045756] [2022-11-20 20:10:27,573 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:10:27,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-20 20:10:27,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:10:27,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-20 20:10:27,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1092, Unknown=13, NotChecked=210, Total=1482 [2022-11-20 20:10:27,575 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:10:39,429 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2022-11-20 20:10:39,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 20:10:39,429 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-20 20:10:39,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:10:39,430 INFO L225 Difference]: With dead ends: 68 [2022-11-20 20:10:39,430 INFO L226 Difference]: Without dead ends: 66 [2022-11-20 20:10:39,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=219, Invalid=1501, Unknown=14, NotChecked=246, Total=1980 [2022-11-20 20:10:39,431 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:10:39,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 42 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 136 Invalid, 0 Unknown, 102 Unchecked, 0.4s Time] [2022-11-20 20:10:39,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-20 20:10:39,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 59. [2022-11-20 20:10:39,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 58 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:39,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2022-11-20 20:10:39,461 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 21 [2022-11-20 20:10:39,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:10:39,461 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2022-11-20 20:10:39,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:39,461 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2022-11-20 20:10:39,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-20 20:10:39,462 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:10:39,462 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:10:39,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-20 20:10:39,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-20 20:10:39,668 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:10:39,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:10:39,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1340467949, now seen corresponding path program 11 times [2022-11-20 20:10:39,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:10:39,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867500107] [2022-11-20 20:10:39,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:10:39,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:10:39,683 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:10:39,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1428462507] [2022-11-20 20:10:39,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:10:39,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:10:39,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:10:39,687 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:10:39,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_abfc760b-7e1c-4c1f-a6ee-25b224a10b48/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-20 20:10:40,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-20 20:10:40,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:10:40,021 WARN L261 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-20 20:10:40,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:10:40,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 20:10:40,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-20 20:10:40,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-20 20:10:40,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2022-11-20 20:10:40,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:40,961 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:10:40,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-11-20 20:10:41,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:41,128 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:10:41,128 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-11-20 20:10:41,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:41,288 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:10:41,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-11-20 20:10:41,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:10:41,453 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-20 20:10:41,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-11-20 20:10:41,693 INFO L321 Elim1Store]: treesize reduction 50, result has 33.3 percent of original size [2022-11-20 20:10:41,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 44 [2022-11-20 20:10:41,940 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-20 20:10:41,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 44 [2022-11-20 20:10:42,173 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-20 20:10:42,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 44 [2022-11-20 20:10:42,554 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 25 [2022-11-20 20:10:42,640 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 6 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:10:42,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:45,242 WARN L837 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~i~0#1| Int) (v_ArrVal_828 Int) (v_ArrVal_826 Int) (v_ArrVal_825 Int) (|v_ULTIMATE.start_main_~i~0#1_406| Int) (|v_ULTIMATE.start_main_~i~0#1_405| Int)) (or (< (+ |v_ULTIMATE.start_main_~i~0#1_405| 1) c_~N~0) (not (<= |v_ULTIMATE.start_main_~i~0#1_405| (+ |v_ULTIMATE.start_main_~i~0#1_406| 1))) (not (<= |v_ULTIMATE.start_main_~i~0#1_406| (+ |ULTIMATE.start_main_~i~0#1| 1))) (= (select (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_825) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_406| 4)) v_ArrVal_826) (+ (* |v_ULTIMATE.start_main_~i~0#1_405| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_828) |c_ULTIMATE.start_main_~a~0#1.offset|) 0))) is different from false [2022-11-20 20:10:47,276 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_828 Int) (|v_ULTIMATE.start_main_~i~0#1_407| Int) (v_ArrVal_826 Int) (v_ArrVal_825 Int) (v_ArrVal_822 Int) (|v_ULTIMATE.start_main_~i~0#1_406| Int) (|v_ULTIMATE.start_main_~i~0#1_405| Int)) (or (not (<= |v_ULTIMATE.start_main_~i~0#1_406| (+ |v_ULTIMATE.start_main_~i~0#1_407| 1))) (< (+ |v_ULTIMATE.start_main_~i~0#1_405| 1) c_~N~0) (not (<= |v_ULTIMATE.start_main_~i~0#1_405| (+ |v_ULTIMATE.start_main_~i~0#1_406| 1))) (= (select (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_822) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_407| 4)) v_ArrVal_825) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_406| 4)) v_ArrVal_826) (+ (* |v_ULTIMATE.start_main_~i~0#1_405| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_828) |c_ULTIMATE.start_main_~a~0#1.offset|) 0))) is different from false [2022-11-20 20:10:49,326 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_828 Int) (|v_ULTIMATE.start_main_~i~0#1_408| Int) (|v_ULTIMATE.start_main_~i~0#1_407| Int) (v_ArrVal_826 Int) (v_ArrVal_825 Int) (v_ArrVal_822 Int) (|v_ULTIMATE.start_main_~i~0#1_406| Int) (v_ArrVal_820 Int) (|v_ULTIMATE.start_main_~i~0#1_405| Int)) (or (not (<= |v_ULTIMATE.start_main_~i~0#1_406| (+ |v_ULTIMATE.start_main_~i~0#1_407| 1))) (< (+ |v_ULTIMATE.start_main_~i~0#1_405| 1) c_~N~0) (not (<= |v_ULTIMATE.start_main_~i~0#1_405| (+ |v_ULTIMATE.start_main_~i~0#1_406| 1))) (= (select (store (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_820) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_408| 4)) v_ArrVal_822) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_407| 4)) v_ArrVal_825) (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_406| 4)) v_ArrVal_826) (+ (* |v_ULTIMATE.start_main_~i~0#1_405| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) v_ArrVal_828) |c_ULTIMATE.start_main_~a~0#1.offset|) 0) (not (<= (+ |c_ULTIMATE.start_main_~i~0#1| 1) |v_ULTIMATE.start_main_~i~0#1_408|)))) is different from false [2022-11-20 20:11:27,040 WARN L233 SmtUtils]: Spent 18.42s on a formula simplification that was a NOOP. DAG size: 122 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:11:46,858 WARN L233 SmtUtils]: Spent 18.93s on a formula simplification. DAG size of input: 101 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:11:58,090 WARN L233 SmtUtils]: Spent 10.23s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:12:09,277 WARN L233 SmtUtils]: Spent 10.32s on a formula simplification that was a NOOP. DAG size: 108 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:12:36,812 WARN L233 SmtUtils]: Spent 24.79s on a formula simplification. DAG size of input: 109 DAG size of output: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:12:50,050 WARN L233 SmtUtils]: Spent 12.19s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:13:05,895 WARN L233 SmtUtils]: Spent 14.31s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:13:21,176 WARN L233 SmtUtils]: Spent 12.23s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:13:36,302 WARN L233 SmtUtils]: Spent 12.13s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:13:54,866 WARN L233 SmtUtils]: Spent 14.15s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:13:54,929 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 48 refuted. 3 times theorem prover too weak. 0 trivial. 21 not checked. [2022-11-20 20:13:54,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:13:54,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867500107] [2022-11-20 20:13:54,930 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:13:54,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428462507] [2022-11-20 20:13:54,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428462507] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:13:54,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [320091776] [2022-11-20 20:13:54,932 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:13:54,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:13:54,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:13:54,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:13:54,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:13:54,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,000 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-20 20:13:55,001 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 102 [2022-11-20 20:13:55,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,193 INFO L321 Elim1Store]: treesize reduction 94, result has 27.7 percent of original size [2022-11-20 20:13:55,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 8 case distinctions, treesize of input 40 treesize of output 69 [2022-11-20 20:13:55,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-11-20 20:13:55,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:13:55,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 25 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 103 [2022-11-20 20:13:55,375 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:13:55,434 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-20 20:13:55,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 21 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 11 case distinctions, treesize of input 423 treesize of output 398 [2022-11-20 20:13:55,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-20 20:13:55,532 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 20:13:55,608 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-20 20:13:55,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 53 [2022-11-20 20:13:55,713 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-20 20:13:55,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 63 [2022-11-20 20:13:55,764 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:14:01,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4327#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= ~N~0 2147483647) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= (ite (= |ULTIMATE.start_main_#t~mem11#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem11#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#sum~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-20 20:14:01,335 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:14:01,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:14:01,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 42 [2022-11-20 20:14:01,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158829756] [2022-11-20 20:14:01,336 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:14:01,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-20 20:14:01,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:01,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-20 20:14:01,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=1618, Unknown=12, NotChecked=258, Total=2162 [2022-11-20 20:14:01,339 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand has 42 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:11,813 WARN L233 SmtUtils]: Spent 6.18s on a formula simplification. DAG size of input: 110 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:15:00,983 WARN L233 SmtUtils]: Spent 43.79s on a formula simplification. DAG size of input: 357 DAG size of output: 223 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)