./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur --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 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 --- 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-38b53e6 [2022-11-25 23:57:35,867 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:57:35,870 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:57:35,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:57:35,905 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:57:35,906 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:57:35,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:57:35,909 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:57:35,911 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:57:35,912 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:57:35,913 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:57:35,914 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:57:35,914 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:57:35,915 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:57:35,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:57:35,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:57:35,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:57:35,919 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:57:35,921 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:57:35,923 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:57:35,925 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:57:35,929 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:57:35,930 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:57:35,931 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:57:35,935 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:57:35,935 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:57:35,935 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:57:35,936 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:57:35,937 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:57:35,938 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:57:35,938 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:57:35,939 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:57:35,940 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:57:35,941 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:57:35,942 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:57:35,951 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:57:35,952 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:57:35,952 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:57:35,952 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:57:35,953 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:57:35,954 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:57:35,956 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:57:36,001 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:57:36,002 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:57:36,002 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:57:36,003 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:57:36,003 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:57:36,004 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:57:36,004 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:57:36,004 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:57:36,004 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:57:36,005 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:57:36,015 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:57:36,015 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:57:36,016 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:57:36,016 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:57:36,016 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:57:36,016 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:57:36,016 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:57:36,017 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:57:36,018 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:57:36,018 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:57:36,018 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:57:36,018 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:57:36,018 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:57:36,019 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:57:36,019 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:57:36,019 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:57:36,020 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:57:36,020 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:57:36,020 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:57:36,020 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:57:36,021 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:57:36,021 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:57:36,021 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:57:36,021 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:57:36,022 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:57:36,022 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:57:36,022 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:57:36,022 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:57:36,022 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:57:36,023 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:57:36,023 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:57:36,023 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_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 [2022-11-25 23:57:36,294 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:57:36,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:57:36,333 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:57:36,334 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:57:36,334 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:57:36,336 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-11-25 23:57:39,573 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:57:39,781 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:57:39,787 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-11-25 23:57:39,793 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/data/51afc136b/8aa8591345c74a678a8ded3a0ceb1e94/FLAGfaf33102e [2022-11-25 23:57:39,809 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/data/51afc136b/8aa8591345c74a678a8ded3a0ceb1e94 [2022-11-25 23:57:39,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:57:39,813 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:57:39,815 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:57:39,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:57:39,823 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:57:39,824 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:57:39" (1/1) ... [2022-11-25 23:57:39,826 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14210323 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:39, skipping insertion in model container [2022-11-25 23:57:39,826 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:57:39" (1/1) ... [2022-11-25 23:57:39,834 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:57:39,853 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:57:39,998 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_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-11-25 23:57:40,021 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:57:40,031 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:57:40,043 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_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-11-25 23:57:40,048 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:57:40,062 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:57:40,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40 WrapperNode [2022-11-25 23:57:40,063 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:57:40,064 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:57:40,064 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:57:40,064 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:57:40,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,079 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,101 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2022-11-25 23:57:40,103 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:57:40,103 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:57:40,104 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:57:40,104 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:57:40,113 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,113 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,114 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,127 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,131 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,132 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,133 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:57:40,136 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:57:40,136 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:57:40,136 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:57:40,137 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (1/1) ... [2022-11-25 23:57:40,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:57:40,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:40,187 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:57:40,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:57:40,240 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:57:40,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:57:40,241 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 23:57:40,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:57:40,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:57:40,241 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:57:40,241 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 23:57:40,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 23:57:40,310 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:57:40,313 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:57:40,496 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:57:40,520 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:57:40,520 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-25 23:57:40,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:57:40 BoogieIcfgContainer [2022-11-25 23:57:40,523 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:57:40,526 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:57:40,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:57:40,530 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:57:40,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:57:39" (1/3) ... [2022-11-25 23:57:40,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@375263b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:57:40, skipping insertion in model container [2022-11-25 23:57:40,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:57:40" (2/3) ... [2022-11-25 23:57:40,532 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@375263b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:57:40, skipping insertion in model container [2022-11-25 23:57:40,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:57:40" (3/3) ... [2022-11-25 23:57:40,533 INFO L112 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2022-11-25 23:57:40,555 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:57:40,555 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:57:40,625 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:57:40,634 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;@513dba64, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:57:40,635 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:57:40,640 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) 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) [2022-11-25 23:57:40,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-25 23:57:40,647 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:40,648 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-25 23:57:40,649 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:40,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:40,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1969782628, now seen corresponding path program 1 times [2022-11-25 23:57:40,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:40,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347459335] [2022-11-25 23:57:40,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:40,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:40,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:41,015 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:41,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:41,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347459335] [2022-11-25 23:57:41,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347459335] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:57:41,018 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:57:41,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:57:41,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505461465] [2022-11-25 23:57:41,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:57:41,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:57:41,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:41,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:57:41,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:57:41,108 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) 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) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:57:41,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:41,160 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-11-25 23:57:41,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:57:41,169 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-25 23:57:41,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:41,177 INFO L225 Difference]: With dead ends: 18 [2022-11-25 23:57:41,178 INFO L226 Difference]: Without dead ends: 9 [2022-11-25 23:57:41,180 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 [2022-11-25 23:57:41,186 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:41,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:57:41,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-25 23:57:41,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-25 23:57:41,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:57:41,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-25 23:57:41,223 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2022-11-25 23:57:41,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:41,224 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-25 23:57:41,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:57:41,225 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-25 23:57:41,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-25 23:57:41,226 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:41,226 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:57:41,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:57:41,228 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:41,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:41,229 INFO L85 PathProgramCache]: Analyzing trace with hash -968964990, now seen corresponding path program 1 times [2022-11-25 23:57:41,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:41,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891331749] [2022-11-25 23:57:41,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:41,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:41,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:41,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:41,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:41,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891331749] [2022-11-25 23:57:41,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891331749] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:41,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671790511] [2022-11-25 23:57:41,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:41,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:41,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:41,722 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:41,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:57:41,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:41,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:57:41,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:41,910 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 [2022-11-25 23:57:42,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:42,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:42,092 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 14 treesize of output 12 [2022-11-25 23:57:42,097 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 22 treesize of output 20 [2022-11-25 23:57:42,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:42,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671790511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:42,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382873231] [2022-11-25 23:57:42,165 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:57:42,166 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:42,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:42,178 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:42,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:42,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:42,290 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:57:42,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:57:42,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:42,330 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:42,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:42,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:42,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:42,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:42,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:42,604 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:42,604 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:42,705 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 18 treesize of output 14 [2022-11-25 23:57:42,736 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:43,031 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:43,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:43,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:43,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-11-25 23:57:43,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123851726] [2022-11-25 23:57:43,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:43,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:57:43,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:43,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:57:43,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:57:43,036 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 10 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) [2022-11-25 23:57:43,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:43,145 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-11-25 23:57:43,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:57:43,146 INFO L78 Accepts]: Start accepts. Automaton has has 10 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) Word has length 7 [2022-11-25 23:57:43,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:43,147 INFO L225 Difference]: With dead ends: 15 [2022-11-25 23:57:43,147 INFO L226 Difference]: Without dead ends: 13 [2022-11-25 23:57:43,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-11-25 23:57:43,152 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:43,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:57:43,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-25 23:57:43,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-11-25 23:57:43,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2022-11-25 23:57:43,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-25 23:57:43,164 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2022-11-25 23:57:43,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:43,164 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-25 23:57:43,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 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) [2022-11-25 23:57:43,165 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-25 23:57:43,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 23:57:43,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:43,166 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:57:43,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:43,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:43,377 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:43,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:43,378 INFO L85 PathProgramCache]: Analyzing trace with hash 43972795, now seen corresponding path program 1 times [2022-11-25 23:57:43,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:43,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744707223] [2022-11-25 23:57:43,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:43,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:43,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:43,455 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:43,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:43,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744707223] [2022-11-25 23:57:43,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744707223] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:43,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317108125] [2022-11-25 23:57:43,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:43,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:43,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:43,458 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:43,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:57:43,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:43,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 23:57:43,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:43,564 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:43,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:43,603 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:43,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317108125] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:43,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973745493] [2022-11-25 23:57:43,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:43,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:43,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:43,607 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:43,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:43,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:43,647 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:43,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:43,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:43,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:57:43,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:43,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:43,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:43,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:43,790 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:43,791 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:43,862 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 18 treesize of output 14 [2022-11-25 23:57:43,938 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:44,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:44,304 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:44,304 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:44,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-11-25 23:57:44,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636680008] [2022-11-25 23:57:44,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:44,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:57:44,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:44,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:57:44,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:57:44,306 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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) [2022-11-25 23:57:44,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:44,359 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-11-25 23:57:44,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:57:44,359 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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) Word has length 10 [2022-11-25 23:57:44,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:44,360 INFO L225 Difference]: With dead ends: 27 [2022-11-25 23:57:44,360 INFO L226 Difference]: Without dead ends: 18 [2022-11-25 23:57:44,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-11-25 23:57:44,361 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:44,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:57:44,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-25 23:57:44,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2022-11-25 23:57:44,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2022-11-25 23:57:44,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-25 23:57:44,366 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2022-11-25 23:57:44,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:44,366 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-25 23:57:44,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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) [2022-11-25 23:57:44,367 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-25 23:57:44,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-25 23:57:44,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:44,368 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:57:44,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-25 23:57:44,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:44,573 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:44,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:44,574 INFO L85 PathProgramCache]: Analyzing trace with hash -812263007, now seen corresponding path program 2 times [2022-11-25 23:57:44,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:44,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041566318] [2022-11-25 23:57:44,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:44,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:44,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:44,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:44,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041566318] [2022-11-25 23:57:44,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041566318] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:44,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277200458] [2022-11-25 23:57:44,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:57:44,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:44,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:44,951 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:44,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:57:45,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 23:57:45,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:45,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:57:45,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:45,062 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 13 treesize of output 9 [2022-11-25 23:57:45,186 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:45,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:45,254 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 16 treesize of output 14 [2022-11-25 23:57:45,257 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 24 treesize of output 20 [2022-11-25 23:57:45,263 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 16 treesize of output 14 [2022-11-25 23:57:45,266 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 24 treesize of output 20 [2022-11-25 23:57:45,278 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:45,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277200458] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:45,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214867447] [2022-11-25 23:57:45,280 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:45,280 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:45,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:45,281 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:45,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:45,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:45,321 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:45,321 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:45,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:45,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:57:45,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:45,359 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:57:45,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:45,418 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:57:45,443 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:57:45,444 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:57:45,530 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 18 treesize of output 14 [2022-11-25 23:57:45,596 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:45,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '343#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:45,913 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:45,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:45,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2022-11-25 23:57:45,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070854645] [2022-11-25 23:57:45,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:45,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 23:57:45,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:45,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 23:57:45,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2022-11-25 23:57:45,916 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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) [2022-11-25 23:57:46,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:46,110 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-25 23:57:46,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:57:46,111 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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 11 [2022-11-25 23:57:46,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:46,112 INFO L225 Difference]: With dead ends: 19 [2022-11-25 23:57:46,112 INFO L226 Difference]: Without dead ends: 17 [2022-11-25 23:57:46,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:57:46,113 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 15 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:46,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 27 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:57:46,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-25 23:57:46,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2022-11-25 23:57:46,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 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) [2022-11-25 23:57:46,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-25 23:57:46,118 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-11-25 23:57:46,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:46,118 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-25 23:57:46,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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) [2022-11-25 23:57:46,119 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-25 23:57:46,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:57:46,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:46,119 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-25 23:57:46,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:46,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:46,325 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:46,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:46,325 INFO L85 PathProgramCache]: Analyzing trace with hash -276702404, now seen corresponding path program 3 times [2022-11-25 23:57:46,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:46,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019674224] [2022-11-25 23:57:46,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:46,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:46,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:46,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:46,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019674224] [2022-11-25 23:57:46,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019674224] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:46,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435772330] [2022-11-25 23:57:46,419 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:57:46,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:46,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:46,421 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:46,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:57:46,487 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:57:46,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:46,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:57:46,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:46,564 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:46,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:46,615 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:46,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435772330] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:46,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715738646] [2022-11-25 23:57:46,619 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:46,620 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:46,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:46,620 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:46,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:46,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:46,652 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:46,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:46,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:46,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:57:46,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:46,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:46,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:46,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:46,765 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:46,765 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:46,820 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 18 treesize of output 14 [2022-11-25 23:57:46,884 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:47,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '496#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:47,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:47,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:47,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-25 23:57:47,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915250696] [2022-11-25 23:57:47,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:47,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-25 23:57:47,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:47,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-25 23:57:47,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-25 23:57:47,154 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 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) [2022-11-25 23:57:47,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:47,223 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-11-25 23:57:47,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:57:47,223 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-25 23:57:47,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:47,224 INFO L225 Difference]: With dead ends: 34 [2022-11-25 23:57:47,224 INFO L226 Difference]: Without dead ends: 22 [2022-11-25 23:57:47,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-25 23:57:47,225 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:47,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 19 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:57:47,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-25 23:57:47,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2022-11-25 23:57:47,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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) [2022-11-25 23:57:47,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-25 23:57:47,229 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2022-11-25 23:57:47,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:47,230 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-25 23:57:47,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 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) [2022-11-25 23:57:47,230 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-25 23:57:47,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 23:57:47,231 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:47,231 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-25 23:57:47,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:47,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:47,437 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:47,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:47,437 INFO L85 PathProgramCache]: Analyzing trace with hash -1296967390, now seen corresponding path program 4 times [2022-11-25 23:57:47,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:47,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941533096] [2022-11-25 23:57:47,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:47,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:47,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:47,822 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:47,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:47,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941533096] [2022-11-25 23:57:47,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941533096] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:47,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754159148] [2022-11-25 23:57:47,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:57:47,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:47,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:47,827 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:47,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:57:47,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:47,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:57:47,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:47,954 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 13 treesize of output 9 [2022-11-25 23:57:48,093 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:48,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:48,171 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 16 treesize of output 14 [2022-11-25 23:57:48,173 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 24 treesize of output 20 [2022-11-25 23:57:48,183 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 16 treesize of output 14 [2022-11-25 23:57:48,186 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 24 treesize of output 20 [2022-11-25 23:57:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:48,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754159148] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:48,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1260669637] [2022-11-25 23:57:48,207 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:48,207 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:48,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:48,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:48,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:48,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:48,241 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:57:48,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:57:48,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:48,270 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:48,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:48,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:48,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:48,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:48,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:48,361 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:48,361 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:48,408 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 18 treesize of output 14 [2022-11-25 23:57:48,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:48,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '677#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:48,976 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:48,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:48,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-25 23:57:48,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390028526] [2022-11-25 23:57:48,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:48,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 23:57:48,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:48,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 23:57:48,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:57:48,979 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 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) [2022-11-25 23:57:49,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:49,187 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-11-25 23:57:49,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:57:49,191 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 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 [2022-11-25 23:57:49,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:49,191 INFO L225 Difference]: With dead ends: 23 [2022-11-25 23:57:49,191 INFO L226 Difference]: Without dead ends: 21 [2022-11-25 23:57:49,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 25 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:57:49,193 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:49,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 36 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:57:49,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-25 23:57:49,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-11-25 23:57:49,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 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) [2022-11-25 23:57:49,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-25 23:57:49,198 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2022-11-25 23:57:49,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:49,198 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-25 23:57:49,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 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) [2022-11-25 23:57:49,201 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-25 23:57:49,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 23:57:49,202 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:49,202 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-11-25 23:57:49,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:49,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 23:57:49,408 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:49,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:49,409 INFO L85 PathProgramCache]: Analyzing trace with hash -424927205, now seen corresponding path program 5 times [2022-11-25 23:57:49,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:49,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727097883] [2022-11-25 23:57:49,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:49,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:49,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:49,531 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:49,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:49,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727097883] [2022-11-25 23:57:49,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727097883] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:49,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377233946] [2022-11-25 23:57:49,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:57:49,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:49,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:49,534 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:49,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:57:49,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:57:49,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:49,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:57:49,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:49,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:49,790 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:49,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377233946] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:49,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614021144] [2022-11-25 23:57:49,792 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:49,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:49,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:49,793 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:49,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:49,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:49,822 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:49,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:49,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:49,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:57:49,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:49,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:57:49,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:49,901 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:57:49,925 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:57:49,925 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:57:49,981 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 18 treesize of output 14 [2022-11-25 23:57:50,033 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:50,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '871#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:50,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:50,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:50,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-25 23:57:50,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261458720] [2022-11-25 23:57:50,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:50,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:57:50,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:50,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:57:50,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:57:50,308 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 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) [2022-11-25 23:57:50,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:50,396 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-11-25 23:57:50,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:57:50,397 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 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 18 [2022-11-25 23:57:50,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:50,398 INFO L225 Difference]: With dead ends: 41 [2022-11-25 23:57:50,398 INFO L226 Difference]: Without dead ends: 26 [2022-11-25 23:57:50,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:57:50,399 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 16 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:50,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:57:50,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-25 23:57:50,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-11-25 23:57:50,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 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) [2022-11-25 23:57:50,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-25 23:57:50,405 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-11-25 23:57:50,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:50,406 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-25 23:57:50,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 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) [2022-11-25 23:57:50,406 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-25 23:57:50,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-25 23:57:50,407 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:50,407 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-25 23:57:50,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:50,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 23:57:50,612 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:50,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:50,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1950268161, now seen corresponding path program 6 times [2022-11-25 23:57:50,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:50,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059584655] [2022-11-25 23:57:50,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:50,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:50,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:51,008 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:51,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:51,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059584655] [2022-11-25 23:57:51,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059584655] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:51,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664574548] [2022-11-25 23:57:51,009 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:57:51,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:51,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:51,011 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:51,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:57:51,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:57:51,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:51,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-25 23:57:51,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:51,173 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 13 treesize of output 9 [2022-11-25 23:57:51,434 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:51,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:51,568 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 16 treesize of output 14 [2022-11-25 23:57:51,570 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 24 treesize of output 20 [2022-11-25 23:57:51,577 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 16 treesize of output 14 [2022-11-25 23:57:51,580 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 24 treesize of output 20 [2022-11-25 23:57:51,603 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:51,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664574548] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:51,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1778497282] [2022-11-25 23:57:51,607 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:51,607 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:51,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:51,610 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:51,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:51,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:51,641 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:51,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:51,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:51,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:57:51,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:51,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:51,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:51,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:51,743 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:51,743 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:51,792 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 18 treesize of output 14 [2022-11-25 23:57:51,847 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:52,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1100#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:52,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:52,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:52,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 25 [2022-11-25 23:57:52,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923525695] [2022-11-25 23:57:52,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:52,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:57:52,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:52,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:57:52,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=774, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:57:52,365 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 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) [2022-11-25 23:57:52,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:52,699 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-11-25 23:57:52,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 23:57:52,700 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 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 19 [2022-11-25 23:57:52,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:52,701 INFO L225 Difference]: With dead ends: 27 [2022-11-25 23:57:52,701 INFO L226 Difference]: Without dead ends: 25 [2022-11-25 23:57:52,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 32 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:57:52,702 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 31 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:52,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 54 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:57:52,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-25 23:57:52,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2022-11-25 23:57:52,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 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) [2022-11-25 23:57:52,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-11-25 23:57:52,708 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2022-11-25 23:57:52,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:52,708 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-11-25 23:57:52,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 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) [2022-11-25 23:57:52,709 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-11-25 23:57:52,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:57:52,709 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:52,710 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-25 23:57:52,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:52,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:52,916 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:52,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:52,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1874002468, now seen corresponding path program 7 times [2022-11-25 23:57:52,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:52,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530749360] [2022-11-25 23:57:52,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:52,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:52,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:53,062 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:53,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:53,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530749360] [2022-11-25 23:57:53,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530749360] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:53,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125792483] [2022-11-25 23:57:53,063 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:57:53,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:53,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:53,064 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:53,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:57:53,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:53,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:57:53,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:53,276 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:53,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:53,374 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:53,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125792483] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:53,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365341851] [2022-11-25 23:57:53,376 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:53,377 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:53,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:53,377 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:53,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:53,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:53,416 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:57:53,416 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:57:53,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:53,445 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:53,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:53,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:53,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:57:53,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:53,516 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:57:53,538 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:57:53,539 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:57:53,598 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 18 treesize of output 14 [2022-11-25 23:57:53,671 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:53,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1339#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:53,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:53,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:53,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-25 23:57:53,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055378678] [2022-11-25 23:57:53,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:53,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 23:57:53,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:53,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 23:57:53,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:57:53,958 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 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) [2022-11-25 23:57:54,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:54,081 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-11-25 23:57:54,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 23:57:54,086 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 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 22 [2022-11-25 23:57:54,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:54,087 INFO L225 Difference]: With dead ends: 48 [2022-11-25 23:57:54,087 INFO L226 Difference]: Without dead ends: 30 [2022-11-25 23:57:54,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 9 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-11-25 23:57:54,088 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 26 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:54,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 49 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:57:54,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-25 23:57:54,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-11-25 23:57:54,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 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) [2022-11-25 23:57:54,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-25 23:57:54,094 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-11-25 23:57:54,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:54,095 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-25 23:57:54,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 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) [2022-11-25 23:57:54,095 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-25 23:57:54,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 23:57:54,096 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:54,096 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-25 23:57:54,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:54,301 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:54,301 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:54,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:54,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1951681086, now seen corresponding path program 8 times [2022-11-25 23:57:54,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:54,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397582664] [2022-11-25 23:57:54,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:54,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:54,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:54,696 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:54,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:54,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397582664] [2022-11-25 23:57:54,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397582664] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:54,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300591516] [2022-11-25 23:57:54,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:57:54,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:54,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:54,698 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:54,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:57:54,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:57:54,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:54,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-25 23:57:54,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:55,009 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 13 treesize of output 9 [2022-11-25 23:57:55,398 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:55,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:55,727 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 16 treesize of output 14 [2022-11-25 23:57:55,730 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 24 treesize of output 20 [2022-11-25 23:57:55,920 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:55,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300591516] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:55,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144760543] [2022-11-25 23:57:55,922 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:55,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:55,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:55,923 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:55,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:55,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:55,950 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:57:55,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:57:55,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:55,980 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:55,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:56,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:56,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:56,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:56,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:56,075 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:56,076 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:56,117 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 18 treesize of output 14 [2022-11-25 23:57:56,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:56,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1624#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:56,587 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:56,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:56,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 39 [2022-11-25 23:57:56,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428932930] [2022-11-25 23:57:56,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:56,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 23:57:56,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:56,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 23:57:56,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1691, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 23:57:56,590 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 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) [2022-11-25 23:57:58,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:57:58,060 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2022-11-25 23:57:58,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-25 23:57:58,061 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 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 23 [2022-11-25 23:57:58,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:57:58,061 INFO L225 Difference]: With dead ends: 60 [2022-11-25 23:57:58,062 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 23:57:58,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=629, Invalid=4627, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 23:57:58,064 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 69 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:57:58,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 89 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:57:58,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 23:57:58,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 43. [2022-11-25 23:57:58,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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) [2022-11-25 23:57:58,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-11-25 23:57:58,074 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 23 [2022-11-25 23:57:58,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:57:58,075 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-11-25 23:57:58,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 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) [2022-11-25 23:57:58,075 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-11-25 23:57:58,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 23:57:58,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:57:58,076 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-11-25 23:57:58,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:57:58,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:58,282 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:57:58,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:57:58,282 INFO L85 PathProgramCache]: Analyzing trace with hash -550382495, now seen corresponding path program 9 times [2022-11-25 23:57:58,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:57:58,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730162971] [2022-11-25 23:57:58,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:57:58,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:57:58,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:58,771 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:58,771 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:58,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730162971] [2022-11-25 23:57:58,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730162971] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:58,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476239591] [2022-11-25 23:57:58,772 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:57:58,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:58,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:58,773 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:58,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:57:58,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:57:58,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:58,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-25 23:57:58,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:58,921 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 15 treesize of output 11 [2022-11-25 23:57:59,236 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 47 treesize of output 23 [2022-11-25 23:57:59,263 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:59,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:59,443 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 16 treesize of output 14 [2022-11-25 23:57:59,446 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 24 treesize of output 20 [2022-11-25 23:57:59,452 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 16 treesize of output 14 [2022-11-25 23:57:59,455 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 24 treesize of output 20 [2022-11-25 23:57:59,484 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:59,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476239591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:59,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068890055] [2022-11-25 23:57:59,487 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:57:59,487 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:59,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:59,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:59,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:59,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:59,521 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:57:59,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:57:59,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:59,554 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:57:59,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:57:59,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:59,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:57:59,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:59,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:59,639 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:57:59,639 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:57:59,678 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 18 treesize of output 14 [2022-11-25 23:57:59,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:00,107 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2013#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:00,107 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:00,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:00,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 25 [2022-11-25 23:58:00,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294803223] [2022-11-25 23:58:00,108 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:00,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:58:00,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:00,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:58:00,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:58:00,110 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 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) [2022-11-25 23:58:00,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:00,686 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-11-25 23:58:00,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 23:58:00,686 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 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 27 [2022-11-25 23:58:00,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:00,687 INFO L225 Difference]: With dead ends: 69 [2022-11-25 23:58:00,687 INFO L226 Difference]: Without dead ends: 67 [2022-11-25 23:58:00,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=176, Invalid=1630, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:58:00,689 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:00,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 137 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:58:00,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-25 23:58:00,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 43. [2022-11-25 23:58:00,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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) [2022-11-25 23:58:00,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-11-25 23:58:00,701 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 27 [2022-11-25 23:58:00,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:00,702 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-11-25 23:58:00,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 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) [2022-11-25 23:58:00,702 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-11-25 23:58:00,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-25 23:58:00,703 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:00,703 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2022-11-25 23:58:00,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:00,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 23:58:00,909 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:00,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:00,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1745021052, now seen corresponding path program 10 times [2022-11-25 23:58:00,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:00,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721864827] [2022-11-25 23:58:00,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:00,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:00,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:01,171 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:01,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:01,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721864827] [2022-11-25 23:58:01,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721864827] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:01,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637776176] [2022-11-25 23:58:01,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:58:01,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:01,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:01,174 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:01,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:58:01,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:01,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:58:01,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:01,467 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:01,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:01,609 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:01,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637776176] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:01,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [584692165] [2022-11-25 23:58:01,611 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:01,611 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:01,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:01,611 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:01,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:01,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:01,636 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:58:01,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:58:01,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:01,663 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:01,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:01,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:01,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:58:01,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:01,726 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:01,748 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:58:01,749 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:58:01,819 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 18 treesize of output 14 [2022-11-25 23:58:01,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:02,184 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2399#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:02,184 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:02,184 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:02,184 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-25 23:58:02,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926535265] [2022-11-25 23:58:02,185 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:02,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:58:02,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:02,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:58:02,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:58:02,186 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 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) [2022-11-25 23:58:02,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:02,491 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2022-11-25 23:58:02,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:58:02,491 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 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 30 [2022-11-25 23:58:02,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:02,492 INFO L225 Difference]: With dead ends: 91 [2022-11-25 23:58:02,492 INFO L226 Difference]: Without dead ends: 38 [2022-11-25 23:58:02,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 13 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=351, Invalid=1371, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 23:58:02,493 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 86 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:02,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 74 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:58:02,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-25 23:58:02,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2022-11-25 23:58:02,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 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) [2022-11-25 23:58:02,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-25 23:58:02,504 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-11-25 23:58:02,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:02,505 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-25 23:58:02,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 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) [2022-11-25 23:58:02,505 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-25 23:58:02,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-25 23:58:02,506 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:02,506 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-11-25 23:58:02,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-25 23:58:02,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:58:02,711 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:02,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:02,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1177967202, now seen corresponding path program 11 times [2022-11-25 23:58:02,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:02,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377411523] [2022-11-25 23:58:02,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:02,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:02,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:03,450 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:03,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:03,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377411523] [2022-11-25 23:58:03,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377411523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:03,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817968963] [2022-11-25 23:58:03,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:03,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:03,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:03,459 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:03,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:58:03,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:58:03,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:03,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:58:03,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:03,807 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 15 treesize of output 11 [2022-11-25 23:58:04,164 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 47 treesize of output 23 [2022-11-25 23:58:04,191 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:04,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:04,340 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 16 treesize of output 14 [2022-11-25 23:58:04,343 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 24 treesize of output 20 [2022-11-25 23:58:04,349 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 16 treesize of output 14 [2022-11-25 23:58:04,355 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 24 treesize of output 20 [2022-11-25 23:58:04,397 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:04,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817968963] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:04,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130980010] [2022-11-25 23:58:04,399 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:04,399 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:04,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:04,400 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:04,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:04,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:04,432 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:04,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:04,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:04,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:04,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:04,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:04,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:04,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:04,525 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:04,526 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:04,566 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 18 treesize of output 14 [2022-11-25 23:58:04,613 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:04,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2806#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:04,999 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:04,999 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:04,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 26 [2022-11-25 23:58:04,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033830330] [2022-11-25 23:58:04,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:05,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:58:05,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:05,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:58:05,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:58:05,001 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 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) [2022-11-25 23:58:05,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:05,537 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-11-25 23:58:05,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:58:05,539 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 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 31 [2022-11-25 23:58:05,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:05,540 INFO L225 Difference]: With dead ends: 39 [2022-11-25 23:58:05,540 INFO L226 Difference]: Without dead ends: 37 [2022-11-25 23:58:05,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 23:58:05,541 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:05,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 147 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:58:05,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-25 23:58:05,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2022-11-25 23:58:05,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 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) [2022-11-25 23:58:05,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-11-25 23:58:05,550 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2022-11-25 23:58:05,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:05,551 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-11-25 23:58:05,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 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) [2022-11-25 23:58:05,551 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-11-25 23:58:05,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-25 23:58:05,551 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:05,551 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2022-11-25 23:58:05,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:05,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:05,757 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:05,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:05,757 INFO L85 PathProgramCache]: Analyzing trace with hash -1352067365, now seen corresponding path program 12 times [2022-11-25 23:58:05,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:05,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915469055] [2022-11-25 23:58:05,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:05,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:05,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:06,026 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:06,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:06,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915469055] [2022-11-25 23:58:06,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915469055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:06,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664657444] [2022-11-25 23:58:06,027 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:58:06,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:06,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:06,028 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:06,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:58:06,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:58:06,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:06,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:58:06,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:06,417 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:06,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:06,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664657444] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:06,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1775051939] [2022-11-25 23:58:06,614 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:06,614 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:06,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:06,615 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:06,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:06,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:06,645 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:06,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:06,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:06,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:06,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:06,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:06,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:06,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:06,735 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:06,736 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:06,772 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 18 treesize of output 14 [2022-11-25 23:58:06,816 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:07,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3164#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:07,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:07,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:07,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-25 23:58:07,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448323138] [2022-11-25 23:58:07,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:07,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 23:58:07,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:07,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 23:58:07,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:58:07,132 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 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) [2022-11-25 23:58:07,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:07,330 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-11-25 23:58:07,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:58:07,332 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 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) Word has length 34 [2022-11-25 23:58:07,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:07,332 INFO L225 Difference]: With dead ends: 69 [2022-11-25 23:58:07,332 INFO L226 Difference]: Without dead ends: 42 [2022-11-25 23:58:07,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=319, Invalid=1241, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:58:07,334 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 80 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:07,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 64 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:58:07,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-25 23:58:07,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2022-11-25 23:58:07,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 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) [2022-11-25 23:58:07,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-11-25 23:58:07,345 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2022-11-25 23:58:07,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:07,346 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-11-25 23:58:07,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 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) [2022-11-25 23:58:07,346 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-11-25 23:58:07,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 23:58:07,347 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:07,347 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-11-25 23:58:07,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:07,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 23:58:07,553 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:07,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:07,553 INFO L85 PathProgramCache]: Analyzing trace with hash -2128271935, now seen corresponding path program 13 times [2022-11-25 23:58:07,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:07,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376461279] [2022-11-25 23:58:07,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:07,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:07,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:08,208 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:08,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:08,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376461279] [2022-11-25 23:58:08,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376461279] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:08,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237873326] [2022-11-25 23:58:08,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:58:08,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:08,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:08,211 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:08,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:58:08,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:08,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-25 23:58:08,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:08,587 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 13 treesize of output 9 [2022-11-25 23:58:09,111 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:09,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:09,292 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 16 treesize of output 14 [2022-11-25 23:58:09,294 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 24 treesize of output 20 [2022-11-25 23:58:09,300 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 16 treesize of output 14 [2022-11-25 23:58:09,303 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 24 treesize of output 20 [2022-11-25 23:58:09,342 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:09,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237873326] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:09,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071062545] [2022-11-25 23:58:09,344 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:09,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:09,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:09,345 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:09,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:09,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:09,379 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:09,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:09,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:09,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:09,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:09,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:09,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:09,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:09,469 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:09,469 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:09,507 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 18 treesize of output 14 [2022-11-25 23:58:09,558 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:09,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3575#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:09,972 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:09,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:09,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2022-11-25 23:58:09,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023644492] [2022-11-25 23:58:09,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:09,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 23:58:09,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:09,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 23:58:09,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1762, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 23:58:09,974 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 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) [2022-11-25 23:58:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:10,613 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2022-11-25 23:58:10,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-25 23:58:10,613 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 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 35 [2022-11-25 23:58:10,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:10,614 INFO L225 Difference]: With dead ends: 43 [2022-11-25 23:58:10,614 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 23:58:10,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=218, Invalid=2752, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 23:58:10,615 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:10,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 199 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:58:10,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 23:58:10,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2022-11-25 23:58:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 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) [2022-11-25 23:58:10,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-11-25 23:58:10,626 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2022-11-25 23:58:10,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:10,627 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-11-25 23:58:10,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 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) [2022-11-25 23:58:10,627 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-11-25 23:58:10,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-25 23:58:10,628 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:10,628 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1] [2022-11-25 23:58:10,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:10,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 23:58:10,831 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:10,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:10,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1037198564, now seen corresponding path program 14 times [2022-11-25 23:58:10,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:10,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437405731] [2022-11-25 23:58:10,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:10,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:10,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:11,134 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:11,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:11,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437405731] [2022-11-25 23:58:11,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437405731] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:11,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334748716] [2022-11-25 23:58:11,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:11,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:11,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:11,147 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:11,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:58:11,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-25 23:58:11,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:11,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:58:11,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:11,775 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:11,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:11,981 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:11,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334748716] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:11,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1855144258] [2022-11-25 23:58:11,983 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:11,983 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:11,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:11,984 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:11,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:11,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:12,012 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:12,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:12,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:12,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:12,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:12,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:58:12,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:12,101 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:12,124 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:58:12,125 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:58:12,193 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 18 treesize of output 14 [2022-11-25 23:58:12,239 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:12,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3974#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:12,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:12,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:12,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-25 23:58:12,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134632786] [2022-11-25 23:58:12,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:12,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 23:58:12,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:12,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 23:58:12,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1012, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 23:58:12,562 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 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) [2022-11-25 23:58:12,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:12,766 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-11-25 23:58:12,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 23:58:12,766 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 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 38 [2022-11-25 23:58:12,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:12,767 INFO L225 Difference]: With dead ends: 76 [2022-11-25 23:58:12,767 INFO L226 Difference]: Without dead ends: 46 [2022-11-25 23:58:12,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=388, Invalid=1504, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 23:58:12,769 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 60 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:12,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 78 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:58:12,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-25 23:58:12,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-11-25 23:58:12,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 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) [2022-11-25 23:58:12,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-25 23:58:12,783 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-11-25 23:58:12,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:12,783 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-25 23:58:12,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 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) [2022-11-25 23:58:12,783 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-25 23:58:12,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-25 23:58:12,784 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:12,784 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-11-25 23:58:12,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-25 23:58:12,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:58:12,990 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:12,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:12,991 INFO L85 PathProgramCache]: Analyzing trace with hash 668714754, now seen corresponding path program 15 times [2022-11-25 23:58:12,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:12,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391199808] [2022-11-25 23:58:12,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:12,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:13,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:13,777 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:13,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:13,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391199808] [2022-11-25 23:58:13,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391199808] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:13,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55323149] [2022-11-25 23:58:13,778 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:58:13,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:13,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:13,787 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:13,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:58:13,943 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:58:13,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:13,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-25 23:58:13,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:13,981 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 15 treesize of output 11 [2022-11-25 23:58:14,505 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 47 treesize of output 23 [2022-11-25 23:58:14,538 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:14,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:14,792 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 16 treesize of output 14 [2022-11-25 23:58:14,794 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 24 treesize of output 20 [2022-11-25 23:58:14,800 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 16 treesize of output 14 [2022-11-25 23:58:14,803 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 24 treesize of output 20 [2022-11-25 23:58:14,846 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:14,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55323149] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:14,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [349645283] [2022-11-25 23:58:14,848 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:14,848 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:14,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:14,849 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:14,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:14,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:14,885 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:14,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:14,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:14,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:14,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:14,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:14,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:14,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:14,982 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:14,982 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:15,024 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 18 treesize of output 14 [2022-11-25 23:58:15,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:15,900 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4422#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:15,900 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:15,900 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:15,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 34 [2022-11-25 23:58:15,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055582662] [2022-11-25 23:58:15,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:15,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-25 23:58:15,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:15,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-25 23:58:15,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1373, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:58:15,906 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 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) [2022-11-25 23:58:16,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:16,724 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-11-25 23:58:16,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 23:58:16,724 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 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) Word has length 39 [2022-11-25 23:58:16,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:16,725 INFO L225 Difference]: With dead ends: 47 [2022-11-25 23:58:16,725 INFO L226 Difference]: Without dead ends: 45 [2022-11-25 23:58:16,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 86 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=213, Invalid=2543, Unknown=0, NotChecked=0, Total=2756 [2022-11-25 23:58:16,727 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:16,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 211 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:58:16,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-25 23:58:16,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-11-25 23:58:16,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 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) [2022-11-25 23:58:16,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-11-25 23:58:16,740 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2022-11-25 23:58:16,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:16,741 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-11-25 23:58:16,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 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) [2022-11-25 23:58:16,741 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-11-25 23:58:16,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 23:58:16,742 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:16,742 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1] [2022-11-25 23:58:16,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:16,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:16,948 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:16,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:16,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1627711035, now seen corresponding path program 16 times [2022-11-25 23:58:16,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:16,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271521545] [2022-11-25 23:58:16,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:16,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:16,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:17,316 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:17,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:17,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271521545] [2022-11-25 23:58:17,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271521545] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:17,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473900758] [2022-11-25 23:58:17,317 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:58:17,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:17,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:17,319 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:17,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:58:17,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:17,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:58:17,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:17,763 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:17,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:18,024 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:18,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473900758] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:18,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1615849678] [2022-11-25 23:58:18,026 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:18,026 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:18,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:18,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:18,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:18,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:18,067 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:58:18,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:58:18,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:18,096 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:18,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:18,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:18,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:58:18,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:18,170 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:18,194 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:58:18,194 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:58:18,260 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 18 treesize of output 14 [2022-11-25 23:58:18,305 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:18,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4866#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:18,619 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:18,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:18,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-25 23:58:18,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605646452] [2022-11-25 23:58:18,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:18,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-25 23:58:18,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:18,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-25 23:58:18,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1189, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:58:18,622 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 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) [2022-11-25 23:58:18,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:18,873 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2022-11-25 23:58:18,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:58:18,873 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 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 42 [2022-11-25 23:58:18,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:18,874 INFO L225 Difference]: With dead ends: 83 [2022-11-25 23:58:18,874 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 23:58:18,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=464, Invalid=1792, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 23:58:18,876 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 78 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:18,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 83 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:58:18,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 23:58:18,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2022-11-25 23:58:18,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 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) [2022-11-25 23:58:18,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-11-25 23:58:18,885 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-11-25 23:58:18,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:18,885 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-11-25 23:58:18,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 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) [2022-11-25 23:58:18,886 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-11-25 23:58:18,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 23:58:18,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:18,887 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-25 23:58:18,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:19,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:58:19,091 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:19,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:19,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1437683935, now seen corresponding path program 17 times [2022-11-25 23:58:19,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:19,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705830519] [2022-11-25 23:58:19,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:19,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:19,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:19,918 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:19,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:19,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705830519] [2022-11-25 23:58:19,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705830519] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:19,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050763501] [2022-11-25 23:58:19,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:19,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:19,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:19,919 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:19,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 23:58:20,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-25 23:58:20,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:20,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 23:58:20,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:20,624 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 13 treesize of output 9 [2022-11-25 23:58:21,291 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-25 23:58:21,292 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 42 treesize of output 23 [2022-11-25 23:58:21,332 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 117 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:21,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:22,435 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 21 treesize of output 19 [2022-11-25 23:58:22,439 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 39 treesize of output 32 [2022-11-25 23:58:23,159 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 84 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:23,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050763501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:23,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823362958] [2022-11-25 23:58:23,160 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:23,160 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:23,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:23,161 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:23,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:23,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,187 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:23,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:23,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:23,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:23,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,300 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:23,300 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:23,335 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 18 treesize of output 14 [2022-11-25 23:58:23,380 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:23,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5389#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:23,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:23,921 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:23,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 67 [2022-11-25 23:58:23,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192343947] [2022-11-25 23:58:23,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:23,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-25 23:58:23,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:23,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-25 23:58:23,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=4677, Unknown=0, NotChecked=0, Total=5112 [2022-11-25 23:58:23,926 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 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) [2022-11-25 23:58:27,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:27,638 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2022-11-25 23:58:27,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-25 23:58:27,639 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 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 43 [2022-11-25 23:58:27,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:27,640 INFO L225 Difference]: With dead ends: 83 [2022-11-25 23:58:27,640 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 23:58:27,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3329 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1191, Invalid=12381, Unknown=0, NotChecked=0, Total=13572 [2022-11-25 23:58:27,644 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 150 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 1137 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:27,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 338 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1137 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:58:27,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 23:58:27,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2022-11-25 23:58:27,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 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) [2022-11-25 23:58:27,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-25 23:58:27,673 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 43 [2022-11-25 23:58:27,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:27,673 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-25 23:58:27,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 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) [2022-11-25 23:58:27,674 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-25 23:58:27,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-25 23:58:27,674 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:27,675 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-25 23:58:27,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:27,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:27,879 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:27,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:27,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1722153890, now seen corresponding path program 18 times [2022-11-25 23:58:27,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:27,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879901911] [2022-11-25 23:58:27,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:27,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:27,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:28,812 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:28,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:28,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879901911] [2022-11-25 23:58:28,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879901911] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:28,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574140916] [2022-11-25 23:58:28,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:58:28,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:28,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:28,814 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:28,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 23:58:29,016 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:58:29,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:29,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-25 23:58:29,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:29,056 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 15 treesize of output 11 [2022-11-25 23:58:29,711 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 47 treesize of output 23 [2022-11-25 23:58:29,750 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:29,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:30,019 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 16 treesize of output 14 [2022-11-25 23:58:30,021 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 24 treesize of output 20 [2022-11-25 23:58:30,027 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 16 treesize of output 14 [2022-11-25 23:58:30,029 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 24 treesize of output 20 [2022-11-25 23:58:30,076 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:30,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574140916] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:30,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598474038] [2022-11-25 23:58:30,078 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:30,078 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:30,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:30,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:30,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:30,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:30,108 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:30,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:30,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:30,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:30,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:30,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:58:30,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:30,178 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:30,202 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:58:30,203 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:58:30,268 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 18 treesize of output 14 [2022-11-25 23:58:30,311 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:30,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5989#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:30,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:30,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:30,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 40 [2022-11-25 23:58:30,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790531266] [2022-11-25 23:58:30,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:30,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 23:58:30,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:30,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 23:58:30,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1855, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:58:30,777 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 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) [2022-11-25 23:58:31,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:31,848 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-11-25 23:58:31,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-25 23:58:31,848 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 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 47 [2022-11-25 23:58:31,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:31,849 INFO L225 Difference]: With dead ends: 55 [2022-11-25 23:58:31,849 INFO L226 Difference]: Without dead ends: 53 [2022-11-25 23:58:31,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 117 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=253, Invalid=3529, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 23:58:31,851 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:31,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 279 Invalid, 1043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:58:31,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-25 23:58:31,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2022-11-25 23:58:31,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:31,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-11-25 23:58:31,868 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2022-11-25 23:58:31,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:31,868 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-11-25 23:58:31,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 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) [2022-11-25 23:58:31,868 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-11-25 23:58:31,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-25 23:58:31,869 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:31,869 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1] [2022-11-25 23:58:31,880 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-25 23:58:32,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:32,075 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:32,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:32,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1306979739, now seen corresponding path program 19 times [2022-11-25 23:58:32,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:32,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965487716] [2022-11-25 23:58:32,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:32,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:32,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:32,570 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:32,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:32,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965487716] [2022-11-25 23:58:32,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965487716] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:32,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825001442] [2022-11-25 23:58:32,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:58:32,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:32,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:32,572 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:32,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 23:58:32,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:32,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:58:32,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:33,101 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:33,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:33,387 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:33,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825001442] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:33,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1308898303] [2022-11-25 23:58:33,389 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:33,389 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:33,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:33,390 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:33,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:33,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:33,421 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:33,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:33,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:33,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:33,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:33,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:33,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:33,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:33,505 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:33,506 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:33,545 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 18 treesize of output 14 [2022-11-25 23:58:33,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:33,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6517#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:33,939 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:33,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:33,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-25 23:58:33,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598369596] [2022-11-25 23:58:33,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:33,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 23:58:33,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:33,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 23:58:33,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:58:33,941 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 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) [2022-11-25 23:58:34,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:34,238 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-11-25 23:58:34,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:58:34,239 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 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 50 [2022-11-25 23:58:34,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:34,240 INFO L225 Difference]: With dead ends: 97 [2022-11-25 23:58:34,240 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 23:58:34,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 108 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=637, Invalid=2443, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:58:34,241 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 106 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:34,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 93 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:58:34,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 23:58:34,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2022-11-25 23:58:34,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 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) [2022-11-25 23:58:34,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-25 23:58:34,258 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-11-25 23:58:34,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:34,258 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-25 23:58:34,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 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) [2022-11-25 23:58:34,258 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-25 23:58:34,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 23:58:34,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:34,259 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-25 23:58:34,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:34,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:34,459 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:34,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:34,460 INFO L85 PathProgramCache]: Analyzing trace with hash -362516351, now seen corresponding path program 20 times [2022-11-25 23:58:34,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:34,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24358152] [2022-11-25 23:58:34,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:34,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:34,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:35,511 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:35,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:35,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24358152] [2022-11-25 23:58:35,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24358152] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:35,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297818973] [2022-11-25 23:58:35,512 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:35,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:35,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:35,513 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:35,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 23:58:36,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-25 23:58:36,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:36,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-25 23:58:36,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:36,656 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 13 treesize of output 9 [2022-11-25 23:58:36,710 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 23 treesize of output 22 [2022-11-25 23:58:37,765 INFO L321 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2022-11-25 23:58:37,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 26 [2022-11-25 23:58:37,812 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 176 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:37,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:39,300 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 28 treesize of output 26 [2022-11-25 23:58:39,303 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 84 treesize of output 78 [2022-11-25 23:58:40,232 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 165 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:58:40,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297818973] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:40,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [913406569] [2022-11-25 23:58:40,234 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:58:40,234 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:40,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:40,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:40,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:40,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:40,265 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:58:40,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:58:40,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:40,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:58:40,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:40,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:58:40,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:40,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:40,358 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:58:40,358 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:58:40,403 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 18 treesize of output 14 [2022-11-25 23:58:40,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:41,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7136#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:41,042 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:41,043 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:41,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2022-11-25 23:58:41,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515385833] [2022-11-25 23:58:41,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:41,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-25 23:58:41,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:41,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-25 23:58:41,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=6369, Unknown=0, NotChecked=0, Total=6972 [2022-11-25 23:58:41,046 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 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) [2022-11-25 23:58:51,161 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-11-25 23:59:06,264 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|)) (.cse4 (* |c_ULTIMATE.start_main_~i~0#1| 4))) (let ((.cse3 (select .cse0 (+ .cse4 |c_ULTIMATE.start_main_~#a~0#1.offset| 4))) (.cse2 (+ |c_ULTIMATE.start_main_~i~0#1| 1)) (.cse1 (select .cse0 (+ .cse4 |c_ULTIMATE.start_main_~#a~0#1.offset|)))) (and (= (select .cse0 (+ 44 |c_ULTIMATE.start_main_~#a~0#1.offset|)) 11) (= (select .cse0 (+ 40 |c_ULTIMATE.start_main_~#a~0#1.offset|)) 10) (not (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) (<= 10 |c_ULTIMATE.start_main_~i~0#1|) (forall ((|v_ULTIMATE.start_main_~i~0#1_632| Int)) (or (< |c_ULTIMATE.start_main_~i~0#1| |v_ULTIMATE.start_main_~i~0#1_632|) (= (select (store .cse0 (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* 4 |c_ULTIMATE.start_main_~k~0#1|)) |c_ULTIMATE.start_main_~k~0#1|) (+ (* |v_ULTIMATE.start_main_~i~0#1_632| 4) |c_ULTIMATE.start_main_~#a~0#1.offset|)) |v_ULTIMATE.start_main_~i~0#1_632|) (< |v_ULTIMATE.start_main_~i~0#1_632| 11))) (<= .cse1 |c_ULTIMATE.start_main_~i~0#1|) (<= .cse2 .cse3) (<= .cse3 .cse2) (<= |c_ULTIMATE.start_main_~i~0#1| .cse1) (<= c_~N~0 12)))) is different from false [2022-11-25 23:59:16,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:16,776 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2022-11-25 23:59:16,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-25 23:59:16,776 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 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 51 [2022-11-25 23:59:16,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:16,777 INFO L225 Difference]: With dead ends: 135 [2022-11-25 23:59:16,777 INFO L226 Difference]: Without dead ends: 59 [2022-11-25 23:59:16,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 7346 ImplicationChecksByTransitivity, 34.7s TimeCoverageRelationStatistics Valid=2218, Invalid=24836, Unknown=10, NotChecked=326, Total=27390 [2022-11-25 23:59:16,780 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 199 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 1618 mSolverCounterSat, 89 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 1711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 1618 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:16,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 463 Invalid, 1711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 1618 Invalid, 3 Unknown, 1 Unchecked, 5.2s Time] [2022-11-25 23:59:16,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-25 23:59:16,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2022-11-25 23:59:16,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 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) [2022-11-25 23:59:16,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-11-25 23:59:16,801 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 51 [2022-11-25 23:59:16,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:16,802 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-11-25 23:59:16,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 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) [2022-11-25 23:59:16,802 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-11-25 23:59:16,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-25 23:59:16,803 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:16,803 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 12, 12, 1, 1, 1, 1, 1] [2022-11-25 23:59:16,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:17,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-25 23:59:17,010 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:17,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:17,010 INFO L85 PathProgramCache]: Analyzing trace with hash -784509668, now seen corresponding path program 21 times [2022-11-25 23:59:17,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:17,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751037013] [2022-11-25 23:59:17,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:17,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:17,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:18,525 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:18,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:18,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751037013] [2022-11-25 23:59:18,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751037013] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:18,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96909868] [2022-11-25 23:59:18,526 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:59:18,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:18,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:18,529 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:18,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 23:59:18,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:59:18,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:18,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-25 23:59:18,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:19,244 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 13 treesize of output 9 [2022-11-25 23:59:19,305 INFO L321 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-25 23:59:19,305 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 24 [2022-11-25 23:59:20,205 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:20,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:21,125 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 23 treesize of output 21 [2022-11-25 23:59:21,128 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 58 treesize of output 54 [2022-11-25 23:59:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:21,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96909868] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:21,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457541061] [2022-11-25 23:59:21,170 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:21,170 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:21,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:21,170 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:21,171 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:21,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:21,196 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:59:21,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:59:21,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:21,223 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:21,223 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:21,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:21,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:21,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:21,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:21,304 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:21,304 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:21,347 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 18 treesize of output 14 [2022-11-25 23:59:21,407 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:22,756 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7987#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:22,756 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:22,756 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:22,756 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 76 [2022-11-25 23:59:22,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765286102] [2022-11-25 23:59:22,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:22,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-25 23:59:22,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:22,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-25 23:59:22,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=6208, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:59:22,759 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 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) [2022-11-25 23:59:26,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:26,517 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2022-11-25 23:59:26,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-25 23:59:26,518 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 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 56 [2022-11-25 23:59:26,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:26,518 INFO L225 Difference]: With dead ends: 64 [2022-11-25 23:59:26,519 INFO L226 Difference]: Without dead ends: 62 [2022-11-25 23:59:26,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 105 SyntacticMatches, 13 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3672 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=678, Invalid=11978, Unknown=0, NotChecked=0, Total=12656 [2022-11-25 23:59:26,520 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 179 mSDsluCounter, 543 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 1992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:26,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 557 Invalid, 1992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1974 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:59:26,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-25 23:59:26,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-11-25 23:59:26,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 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) [2022-11-25 23:59:26,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-11-25 23:59:26,534 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2022-11-25 23:59:26,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:26,534 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-11-25 23:59:26,534 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 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) [2022-11-25 23:59:26,534 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-11-25 23:59:26,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 23:59:26,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:26,535 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-25 23:59:26,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:26,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-25 23:59:26,739 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:26,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:26,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1889298913, now seen corresponding path program 22 times [2022-11-25 23:59:26,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:26,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870111567] [2022-11-25 23:59:26,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:26,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:26,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:28,096 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:28,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:28,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870111567] [2022-11-25 23:59:28,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870111567] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:28,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702186464] [2022-11-25 23:59:28,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:59:28,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:28,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:28,099 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:28,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 23:59:28,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:28,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-25 23:59:28,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:28,880 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 13 treesize of output 9 [2022-11-25 23:59:29,960 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:29,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:30,241 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 16 treesize of output 14 [2022-11-25 23:59:30,243 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 24 treesize of output 20 [2022-11-25 23:59:30,248 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 16 treesize of output 14 [2022-11-25 23:59:30,250 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 24 treesize of output 20 [2022-11-25 23:59:30,312 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:30,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702186464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:30,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659146184] [2022-11-25 23:59:30,314 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:30,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:30,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:30,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:30,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:30,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:30,340 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:59:30,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:59:30,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:30,365 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:30,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:30,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:30,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:30,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:30,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:30,449 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:30,449 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:30,492 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 18 treesize of output 14 [2022-11-25 23:59:30,532 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:31,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8650#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:31,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:31,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:31,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-11-25 23:59:31,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786001016] [2022-11-25 23:59:31,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:31,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-25 23:59:31,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:31,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-25 23:59:31,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=4354, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 23:59:31,118 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 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) [2022-11-25 23:59:32,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:32,669 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-11-25 23:59:32,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-25 23:59:32,670 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 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 59 [2022-11-25 23:59:32,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:32,670 INFO L225 Difference]: With dead ends: 67 [2022-11-25 23:59:32,670 INFO L226 Difference]: Without dead ends: 65 [2022-11-25 23:59:32,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 138 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=338, Invalid=6802, Unknown=0, NotChecked=0, Total=7140 [2022-11-25 23:59:32,671 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 2045 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 631 SdHoareTripleChecker+Invalid, 2060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 2045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:32,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 631 Invalid, 2060 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 2045 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:59:32,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-25 23:59:32,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-11-25 23:59:32,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 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) [2022-11-25 23:59:32,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-11-25 23:59:32,691 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2022-11-25 23:59:32,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:32,691 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-11-25 23:59:32,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 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) [2022-11-25 23:59:32,692 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-11-25 23:59:32,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-25 23:59:32,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:32,692 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1] [2022-11-25 23:59:32,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:32,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:32,893 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:32,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:32,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1437703428, now seen corresponding path program 23 times [2022-11-25 23:59:32,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:32,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235791070] [2022-11-25 23:59:32,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:32,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:32,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:33,599 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:33,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:33,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235791070] [2022-11-25 23:59:33,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235791070] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:33,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69631344] [2022-11-25 23:59:33,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:59:33,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:33,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:33,601 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:33,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 23:59:34,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-25 23:59:34,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:34,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:59:34,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:34,816 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:34,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:35,233 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:35,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69631344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:35,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481180783] [2022-11-25 23:59:35,235 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:35,235 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:35,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:35,235 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:35,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:35,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:35,258 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:59:35,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:59:35,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:35,284 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:35,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:35,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:35,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:35,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:35,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:35,360 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:35,360 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:35,412 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 18 treesize of output 14 [2022-11-25 23:59:35,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:36,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9295#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:36,427 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:36,427 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:36,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-25 23:59:36,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234328671] [2022-11-25 23:59:36,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:36,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-25 23:59:36,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:36,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-25 23:59:36,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=2284, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 23:59:36,430 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 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) [2022-11-25 23:59:36,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:36,835 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2022-11-25 23:59:36,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-25 23:59:36,836 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 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 62 [2022-11-25 23:59:36,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:36,836 INFO L225 Difference]: With dead ends: 118 [2022-11-25 23:59:36,837 INFO L226 Difference]: Without dead ends: 70 [2022-11-25 23:59:36,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 120 SyntacticMatches, 44 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2625 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=949, Invalid=3607, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 23:59:36,838 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 142 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:36,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 121 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:59:36,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-25 23:59:36,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2022-11-25 23:59:36,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 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) [2022-11-25 23:59:36,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-11-25 23:59:36,858 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2022-11-25 23:59:36,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:36,859 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-11-25 23:59:36,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 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) [2022-11-25 23:59:36,859 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-11-25 23:59:36,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-25 23:59:36,859 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:36,859 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-11-25 23:59:36,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-11-25 23:59:37,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-25 23:59:37,060 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:37,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:37,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1179696354, now seen corresponding path program 24 times [2022-11-25 23:59:37,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:37,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062037407] [2022-11-25 23:59:37,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:37,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:37,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:38,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:38,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062037407] [2022-11-25 23:59:38,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062037407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:38,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310494963] [2022-11-25 23:59:38,423 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:59:38,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:38,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:38,424 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:38,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 23:59:38,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:59:38,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:38,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-25 23:59:38,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:38,892 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 15 treesize of output 11 [2022-11-25 23:59:39,934 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 47 treesize of output 23 [2022-11-25 23:59:39,980 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:39,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:40,355 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 16 treesize of output 14 [2022-11-25 23:59:40,357 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 24 treesize of output 20 [2022-11-25 23:59:40,362 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 16 treesize of output 14 [2022-11-25 23:59:40,364 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 24 treesize of output 20 [2022-11-25 23:59:40,423 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:40,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310494963] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:40,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [227841706] [2022-11-25 23:59:40,425 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:40,425 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:40,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:40,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:40,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:40,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:40,468 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:40,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:40,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:40,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:59:40,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:40,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:40,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:40,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:40,550 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:40,550 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:40,591 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 18 treesize of output 14 [2022-11-25 23:59:40,633 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:42,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10013#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:42,174 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:42,175 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:42,175 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 52 [2022-11-25 23:59:42,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689273120] [2022-11-25 23:59:42,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:42,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-25 23:59:42,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:42,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-25 23:59:42,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=3035, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:59:42,177 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 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) [2022-11-25 23:59:43,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:43,947 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2022-11-25 23:59:43,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-25 23:59:43,948 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 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 63 [2022-11-25 23:59:43,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:43,948 INFO L225 Difference]: With dead ends: 71 [2022-11-25 23:59:43,949 INFO L226 Difference]: Without dead ends: 69 [2022-11-25 23:59:43,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 146 SyntacticMatches, 20 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1202 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=313, Invalid=5693, Unknown=0, NotChecked=0, Total=6006 [2022-11-25 23:59:43,950 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 2063 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 2081 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:43,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 570 Invalid, 2081 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2063 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 23:59:43,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-25 23:59:43,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2022-11-25 23:59:43,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 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) [2022-11-25 23:59:43,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-11-25 23:59:43,969 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2022-11-25 23:59:43,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:43,969 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-11-25 23:59:43,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 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) [2022-11-25 23:59:43,970 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-11-25 23:59:43,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-25 23:59:43,970 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:43,971 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2022-11-25 23:59:43,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:44,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 23:59:44,178 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:44,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:44,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1378507685, now seen corresponding path program 25 times [2022-11-25 23:59:44,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:44,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640751635] [2022-11-25 23:59:44,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:44,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:44,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:44,948 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:44,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:44,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640751635] [2022-11-25 23:59:44,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640751635] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:44,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549154414] [2022-11-25 23:59:44,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:59:44,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:44,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:44,951 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:44,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 23:59:45,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:45,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-25 23:59:45,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:45,773 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:45,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:46,236 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:46,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549154414] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:46,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977499003] [2022-11-25 23:59:46,237 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:46,237 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:46,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:46,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:46,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:46,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:46,260 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 23:59:46,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 23:59:46,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:46,285 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:46,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:46,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:46,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:46,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:46,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:46,365 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:46,366 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:46,401 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 18 treesize of output 14 [2022-11-25 23:59:46,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:46,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10705#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:46,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:46,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:46,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-11-25 23:59:46,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810847345] [2022-11-25 23:59:46,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:46,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-25 23:59:46,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:46,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-25 23:59:46,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=2545, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:59:46,843 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 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) [2022-11-25 23:59:47,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:47,270 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2022-11-25 23:59:47,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:59:47,270 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 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 66 [2022-11-25 23:59:47,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:47,271 INFO L225 Difference]: With dead ends: 125 [2022-11-25 23:59:47,271 INFO L226 Difference]: Without dead ends: 74 [2022-11-25 23:59:47,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 144 SyntacticMatches, 31 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1067, Invalid=4045, Unknown=0, NotChecked=0, Total=5112 [2022-11-25 23:59:47,272 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 150 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:47,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 128 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:59:47,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-25 23:59:47,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2022-11-25 23:59:47,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 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) [2022-11-25 23:59:47,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-11-25 23:59:47,294 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2022-11-25 23:59:47,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:47,294 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-11-25 23:59:47,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 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) [2022-11-25 23:59:47,295 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-11-25 23:59:47,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-25 23:59:47,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:47,295 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-25 23:59:47,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:47,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 23:59:47,496 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:47,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:47,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1806474049, now seen corresponding path program 26 times [2022-11-25 23:59:47,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:47,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616599487] [2022-11-25 23:59:47,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:47,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:47,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:49,063 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:49,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:49,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616599487] [2022-11-25 23:59:49,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616599487] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:49,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789764365] [2022-11-25 23:59:49,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:59:49,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:49,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:49,065 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:49,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 23:59:50,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-25 23:59:50,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:50,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-25 23:59:50,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:50,903 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 15 treesize of output 11 [2022-11-25 23:59:52,209 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 47 treesize of output 23 [2022-11-25 23:59:52,266 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:52,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:52,672 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 16 treesize of output 14 [2022-11-25 23:59:52,674 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 24 treesize of output 20 [2022-11-25 23:59:52,681 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 16 treesize of output 14 [2022-11-25 23:59:52,684 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 24 treesize of output 20 [2022-11-25 23:59:52,772 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:52,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789764365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:52,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911752602] [2022-11-25 23:59:52,774 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:52,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:52,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:52,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:52,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:52,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:52,800 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:52,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:52,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:52,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:59:52,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:52,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-25 23:59:52,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:52,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:52,883 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-25 23:59:52,884 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-25 23:59:52,919 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 18 treesize of output 14 [2022-11-25 23:59:52,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:53,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11483#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:53,596 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:53,596 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:53,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 70 [2022-11-25 23:59:53,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693605516] [2022-11-25 23:59:53,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:53,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-25 23:59:53,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:53,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-25 23:59:53,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5340, Unknown=0, NotChecked=0, Total=5550 [2022-11-25 23:59:53,597 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 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) [2022-11-25 23:59:55,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:55,622 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2022-11-25 23:59:55,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-25 23:59:55,622 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 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 67 [2022-11-25 23:59:55,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:55,623 INFO L225 Difference]: With dead ends: 75 [2022-11-25 23:59:55,623 INFO L226 Difference]: Without dead ends: 73 [2022-11-25 23:59:55,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 157 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=355, Invalid=8575, Unknown=0, NotChecked=0, Total=8930 [2022-11-25 23:59:55,624 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 2669 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 2687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:55,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 755 Invalid, 2687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2669 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-25 23:59:55,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-25 23:59:55,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-25 23:59:55,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 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) [2022-11-25 23:59:55,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-11-25 23:59:55,646 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2022-11-25 23:59:55,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:55,646 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-11-25 23:59:55,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 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) [2022-11-25 23:59:55,646 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-11-25 23:59:55,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-25 23:59:55,647 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:55,647 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1] [2022-11-25 23:59:55,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:55,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:55,854 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:55,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:55,855 INFO L85 PathProgramCache]: Analyzing trace with hash 732968348, now seen corresponding path program 27 times [2022-11-25 23:59:55,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:55,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048071682] [2022-11-25 23:59:55,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:55,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:55,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:56,653 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:56,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:56,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048071682] [2022-11-25 23:59:56,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048071682] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:56,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456958247] [2022-11-25 23:59:56,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:59:56,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:56,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:56,655 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:56,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 23:59:57,243 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:59:57,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:57,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 23:59:57,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:58,009 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:58,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:59:58,530 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:58,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456958247] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:59:58,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836935680] [2022-11-25 23:59:58,531 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:59:58,532 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:59:58,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:59:58,532 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:59:58,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:59:58,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:58,563 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:59:58,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 23:59:58,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:58,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-25 23:59:58,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:58,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:59:58,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:59:58,637 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:59:58,662 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-25 23:59:58,662 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-25 23:59:58,703 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 18 treesize of output 14 [2022-11-25 23:59:58,748 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:59,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12212#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:59,193 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:59,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:59:59,193 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-25 23:59:59,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338993087] [2022-11-25 23:59:59,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:59,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-25 23:59:59,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:59,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-25 23:59:59,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=2820, Unknown=0, NotChecked=0, Total=3540 [2022-11-25 23:59:59,195 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 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) [2022-11-25 23:59:59,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:59:59,646 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2022-11-25 23:59:59,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-25 23:59:59,646 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 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 70 [2022-11-25 23:59:59,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:59:59,647 INFO L225 Difference]: With dead ends: 132 [2022-11-25 23:59:59,647 INFO L226 Difference]: Without dead ends: 78 [2022-11-25 23:59:59,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 153 SyntacticMatches, 33 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2384 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1192, Invalid=4508, Unknown=0, NotChecked=0, Total=5700 [2022-11-25 23:59:59,648 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 192 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:59:59,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 113 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:59:59,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-25 23:59:59,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2022-11-25 23:59:59,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 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) [2022-11-25 23:59:59,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-25 23:59:59,670 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 70 [2022-11-25 23:59:59,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:59:59,670 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-25 23:59:59,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 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) [2022-11-25 23:59:59,670 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-25 23:59:59,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-25 23:59:59,671 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:59:59,671 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-25 23:59:59,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 23:59:59,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-25 23:59:59,871 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:59:59,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:59:59,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1513797246, now seen corresponding path program 28 times [2022-11-25 23:59:59,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:59:59,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194740792] [2022-11-25 23:59:59,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:59:59,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:59:59,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:01,535 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:01,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:01,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194740792] [2022-11-26 00:00:01,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194740792] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:01,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039699763] [2022-11-26 00:00:01,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:00:01,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:01,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:01,536 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:01,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-26 00:00:01,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:01,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-26 00:00:01,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:02,536 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 13 treesize of output 9 [2022-11-26 00:00:04,059 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:04,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:04,381 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 16 treesize of output 14 [2022-11-26 00:00:04,385 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 24 treesize of output 20 [2022-11-26 00:00:04,390 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 16 treesize of output 14 [2022-11-26 00:00:04,392 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 24 treesize of output 20 [2022-11-26 00:00:04,459 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:04,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039699763] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:04,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403505043] [2022-11-26 00:00:04,460 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:04,460 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:04,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:04,461 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:04,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:04,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:04,491 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:04,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:04,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:04,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:00:04,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:04,517 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:00:04,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:04,560 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:00:04,584 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:00:04,584 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:00:04,630 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 18 treesize of output 14 [2022-11-26 00:00:04,677 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:05,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13037#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:05,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:05,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:05,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2022-11-26 00:00:05,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624169278] [2022-11-26 00:00:05,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:05,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-26 00:00:05,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:05,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-26 00:00:05,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=6082, Unknown=0, NotChecked=0, Total=6320 [2022-11-26 00:00:05,357 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 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) [2022-11-26 00:00:07,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:07,519 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2022-11-26 00:00:07,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-26 00:00:07,519 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 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 71 [2022-11-26 00:00:07,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:07,520 INFO L225 Difference]: With dead ends: 79 [2022-11-26 00:00:07,520 INFO L226 Difference]: Without dead ends: 77 [2022-11-26 00:00:07,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1824 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=398, Invalid=9502, Unknown=0, NotChecked=0, Total=9900 [2022-11-26 00:00:07,522 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 2972 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 915 SdHoareTripleChecker+Invalid, 2990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:07,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 915 Invalid, 2990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2972 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-26 00:00:07,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-26 00:00:07,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2022-11-26 00:00:07,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 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) [2022-11-26 00:00:07,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2022-11-26 00:00:07,540 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2022-11-26 00:00:07,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:07,540 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2022-11-26 00:00:07,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 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) [2022-11-26 00:00:07,541 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2022-11-26 00:00:07,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-26 00:00:07,541 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:07,541 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1] [2022-11-26 00:00:07,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:07,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:07,748 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:07,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:07,748 INFO L85 PathProgramCache]: Analyzing trace with hash -372354117, now seen corresponding path program 29 times [2022-11-26 00:00:07,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:07,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651948985] [2022-11-26 00:00:07,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:07,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:07,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:08,623 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:08,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:08,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651948985] [2022-11-26 00:00:08,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651948985] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:08,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144959440] [2022-11-26 00:00:08,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:00:08,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:08,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:08,625 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:08,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-26 00:00:10,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-26 00:00:10,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:00:10,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-26 00:00:10,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:11,471 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:11,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:12,041 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:12,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144959440] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:12,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153001088] [2022-11-26 00:00:12,043 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:12,043 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:12,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:12,043 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:12,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:12,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:12,072 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:12,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:12,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:12,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:00:12,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:12,103 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:00:12,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:12,152 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:00:12,177 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:00:12,178 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:00:12,220 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 18 treesize of output 14 [2022-11-26 00:00:12,281 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:12,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13805#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:12,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:12,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:12,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-11-26 00:00:12,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002076744] [2022-11-26 00:00:12,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:12,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-26 00:00:12,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:12,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-26 00:00:12,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=797, Invalid=3109, Unknown=0, NotChecked=0, Total=3906 [2022-11-26 00:00:12,739 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 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) [2022-11-26 00:00:13,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:13,283 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2022-11-26 00:00:13,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-26 00:00:13,287 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 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 74 [2022-11-26 00:00:13,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:13,287 INFO L225 Difference]: With dead ends: 139 [2022-11-26 00:00:13,287 INFO L226 Difference]: Without dead ends: 82 [2022-11-26 00:00:13,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 162 SyntacticMatches, 35 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2642 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1324, Invalid=4996, Unknown=0, NotChecked=0, Total=6320 [2022-11-26 00:00:13,289 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 272 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:13,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 151 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:00:13,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-26 00:00:13,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2022-11-26 00:00:13,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 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) [2022-11-26 00:00:13,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-11-26 00:00:13,318 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2022-11-26 00:00:13,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:13,318 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-11-26 00:00:13,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 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) [2022-11-26 00:00:13,318 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-11-26 00:00:13,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-26 00:00:13,319 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:13,319 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-26 00:00:13,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:13,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:13,523 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:13,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:13,523 INFO L85 PathProgramCache]: Analyzing trace with hash 1774912673, now seen corresponding path program 30 times [2022-11-26 00:00:13,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:13,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438696590] [2022-11-26 00:00:13,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:13,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:13,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:15,347 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:15,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:15,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438696590] [2022-11-26 00:00:15,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438696590] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:15,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995299795] [2022-11-26 00:00:15,348 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:00:15,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:15,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:15,349 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:15,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-26 00:00:15,989 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:00:15,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:00:15,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-26 00:00:15,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:16,923 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 13 treesize of output 9 [2022-11-26 00:00:18,654 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:18,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:19,097 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 16 treesize of output 14 [2022-11-26 00:00:19,099 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 24 treesize of output 20 [2022-11-26 00:00:19,105 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 16 treesize of output 14 [2022-11-26 00:00:19,107 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 24 treesize of output 20 [2022-11-26 00:00:19,178 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:19,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995299795] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:19,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378287202] [2022-11-26 00:00:19,179 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:19,179 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:19,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:19,179 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:19,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:19,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:19,205 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:19,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:19,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:19,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:00:19,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:19,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:00:19,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:19,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:19,310 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:00:19,310 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:00:19,351 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 18 treesize of output 14 [2022-11-26 00:00:19,410 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:21,720 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14678#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:21,720 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:21,720 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:21,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 81 [2022-11-26 00:00:21,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889742308] [2022-11-26 00:00:21,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:21,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-26 00:00:21,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:21,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-26 00:00:21,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=7048, Unknown=0, NotChecked=0, Total=7310 [2022-11-26 00:00:21,723 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 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) [2022-11-26 00:00:24,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:24,114 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2022-11-26 00:00:24,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-26 00:00:24,114 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 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 75 [2022-11-26 00:00:24,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:24,115 INFO L225 Difference]: With dead ends: 83 [2022-11-26 00:00:24,115 INFO L226 Difference]: Without dead ends: 81 [2022-11-26 00:00:24,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 21 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3155 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=464, Invalid=11526, Unknown=0, NotChecked=0, Total=11990 [2022-11-26 00:00:24,117 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 36 mSDsluCounter, 846 mSDsCounter, 0 mSdLazyCounter, 3051 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 865 SdHoareTripleChecker+Invalid, 3072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 3051 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:24,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 865 Invalid, 3072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 3051 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-26 00:00:24,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-26 00:00:24,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2022-11-26 00:00:24,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 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) [2022-11-26 00:00:24,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-11-26 00:00:24,142 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2022-11-26 00:00:24,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:24,143 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-11-26 00:00:24,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 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) [2022-11-26 00:00:24,143 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-11-26 00:00:24,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-26 00:00:24,144 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:24,144 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1] [2022-11-26 00:00:24,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:24,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:24,352 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:24,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:24,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1085853756, now seen corresponding path program 31 times [2022-11-26 00:00:24,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:24,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591339605] [2022-11-26 00:00:24,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:24,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:24,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:25,195 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:25,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:25,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591339605] [2022-11-26 00:00:25,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591339605] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:25,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743138692] [2022-11-26 00:00:25,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:00:25,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:25,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:25,196 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:25,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-26 00:00:25,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:25,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-26 00:00:25,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:26,227 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:26,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:26,855 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:26,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743138692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:26,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2124133761] [2022-11-26 00:00:26,857 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:26,857 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:26,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:26,858 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:26,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:26,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:26,893 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:26,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:26,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:26,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:00:26,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:26,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:00:26,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:26,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:26,973 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:00:26,974 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:00:27,011 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 18 treesize of output 14 [2022-11-26 00:00:27,052 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:27,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15493#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:27,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:27,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:27,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-26 00:00:27,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252671864] [2022-11-26 00:00:27,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:27,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-26 00:00:27,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:27,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-26 00:00:27,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=878, Invalid=3412, Unknown=0, NotChecked=0, Total=4290 [2022-11-26 00:00:27,498 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 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) [2022-11-26 00:00:28,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:28,031 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2022-11-26 00:00:28,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-26 00:00:28,031 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 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 78 [2022-11-26 00:00:28,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:28,032 INFO L225 Difference]: With dead ends: 146 [2022-11-26 00:00:28,032 INFO L226 Difference]: Without dead ends: 86 [2022-11-26 00:00:28,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 171 SyntacticMatches, 37 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2913 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1463, Invalid=5509, Unknown=0, NotChecked=0, Total=6972 [2022-11-26 00:00:28,033 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 186 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:28,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 169 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:00:28,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-26 00:00:28,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-26 00:00:28,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 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) [2022-11-26 00:00:28,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-26 00:00:28,057 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 78 [2022-11-26 00:00:28,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:28,057 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-26 00:00:28,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 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) [2022-11-26 00:00:28,057 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-26 00:00:28,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-26 00:00:28,058 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:28,058 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-11-26 00:00:28,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:28,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-26 00:00:28,264 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:28,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:28,264 INFO L85 PathProgramCache]: Analyzing trace with hash 528916002, now seen corresponding path program 32 times [2022-11-26 00:00:28,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:28,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857126657] [2022-11-26 00:00:28,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:28,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:28,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:30,270 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:30,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:30,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857126657] [2022-11-26 00:00:30,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857126657] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:30,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876921313] [2022-11-26 00:00:30,271 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:00:30,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:30,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:30,272 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:30,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-26 00:00:32,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-26 00:00:32,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:00:32,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-26 00:00:32,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:32,775 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 15 treesize of output 11 [2022-11-26 00:00:34,317 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 47 treesize of output 23 [2022-11-26 00:00:34,374 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:34,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:34,848 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 16 treesize of output 14 [2022-11-26 00:00:34,851 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 24 treesize of output 20 [2022-11-26 00:00:34,858 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 16 treesize of output 14 [2022-11-26 00:00:34,879 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 24 treesize of output 20 [2022-11-26 00:00:34,983 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:34,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876921313] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:34,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495416067] [2022-11-26 00:00:34,985 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:34,985 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:34,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:34,986 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:34,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:35,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:35,016 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:00:35,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:00:35,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:35,042 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:35,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:35,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:35,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:00:35,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:35,101 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:00:35,124 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:00:35,125 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:00:35,190 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 18 treesize of output 14 [2022-11-26 00:00:35,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:35,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16391#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:35,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:35,871 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:35,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 43] total 64 [2022-11-26 00:00:35,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851406747] [2022-11-26 00:00:35,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:35,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-26 00:00:35,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:35,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-26 00:00:35,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=4503, Unknown=0, NotChecked=0, Total=4692 [2022-11-26 00:00:35,873 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 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) [2022-11-26 00:00:38,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:38,361 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2022-11-26 00:00:38,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-26 00:00:38,361 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 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 79 [2022-11-26 00:00:38,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:38,361 INFO L225 Difference]: With dead ends: 87 [2022-11-26 00:00:38,362 INFO L226 Difference]: Without dead ends: 85 [2022-11-26 00:00:38,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 205 SyntacticMatches, 5 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1135 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=355, Invalid=8017, Unknown=0, NotChecked=0, Total=8372 [2022-11-26 00:00:38,363 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 35 mSDsluCounter, 838 mSDsCounter, 0 mSdLazyCounter, 3058 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 3080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 3058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:38,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 858 Invalid, 3080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 3058 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-26 00:00:38,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-26 00:00:38,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2022-11-26 00:00:38,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 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) [2022-11-26 00:00:38,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-11-26 00:00:38,398 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2022-11-26 00:00:38,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:38,399 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-11-26 00:00:38,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 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) [2022-11-26 00:00:38,399 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-11-26 00:00:38,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-26 00:00:38,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:38,399 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1] [2022-11-26 00:00:38,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:38,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-26 00:00:38,607 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:38,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:38,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1293599973, now seen corresponding path program 33 times [2022-11-26 00:00:38,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:38,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785324706] [2022-11-26 00:00:38,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:38,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:39,564 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:39,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:39,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785324706] [2022-11-26 00:00:39,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785324706] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:39,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697426417] [2022-11-26 00:00:39,566 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:00:39,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:39,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:39,568 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:39,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-26 00:00:40,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:00:40,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:00:40,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 00:00:40,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:41,283 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:41,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:41,981 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:41,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697426417] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:41,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [908044364] [2022-11-26 00:00:41,982 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:41,982 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:41,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:41,983 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:41,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:41,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:42,010 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:00:42,010 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:00:42,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:42,044 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:42,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:42,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:42,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:00:42,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:42,103 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:00:42,127 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:00:42,127 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:00:42,189 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 18 treesize of output 14 [2022-11-26 00:00:42,230 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:42,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17243#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:42,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:42,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:42,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2022-11-26 00:00:42,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701728741] [2022-11-26 00:00:42,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:42,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-26 00:00:42,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:42,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-26 00:00:42,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3729, Unknown=0, NotChecked=0, Total=4692 [2022-11-26 00:00:42,680 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 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) [2022-11-26 00:00:43,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:43,272 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-11-26 00:00:43,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-26 00:00:43,273 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 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 82 [2022-11-26 00:00:43,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:43,273 INFO L225 Difference]: With dead ends: 153 [2022-11-26 00:00:43,274 INFO L226 Difference]: Without dead ends: 90 [2022-11-26 00:00:43,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 180 SyntacticMatches, 39 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3197 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1609, Invalid=6047, Unknown=0, NotChecked=0, Total=7656 [2022-11-26 00:00:43,275 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 220 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:43,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 194 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:00:43,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-26 00:00:43,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-11-26 00:00:43,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 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) [2022-11-26 00:00:43,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-11-26 00:00:43,304 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 82 [2022-11-26 00:00:43,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:43,304 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-11-26 00:00:43,304 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 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) [2022-11-26 00:00:43,304 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-11-26 00:00:43,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-26 00:00:43,305 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:43,305 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-26 00:00:43,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:43,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:43,505 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:43,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:43,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1196579327, now seen corresponding path program 34 times [2022-11-26 00:00:43,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:43,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882707373] [2022-11-26 00:00:43,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:43,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:45,698 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:45,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:45,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882707373] [2022-11-26 00:00:45,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882707373] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:45,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658727652] [2022-11-26 00:00:45,699 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:00:45,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:45,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:45,700 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:45,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-26 00:00:45,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:45,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 134 conjunts are in the unsatisfiable core [2022-11-26 00:00:45,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:47,115 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 13 treesize of output 9 [2022-11-26 00:00:49,071 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:49,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:49,451 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 16 treesize of output 14 [2022-11-26 00:00:49,459 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 24 treesize of output 20 [2022-11-26 00:00:49,464 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 16 treesize of output 14 [2022-11-26 00:00:49,466 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 24 treesize of output 20 [2022-11-26 00:00:49,551 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:49,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658727652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:49,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170742339] [2022-11-26 00:00:49,552 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:49,552 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:49,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:49,553 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:49,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:49,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:49,579 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:49,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:49,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:49,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:00:49,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:49,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:00:49,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:49,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:49,653 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:00:49,653 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:00:49,696 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 18 treesize of output 14 [2022-11-26 00:00:49,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:00:50,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18206#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:00:50,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:00:50,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:00:50,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-11-26 00:00:50,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449960222] [2022-11-26 00:00:50,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:00:50,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-26 00:00:50,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:00:50,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-26 00:00:50,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=8098, Unknown=0, NotChecked=0, Total=8372 [2022-11-26 00:00:50,494 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 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) [2022-11-26 00:00:53,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:00:53,359 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2022-11-26 00:00:53,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-26 00:00:53,360 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 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 83 [2022-11-26 00:00:53,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:00:53,360 INFO L225 Difference]: With dead ends: 91 [2022-11-26 00:00:53,360 INFO L226 Difference]: Without dead ends: 89 [2022-11-26 00:00:53,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 198 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2409 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=458, Invalid=12652, Unknown=0, NotChecked=0, Total=13110 [2022-11-26 00:00:53,362 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 44 mSDsluCounter, 1296 mSDsCounter, 0 mSdLazyCounter, 4020 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 1318 SdHoareTripleChecker+Invalid, 4042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 4020 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-26 00:00:53,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 1318 Invalid, 4042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 4020 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-26 00:00:53,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-26 00:00:53,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2022-11-26 00:00:53,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 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) [2022-11-26 00:00:53,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-11-26 00:00:53,400 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2022-11-26 00:00:53,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:00:53,401 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-11-26 00:00:53,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 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) [2022-11-26 00:00:53,401 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-11-26 00:00:53,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-26 00:00:53,402 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:00:53,402 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1] [2022-11-26 00:00:53,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-26 00:00:53,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-26 00:00:53,608 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:00:53,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:00:53,609 INFO L85 PathProgramCache]: Analyzing trace with hash 938619612, now seen corresponding path program 35 times [2022-11-26 00:00:53,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:00:53,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371407064] [2022-11-26 00:00:53,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:00:53,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:00:53,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:00:54,679 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:54,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:00:54,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371407064] [2022-11-26 00:00:54,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371407064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:00:54,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158147097] [2022-11-26 00:00:54,679 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:00:54,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:00:54,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:00:54,680 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:00:54,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-26 00:00:57,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-26 00:00:57,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:00:57,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-26 00:00:57,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:00:58,331 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:58,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:00:59,077 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:00:59,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158147097] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:00:59,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110139603] [2022-11-26 00:00:59,078 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:00:59,078 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:00:59,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:00:59,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:00:59,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:00:59,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:59,105 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:00:59,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:00:59,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:59,128 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:00:59,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:00:59,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:59,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:00:59,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:59,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:00:59,203 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:00:59,204 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:00:59,255 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 18 treesize of output 14 [2022-11-26 00:00:59,310 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:01:00,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19097#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:01:00,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:01:00,822 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:01:00,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-11-26 00:01:00,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981521624] [2022-11-26 00:01:00,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:01:00,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-26 00:01:00,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:01:00,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-26 00:01:00,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=4060, Unknown=0, NotChecked=0, Total=5112 [2022-11-26 00:01:00,824 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 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) [2022-11-26 00:01:01,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:01:01,461 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2022-11-26 00:01:01,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-26 00:01:01,462 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 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 86 [2022-11-26 00:01:01,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:01:01,462 INFO L225 Difference]: With dead ends: 160 [2022-11-26 00:01:01,462 INFO L226 Difference]: Without dead ends: 94 [2022-11-26 00:01:01,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 168 SyntacticMatches, 62 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4878 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1762, Invalid=6610, Unknown=0, NotChecked=0, Total=8372 [2022-11-26 00:01:01,464 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 294 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:01:01,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 192 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:01:01,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-26 00:01:01,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-26 00:01:01,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 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) [2022-11-26 00:01:01,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-26 00:01:01,488 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2022-11-26 00:01:01,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:01:01,489 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-26 00:01:01,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 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) [2022-11-26 00:01:01,489 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-26 00:01:01,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-26 00:01:01,489 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:01:01,489 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-11-26 00:01:01,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-26 00:01:01,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-26 00:01:01,695 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:01:01,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:01:01,695 INFO L85 PathProgramCache]: Analyzing trace with hash -65094974, now seen corresponding path program 36 times [2022-11-26 00:01:01,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:01:01,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000580313] [2022-11-26 00:01:01,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:01:01,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:01:01,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:01:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:04,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:01:04,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000580313] [2022-11-26 00:01:04,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000580313] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:01:04,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833559765] [2022-11-26 00:01:04,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:01:04,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:01:04,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:01:04,513 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:01:04,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-26 00:01:05,550 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:01:05,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:01:05,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-26 00:01:05,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:01:06,685 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 13 treesize of output 9 [2022-11-26 00:01:08,861 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:08,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:01:11,022 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 16 treesize of output 14 [2022-11-26 00:01:11,026 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 24 treesize of output 20 [2022-11-26 00:01:11,058 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:11,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833559765] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:01:11,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178276350] [2022-11-26 00:01:11,060 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:01:11,060 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:01:11,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:01:11,060 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:01:11,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:01:11,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:11,090 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:01:11,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:01:11,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:11,115 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:01:11,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:01:11,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:11,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:01:11,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:11,171 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:01:11,206 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:01:11,206 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:01:11,274 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 18 treesize of output 14 [2022-11-26 00:01:11,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:01:12,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20128#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:01:12,182 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:01:12,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:01:12,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 113 [2022-11-26 00:01:12,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867698621] [2022-11-26 00:01:12,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:01:12,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-26 00:01:12,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:01:12,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-26 00:01:12,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=13467, Unknown=0, NotChecked=0, Total=13806 [2022-11-26 00:01:12,186 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 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) [2022-11-26 00:01:19,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:01:19,982 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2022-11-26 00:01:19,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-26 00:01:19,983 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 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 87 [2022-11-26 00:01:19,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:01:19,983 INFO L225 Difference]: With dead ends: 95 [2022-11-26 00:01:19,983 INFO L226 Difference]: Without dead ends: 93 [2022-11-26 00:01:19,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3711 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=742, Invalid=25990, Unknown=0, NotChecked=0, Total=26732 [2022-11-26 00:01:19,985 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 103 mSDsluCounter, 1528 mSDsCounter, 0 mSdLazyCounter, 5384 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 1550 SdHoareTripleChecker+Invalid, 5408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 5384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:01:19,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 1550 Invalid, 5408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 5384 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-26 00:01:19,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-26 00:01:20,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2022-11-26 00:01:20,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 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) [2022-11-26 00:01:20,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-11-26 00:01:20,015 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2022-11-26 00:01:20,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:01:20,015 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-11-26 00:01:20,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 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) [2022-11-26 00:01:20,016 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-11-26 00:01:20,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-26 00:01:20,016 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:01:20,016 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1] [2022-11-26 00:01:20,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-26 00:01:20,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-26 00:01:20,225 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:01:20,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:01:20,225 INFO L85 PathProgramCache]: Analyzing trace with hash 2085640827, now seen corresponding path program 37 times [2022-11-26 00:01:20,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:01:20,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324497849] [2022-11-26 00:01:20,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:01:20,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:01:20,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:01:21,455 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:21,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:01:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324497849] [2022-11-26 00:01:21,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324497849] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:01:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745579709] [2022-11-26 00:01:21,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:01:21,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:01:21,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:01:21,457 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:01:21,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-26 00:01:21,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:01:21,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 00:01:21,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:01:22,742 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:22,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:01:23,587 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:23,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745579709] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:01:23,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [5041233] [2022-11-26 00:01:23,589 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:01:23,589 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:01:23,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:01:23,589 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:01:23,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:01:23,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:23,618 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:01:23,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:01:23,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:23,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:01:23,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:23,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:01:23,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:23,688 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:01:23,713 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:01:23,714 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:01:23,776 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 18 treesize of output 14 [2022-11-26 00:01:23,827 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:01:24,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21104#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:01:24,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:01:24,301 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:01:24,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 70 [2022-11-26 00:01:24,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571819941] [2022-11-26 00:01:24,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:01:24,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-26 00:01:24,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:01:24,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-26 00:01:24,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1145, Invalid=4405, Unknown=0, NotChecked=0, Total=5550 [2022-11-26 00:01:24,303 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 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) [2022-11-26 00:01:25,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:01:25,001 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2022-11-26 00:01:25,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-26 00:01:25,002 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 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 90 [2022-11-26 00:01:25,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:01:25,002 INFO L225 Difference]: With dead ends: 167 [2022-11-26 00:01:25,003 INFO L226 Difference]: Without dead ends: 98 [2022-11-26 00:01:25,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 198 SyntacticMatches, 43 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3804 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1922, Invalid=7198, Unknown=0, NotChecked=0, Total=9120 [2022-11-26 00:01:25,004 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 222 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:01:25,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 243 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:01:25,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-26 00:01:25,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2022-11-26 00:01:25,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 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) [2022-11-26 00:01:25,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-11-26 00:01:25,037 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 90 [2022-11-26 00:01:25,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:01:25,037 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-11-26 00:01:25,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 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) [2022-11-26 00:01:25,037 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-11-26 00:01:25,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-26 00:01:25,038 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:01:25,038 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-26 00:01:25,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-26 00:01:25,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:01:25,244 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:01:25,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:01:25,245 INFO L85 PathProgramCache]: Analyzing trace with hash -980779167, now seen corresponding path program 38 times [2022-11-26 00:01:25,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:01:25,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070707580] [2022-11-26 00:01:25,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:01:25,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:01:25,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:01:27,772 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:27,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:01:27,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070707580] [2022-11-26 00:01:27,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070707580] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:01:27,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808901371] [2022-11-26 00:01:27,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:01:27,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:01:27,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:01:27,774 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:01:27,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-26 00:01:32,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-26 00:01:32,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:01:32,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 125 conjunts are in the unsatisfiable core [2022-11-26 00:01:32,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:01:34,163 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 13 treesize of output 9 [2022-11-26 00:01:36,534 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-26 00:01:36,534 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 42 treesize of output 23 [2022-11-26 00:01:36,608 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 651 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:36,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:01:40,389 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 18 treesize of output 16 [2022-11-26 00:01:40,392 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 30 treesize of output 24 [2022-11-26 00:01:43,116 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 630 proven. 295 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:01:43,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808901371] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:01:43,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1417981582] [2022-11-26 00:01:43,117 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:01:43,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:01:43,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:01:43,118 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:01:43,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:01:43,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:43,149 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:01:43,150 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:01:43,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:43,177 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:01:43,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:01:43,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:43,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:01:43,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:43,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:01:43,255 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:01:43,255 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:01:43,297 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 18 treesize of output 14 [2022-11-26 00:01:43,338 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:01:46,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22203#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:01:46,962 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:01:46,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:01:46,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 139 [2022-11-26 00:01:46,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702253792] [2022-11-26 00:01:46,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:01:46,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-26 00:01:46,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:01:46,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-26 00:01:46,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1588, Invalid=19004, Unknown=0, NotChecked=0, Total=20592 [2022-11-26 00:01:46,965 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 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) [2022-11-26 00:01:57,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:01:57,797 INFO L93 Difference]: Finished difference Result 167 states and 170 transitions. [2022-11-26 00:01:57,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-11-26 00:01:57,798 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 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 91 [2022-11-26 00:01:57,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:01:57,798 INFO L225 Difference]: With dead ends: 167 [2022-11-26 00:01:57,798 INFO L226 Difference]: Without dead ends: 98 [2022-11-26 00:01:57,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 155 SyntacticMatches, 22 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17446 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=4238, Invalid=54568, Unknown=0, NotChecked=0, Total=58806 [2022-11-26 00:01:57,804 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 287 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 4488 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 1398 SdHoareTripleChecker+Invalid, 4621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 4488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:01:57,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 1398 Invalid, 4621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 4488 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-26 00:01:57,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-26 00:01:57,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2022-11-26 00:01:57,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 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) [2022-11-26 00:01:57,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-11-26 00:01:57,845 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 91 [2022-11-26 00:01:57,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:01:57,845 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-11-26 00:01:57,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 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) [2022-11-26 00:01:57,846 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-11-26 00:01:57,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-26 00:01:57,846 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:01:57,846 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-26 00:01:57,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-26 00:01:58,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-26 00:01:58,048 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:01:58,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:01:58,049 INFO L85 PathProgramCache]: Analyzing trace with hash 882351970, now seen corresponding path program 39 times [2022-11-26 00:01:58,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:01:58,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202103820] [2022-11-26 00:01:58,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:01:58,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:01:58,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:02:00,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:00,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:02:00,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202103820] [2022-11-26 00:02:00,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202103820] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:02:00,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385455686] [2022-11-26 00:02:00,768 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:02:00,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:00,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:02:00,770 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:02:00,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-26 00:02:01,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:02:01,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:02:01,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 111 conjunts are in the unsatisfiable core [2022-11-26 00:02:01,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:02:03,068 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 13 treesize of output 9 [2022-11-26 00:02:05,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:05,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:02:06,223 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 16 treesize of output 14 [2022-11-26 00:02:06,225 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 24 treesize of output 20 [2022-11-26 00:02:06,229 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 16 treesize of output 14 [2022-11-26 00:02:06,232 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 24 treesize of output 20 [2022-11-26 00:02:06,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:06,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385455686] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:02:06,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043955876] [2022-11-26 00:02:06,322 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:02:06,323 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:02:06,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:02:06,323 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:02:06,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:02:06,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:06,347 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:02:06,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:02:06,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:06,371 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:02:06,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:02:06,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:06,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:02:06,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:06,424 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:02:06,447 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:02:06,448 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:02:06,509 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 18 treesize of output 14 [2022-11-26 00:02:06,554 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:02:07,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23452#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:02:07,405 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:02:07,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:02:07,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 51] total 101 [2022-11-26 00:02:07,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715543636] [2022-11-26 00:02:07,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:02:07,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-26 00:02:07,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:02:07,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-26 00:02:07,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=10806, Unknown=0, NotChecked=0, Total=11130 [2022-11-26 00:02:07,408 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 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) [2022-11-26 00:02:11,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:02:11,119 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2022-11-26 00:02:11,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-26 00:02:11,120 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 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 95 [2022-11-26 00:02:11,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:02:11,121 INFO L225 Difference]: With dead ends: 103 [2022-11-26 00:02:11,121 INFO L226 Difference]: Without dead ends: 101 [2022-11-26 00:02:11,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 226 SyntacticMatches, 3 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3394 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=555, Invalid=17267, Unknown=0, NotChecked=0, Total=17822 [2022-11-26 00:02:11,123 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 52 mSDsluCounter, 1514 mSDsCounter, 0 mSdLazyCounter, 5013 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 1538 SdHoareTripleChecker+Invalid, 5040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 5013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:02:11,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 1538 Invalid, 5040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 5013 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-26 00:02:11,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-26 00:02:11,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2022-11-26 00:02:11,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 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) [2022-11-26 00:02:11,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-11-26 00:02:11,173 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2022-11-26 00:02:11,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:02:11,173 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-11-26 00:02:11,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 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) [2022-11-26 00:02:11,173 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-11-26 00:02:11,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-26 00:02:11,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:02:11,174 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1] [2022-11-26 00:02:11,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-26 00:02:11,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:11,383 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:02:11,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:02:11,383 INFO L85 PathProgramCache]: Analyzing trace with hash 952480219, now seen corresponding path program 40 times [2022-11-26 00:02:11,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:02:11,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710941956] [2022-11-26 00:02:11,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:02:11,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:02:11,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:02:12,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:12,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:02:12,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710941956] [2022-11-26 00:02:12,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710941956] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:02:12,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250129807] [2022-11-26 00:02:12,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:02:12,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:12,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:02:12,721 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:02:12,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-26 00:02:12,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:02:12,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-26 00:02:12,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:02:14,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:14,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:02:15,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:15,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250129807] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:02:15,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2002189932] [2022-11-26 00:02:15,271 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:02:15,271 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:02:15,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:02:15,271 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:02:15,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:02:15,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:15,300 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:02:15,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:02:15,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:15,329 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:02:15,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:02:15,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:15,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:02:15,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:15,402 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:02:15,424 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:02:15,425 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:02:15,489 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 18 treesize of output 14 [2022-11-26 00:02:15,526 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:02:16,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24470#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:02:16,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:02:16,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:02:16,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 76 [2022-11-26 00:02:16,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686639033] [2022-11-26 00:02:16,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:02:16,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-26 00:02:16,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:02:16,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-26 00:02:16,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1343, Invalid=5137, Unknown=0, NotChecked=0, Total=6480 [2022-11-26 00:02:16,022 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 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) [2022-11-26 00:02:16,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:02:16,783 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2022-11-26 00:02:16,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-26 00:02:16,784 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 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 98 [2022-11-26 00:02:16,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:02:16,785 INFO L225 Difference]: With dead ends: 181 [2022-11-26 00:02:16,785 INFO L226 Difference]: Without dead ends: 106 [2022-11-26 00:02:16,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 216 SyntacticMatches, 47 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4463 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2263, Invalid=8449, Unknown=0, NotChecked=0, Total=10712 [2022-11-26 00:02:16,786 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 284 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:02:16,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 237 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:02:16,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-26 00:02:16,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2022-11-26 00:02:16,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:02:16,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-11-26 00:02:16,834 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2022-11-26 00:02:16,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:02:16,834 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-11-26 00:02:16,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 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) [2022-11-26 00:02:16,835 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-11-26 00:02:16,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-26 00:02:16,835 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:02:16,836 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-26 00:02:16,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-26 00:02:17,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:17,042 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:02:17,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:02:17,042 INFO L85 PathProgramCache]: Analyzing trace with hash 2098696385, now seen corresponding path program 41 times [2022-11-26 00:02:17,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:02:17,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035725911] [2022-11-26 00:02:17,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:02:17,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:02:17,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:02:19,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:19,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:02:19,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035725911] [2022-11-26 00:02:19,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035725911] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:02:19,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151957738] [2022-11-26 00:02:19,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:02:19,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:19,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:02:19,984 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:02:19,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-26 00:02:25,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-26 00:02:25,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:02:25,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 111 conjunts are in the unsatisfiable core [2022-11-26 00:02:25,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:02:26,895 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 13 treesize of output 9 [2022-11-26 00:02:29,674 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-26 00:02:29,675 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 42 treesize of output 23 [2022-11-26 00:02:29,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 782 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:29,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:02:34,056 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 18 treesize of output 16 [2022-11-26 00:02:34,059 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 30 treesize of output 24 [2022-11-26 00:02:37,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 759 proven. 346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:37,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151957738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:02:37,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574426701] [2022-11-26 00:02:37,395 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:02:37,395 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:02:37,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:02:37,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:02:37,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:02:37,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:37,423 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:02:37,424 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:02:37,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:37,462 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:02:37,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:02:37,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:37,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:02:37,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:02:37,524 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:02:37,550 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:02:37,550 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:02:37,593 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 18 treesize of output 14 [2022-11-26 00:02:37,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:02:38,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25665#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:02:38,598 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:02:38,598 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:02:38,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 151 [2022-11-26 00:02:38,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762178592] [2022-11-26 00:02:38,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:02:38,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-11-26 00:02:38,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:02:38,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-11-26 00:02:38,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1849, Invalid=22331, Unknown=0, NotChecked=0, Total=24180 [2022-11-26 00:02:38,602 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 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) [2022-11-26 00:02:50,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:02:50,954 INFO L93 Difference]: Finished difference Result 181 states and 184 transitions. [2022-11-26 00:02:50,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-11-26 00:02:50,954 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 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 99 [2022-11-26 00:02:50,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:02:50,955 INFO L225 Difference]: With dead ends: 181 [2022-11-26 00:02:50,955 INFO L226 Difference]: Without dead ends: 106 [2022-11-26 00:02:50,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17580 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=4920, Invalid=64512, Unknown=0, NotChecked=0, Total=69432 [2022-11-26 00:02:50,960 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 362 mSDsluCounter, 1491 mSDsCounter, 0 mSdLazyCounter, 4853 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 1517 SdHoareTripleChecker+Invalid, 5028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 4853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-26 00:02:50,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 1517 Invalid, 5028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 4853 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-26 00:02:50,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-26 00:02:50,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2022-11-26 00:02:50,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 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) [2022-11-26 00:02:50,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-11-26 00:02:50,994 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 99 [2022-11-26 00:02:50,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:02:50,995 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-11-26 00:02:50,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 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) [2022-11-26 00:02:50,995 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-11-26 00:02:50,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-26 00:02:50,996 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:02:50,996 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-11-26 00:02:51,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-26 00:02:51,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:51,206 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:02:51,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:02:51,206 INFO L85 PathProgramCache]: Analyzing trace with hash 310070274, now seen corresponding path program 42 times [2022-11-26 00:02:51,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:02:51,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704765823] [2022-11-26 00:02:51,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:02:51,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:02:51,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:02:54,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:02:54,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:02:54,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704765823] [2022-11-26 00:02:54,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704765823] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:02:54,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705362372] [2022-11-26 00:02:54,230 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:02:54,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:02:54,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:02:54,231 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:02:54,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-26 00:02:57,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:02:57,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:02:57,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 117 conjunts are in the unsatisfiable core [2022-11-26 00:02:57,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:02:57,876 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 15 treesize of output 11 [2022-11-26 00:03:00,332 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 47 treesize of output 23 [2022-11-26 00:03:00,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:00,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:03:00,969 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 16 treesize of output 14 [2022-11-26 00:03:00,971 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 24 treesize of output 20 [2022-11-26 00:03:00,977 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 16 treesize of output 14 [2022-11-26 00:03:00,979 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 24 treesize of output 20 [2022-11-26 00:03:01,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:01,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705362372] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:03:01,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1248429282] [2022-11-26 00:03:01,077 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:03:01,077 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:03:01,078 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:03:01,078 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:03:01,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:03:01,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:01,104 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:03:01,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:03:01,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:01,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:03:01,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:01,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:03:01,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:01,165 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:03:01,188 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:03:01,189 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:03:01,250 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 18 treesize of output 14 [2022-11-26 00:03:01,291 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:03:02,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26993#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:03:02,066 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:03:02,066 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:03:02,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 55, 55] total 82 [2022-11-26 00:03:02,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441227356] [2022-11-26 00:03:02,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:03:02,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-11-26 00:03:02,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:03:02,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-11-26 00:03:02,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=7245, Unknown=0, NotChecked=0, Total=7482 [2022-11-26 00:03:02,069 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 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) [2022-11-26 00:03:06,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:03:06,256 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2022-11-26 00:03:06,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-26 00:03:06,257 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 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 103 [2022-11-26 00:03:06,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:03:06,257 INFO L225 Difference]: With dead ends: 111 [2022-11-26 00:03:06,257 INFO L226 Difference]: Without dead ends: 109 [2022-11-26 00:03:06,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 271 SyntacticMatches, 5 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=453, Invalid=13119, Unknown=0, NotChecked=0, Total=13572 [2022-11-26 00:03:06,258 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 38 mSDsluCounter, 1617 mSDsCounter, 0 mSdLazyCounter, 5441 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 1643 SdHoareTripleChecker+Invalid, 5468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 5441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-26 00:03:06,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 1643 Invalid, 5468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 5441 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-26 00:03:06,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-26 00:03:06,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2022-11-26 00:03:06,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 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) [2022-11-26 00:03:06,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2022-11-26 00:03:06,294 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 103 [2022-11-26 00:03:06,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:03:06,294 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2022-11-26 00:03:06,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 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) [2022-11-26 00:03:06,294 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2022-11-26 00:03:06,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-26 00:03:06,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:03:06,295 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1] [2022-11-26 00:03:06,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-26 00:03:06,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-26 00:03:06,495 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:03:06,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:03:06,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1166327493, now seen corresponding path program 43 times [2022-11-26 00:03:06,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:03:06,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138380794] [2022-11-26 00:03:06,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:03:06,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:03:06,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:03:07,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:07,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:03:07,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138380794] [2022-11-26 00:03:07,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138380794] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:03:07,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751564455] [2022-11-26 00:03:07,901 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:03:07,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:03:07,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:03:07,902 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:03:07,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-26 00:03:08,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:03:08,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-26 00:03:08,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:03:09,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:09,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:03:10,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:10,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751564455] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:03:10,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187963271] [2022-11-26 00:03:10,653 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:03:10,654 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:03:10,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:03:10,654 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:03:10,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:03:10,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:10,681 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:03:10,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:03:10,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:10,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:03:10,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:10,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:03:10,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:10,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:10,761 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:03:10,762 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:03:10,806 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 18 treesize of output 14 [2022-11-26 00:03:10,847 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:03:12,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28093#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:03:12,888 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:03:12,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:03:12,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 82 [2022-11-26 00:03:12,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021010145] [2022-11-26 00:03:12,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:03:12,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-11-26 00:03:12,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:03:12,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-11-26 00:03:12,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=5925, Unknown=0, NotChecked=0, Total=7482 [2022-11-26 00:03:12,890 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 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) [2022-11-26 00:03:13,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:03:13,712 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2022-11-26 00:03:13,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-26 00:03:13,712 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 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 106 [2022-11-26 00:03:13,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:03:13,713 INFO L225 Difference]: With dead ends: 195 [2022-11-26 00:03:13,713 INFO L226 Difference]: Without dead ends: 114 [2022-11-26 00:03:13,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 208 SyntacticMatches, 77 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7278 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2632, Invalid=9800, Unknown=0, NotChecked=0, Total=12432 [2022-11-26 00:03:13,715 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 282 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:03:13,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [282 Valid, 239 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:03:13,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-26 00:03:13,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2022-11-26 00:03:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 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) [2022-11-26 00:03:13,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2022-11-26 00:03:13,764 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 106 [2022-11-26 00:03:13,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:03:13,765 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2022-11-26 00:03:13,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 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) [2022-11-26 00:03:13,765 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2022-11-26 00:03:13,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-26 00:03:13,766 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:03:13,766 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-26 00:03:13,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-26 00:03:13,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-26 00:03:13,972 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:03:13,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:03:13,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1416963551, now seen corresponding path program 44 times [2022-11-26 00:03:13,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:03:13,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694114827] [2022-11-26 00:03:13,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:03:13,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:03:14,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:03:17,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:17,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:03:17,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694114827] [2022-11-26 00:03:17,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694114827] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:03:17,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576407088] [2022-11-26 00:03:17,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:03:17,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:03:17,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:03:17,139 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:03:17,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-26 00:03:25,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-26 00:03:25,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:03:25,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-26 00:03:25,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:03:27,805 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 13 treesize of output 9 [2022-11-26 00:03:30,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:30,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:03:34,452 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 16 treesize of output 14 [2022-11-26 00:03:34,454 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 24 treesize of output 20 [2022-11-26 00:03:37,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:03:37,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576407088] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:03:37,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1122117598] [2022-11-26 00:03:37,456 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:03:37,457 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:03:37,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:03:37,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:03:37,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:03:37,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:37,481 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:03:37,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:03:37,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:37,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:03:37,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:37,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:03:37,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:03:37,540 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:03:37,562 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:03:37,563 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:03:37,614 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 18 treesize of output 14 [2022-11-26 00:03:37,659 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:03:38,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29384#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:03:38,834 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:03:38,834 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:03:38,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 163 [2022-11-26 00:03:38,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312108419] [2022-11-26 00:03:38,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:03:38,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-26 00:03:38,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:03:38,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-26 00:03:38,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1609, Invalid=26447, Unknown=0, NotChecked=0, Total=28056 [2022-11-26 00:03:38,838 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 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) [2022-11-26 00:04:11,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:04:11,606 INFO L93 Difference]: Finished difference Result 270 states and 298 transitions. [2022-11-26 00:04:11,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 187 states. [2022-11-26 00:04:11,607 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 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 107 [2022-11-26 00:04:11,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:04:11,608 INFO L225 Difference]: With dead ends: 270 [2022-11-26 00:04:11,608 INFO L226 Difference]: Without dead ends: 268 [2022-11-26 00:04:11,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22267 ImplicationChecksByTransitivity, 41.5s TimeCoverageRelationStatistics Valid=5609, Invalid=83493, Unknown=0, NotChecked=0, Total=89102 [2022-11-26 00:04:11,614 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 506 mSDsluCounter, 2532 mSDsCounter, 0 mSdLazyCounter, 7960 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 2560 SdHoareTripleChecker+Invalid, 8252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 7960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:04:11,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [506 Valid, 2560 Invalid, 8252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 7960 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-26 00:04:11,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-26 00:04:11,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 190. [2022-11-26 00:04:11,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 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) [2022-11-26 00:04:11,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2022-11-26 00:04:11,727 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 107 [2022-11-26 00:04:11,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:04:11,727 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2022-11-26 00:04:11,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 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) [2022-11-26 00:04:11,728 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2022-11-26 00:04:11,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-26 00:04:11,728 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:04:11,728 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-11-26 00:04:11,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-26 00:04:11,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:04:11,939 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:04:11,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:04:11,939 INFO L85 PathProgramCache]: Analyzing trace with hash -808206174, now seen corresponding path program 45 times [2022-11-26 00:04:11,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:04:11,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662331469] [2022-11-26 00:04:11,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:04:11,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:04:12,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:04:15,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:15,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:04:15,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662331469] [2022-11-26 00:04:15,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662331469] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:04:15,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235967012] [2022-11-26 00:04:15,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:04:15,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:04:15,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:04:15,021 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:04:15,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-26 00:04:16,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:04:16,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:04:16,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 125 conjunts are in the unsatisfiable core [2022-11-26 00:04:16,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:04:16,239 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 15 treesize of output 11 [2022-11-26 00:04:19,075 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 47 treesize of output 23 [2022-11-26 00:04:19,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:19,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:04:19,768 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 16 treesize of output 14 [2022-11-26 00:04:19,770 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 24 treesize of output 20 [2022-11-26 00:04:19,776 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 16 treesize of output 14 [2022-11-26 00:04:19,778 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 24 treesize of output 20 [2022-11-26 00:04:19,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:19,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235967012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:04:19,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [173377422] [2022-11-26 00:04:19,882 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:04:19,882 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:04:19,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:04:19,883 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:04:19,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:04:19,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:19,905 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:04:19,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:04:19,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:19,931 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:04:19,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:04:19,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:19,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:04:19,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:19,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:20,002 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:04:20,002 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:04:20,048 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 18 treesize of output 14 [2022-11-26 00:04:20,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:04:23,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31048#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:04:23,834 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:04:23,835 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:04:23,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 59, 59] total 88 [2022-11-26 00:04:23,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327341745] [2022-11-26 00:04:23,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:04:23,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-26 00:04:23,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:04:23,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-26 00:04:23,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=8303, Unknown=0, NotChecked=0, Total=8556 [2022-11-26 00:04:23,840 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 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) [2022-11-26 00:04:28,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:04:28,768 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2022-11-26 00:04:28,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-26 00:04:28,769 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 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 111 [2022-11-26 00:04:28,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:04:28,770 INFO L225 Difference]: With dead ends: 279 [2022-11-26 00:04:28,770 INFO L226 Difference]: Without dead ends: 277 [2022-11-26 00:04:28,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 266 SyntacticMatches, 32 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3215 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=501, Invalid=15755, Unknown=0, NotChecked=0, Total=16256 [2022-11-26 00:04:28,771 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 53 mSDsluCounter, 1984 mSDsCounter, 0 mSdLazyCounter, 5881 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 2018 SdHoareTripleChecker+Invalid, 5913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 5881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:04:28,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 2018 Invalid, 5913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 5881 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-26 00:04:28,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2022-11-26 00:04:28,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 190. [2022-11-26 00:04:28,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 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) [2022-11-26 00:04:28,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2022-11-26 00:04:28,882 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 111 [2022-11-26 00:04:28,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:04:28,882 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2022-11-26 00:04:28,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 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) [2022-11-26 00:04:28,883 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2022-11-26 00:04:28,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-26 00:04:28,883 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:04:28,884 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1, 1] [2022-11-26 00:04:28,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-26 00:04:29,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-26 00:04:29,091 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:04:29,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:04:29,091 INFO L85 PathProgramCache]: Analyzing trace with hash 321325211, now seen corresponding path program 46 times [2022-11-26 00:04:29,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:04:29,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923602499] [2022-11-26 00:04:29,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:04:29,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:04:29,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:04:30,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1028 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:30,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:04:30,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923602499] [2022-11-26 00:04:30,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923602499] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:04:30,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169996593] [2022-11-26 00:04:30,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:04:30,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:04:30,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:04:30,726 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:04:30,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-26 00:04:30,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:04:30,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-26 00:04:30,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:04:32,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:32,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:04:33,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:33,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169996593] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:04:33,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393722211] [2022-11-26 00:04:33,848 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:04:33,849 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:04:33,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:04:33,849 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:04:33,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:04:33,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:33,874 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:04:33,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:04:33,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:33,883 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:04:33,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:33,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:04:33,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:33,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:04:33,948 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:04:33,949 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:04:33,990 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 18 treesize of output 14 [2022-11-26 00:04:34,030 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:04:36,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32549#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:04:36,318 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:04:36,318 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:04:36,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 88 [2022-11-26 00:04:36,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524005795] [2022-11-26 00:04:36,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:04:36,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-26 00:04:36,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:04:36,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-26 00:04:36,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1787, Invalid=6769, Unknown=0, NotChecked=0, Total=8556 [2022-11-26 00:04:36,320 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 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) [2022-11-26 00:04:38,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:04:38,165 INFO L93 Difference]: Finished difference Result 364 states and 367 transitions. [2022-11-26 00:04:38,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-26 00:04:38,166 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 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 114 [2022-11-26 00:04:38,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:04:38,167 INFO L225 Difference]: With dead ends: 364 [2022-11-26 00:04:38,167 INFO L226 Difference]: Without dead ends: 122 [2022-11-26 00:04:38,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 224 SyntacticMatches, 83 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10232 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4299, Invalid=17163, Unknown=0, NotChecked=0, Total=21462 [2022-11-26 00:04:38,170 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 450 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:04:38,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [450 Valid, 347 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:04:38,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-26 00:04:38,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 116. [2022-11-26 00:04:38,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.017391304347826) internal successors, (117), 115 states have internal predecessors, (117), 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) [2022-11-26 00:04:38,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2022-11-26 00:04:38,245 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 114 [2022-11-26 00:04:38,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:04:38,245 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2022-11-26 00:04:38,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 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) [2022-11-26 00:04:38,246 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2022-11-26 00:04:38,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-26 00:04:38,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:04:38,246 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-26 00:04:38,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-26 00:04:38,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-26 00:04:38,447 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:04:38,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:04:38,447 INFO L85 PathProgramCache]: Analyzing trace with hash 1553619841, now seen corresponding path program 47 times [2022-11-26 00:04:38,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:04:38,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493474109] [2022-11-26 00:04:38,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:04:38,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:04:38,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:04:41,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:04:41,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:04:41,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493474109] [2022-11-26 00:04:41,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493474109] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:04:41,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367105190] [2022-11-26 00:04:41,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:04:41,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:04:41,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:04:41,797 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:04:41,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-26 00:05:01,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-11-26 00:05:01,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:05:01,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-26 00:05:01,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:05:01,545 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 18 treesize of output 14 [2022-11-26 00:05:01,637 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 33 treesize of output 32 [2022-11-26 00:05:01,752 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:05:01,752 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 1 case distinctions, treesize of input 44 treesize of output 46 [2022-11-26 00:05:07,218 INFO L321 Elim1Store]: treesize reduction 28, result has 9.7 percent of original size [2022-11-26 00:05:07,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 68 treesize of output 33 [2022-11-26 00:05:07,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:07,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:05:08,069 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 36 treesize of output 34 [2022-11-26 00:05:08,072 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 266 treesize of output 258 [2022-11-26 00:05:08,105 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 36 treesize of output 34 [2022-11-26 00:05:08,108 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 266 treesize of output 258 [2022-11-26 00:05:11,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 3 proven. 1510 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:11,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367105190] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:05:11,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520905948] [2022-11-26 00:05:11,173 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:05:11,173 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:05:11,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:05:11,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:05:11,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:05:11,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:11,198 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:05:11,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:05:11,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:11,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:05:11,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:11,223 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:05:11,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:11,260 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:05:11,285 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:05:11,285 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:05:11,325 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 18 treesize of output 14 [2022-11-26 00:05:11,369 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:05:12,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34143#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:05:12,399 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:05:12,399 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:05:12,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 121 [2022-11-26 00:05:12,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745151504] [2022-11-26 00:05:12,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:05:12,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-26 00:05:12,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:05:12,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-26 00:05:12,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=15199, Unknown=0, NotChecked=0, Total=15750 [2022-11-26 00:05:12,402 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 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) [2022-11-26 00:05:18,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:05:18,722 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2022-11-26 00:05:18,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-11-26 00:05:18,722 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 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 115 [2022-11-26 00:05:18,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:05:18,723 INFO L225 Difference]: With dead ends: 123 [2022-11-26 00:05:18,723 INFO L226 Difference]: Without dead ends: 121 [2022-11-26 00:05:18,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 277 SyntacticMatches, 2 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3695 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=920, Invalid=23572, Unknown=0, NotChecked=0, Total=24492 [2022-11-26 00:05:18,726 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 58 mSDsluCounter, 1657 mSDsCounter, 0 mSdLazyCounter, 5710 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 1685 SdHoareTripleChecker+Invalid, 5739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 5710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:05:18,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 1685 Invalid, 5739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 5710 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-26 00:05:18,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-26 00:05:18,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2022-11-26 00:05:18,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 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) [2022-11-26 00:05:18,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2022-11-26 00:05:18,846 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 115 [2022-11-26 00:05:18,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:05:18,847 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2022-11-26 00:05:18,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 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) [2022-11-26 00:05:18,847 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2022-11-26 00:05:18,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-26 00:05:18,848 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:05:18,848 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1] [2022-11-26 00:05:18,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-11-26 00:05:19,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-26 00:05:19,060 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:05:19,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:05:19,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1325895004, now seen corresponding path program 48 times [2022-11-26 00:05:19,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:05:19,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283393485] [2022-11-26 00:05:19,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:05:19,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:05:19,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:05:20,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:20,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:05:20,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283393485] [2022-11-26 00:05:20,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283393485] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:05:20,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887184414] [2022-11-26 00:05:20,770 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:05:20,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:05:20,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:05:20,771 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:05:20,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-26 00:05:22,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:05:22,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:05:22,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-26 00:05:22,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:05:24,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:24,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:05:25,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:25,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887184414] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:05:25,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282457167] [2022-11-26 00:05:25,516 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:05:25,516 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:05:25,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:05:25,517 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:05:25,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:05:25,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:25,546 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:05:25,547 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:05:25,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:25,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:05:25,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:25,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:05:25,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:25,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:25,660 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:05:25,660 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:05:25,700 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 18 treesize of output 14 [2022-11-26 00:05:25,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:05:28,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35362#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:05:28,145 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:05:28,145 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:05:28,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-11-26 00:05:28,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502461959] [2022-11-26 00:05:28,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:05:28,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-26 00:05:28,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:05:28,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-26 00:05:28,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1908, Invalid=7212, Unknown=0, NotChecked=0, Total=9120 [2022-11-26 00:05:28,147 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 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) [2022-11-26 00:05:29,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:05:29,221 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2022-11-26 00:05:29,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-26 00:05:29,221 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 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 118 [2022-11-26 00:05:29,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:05:29,222 INFO L225 Difference]: With dead ends: 216 [2022-11-26 00:05:29,222 INFO L226 Difference]: Without dead ends: 126 [2022-11-26 00:05:29,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 232 SyntacticMatches, 86 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8946 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=3238, Invalid=12014, Unknown=0, NotChecked=0, Total=15252 [2022-11-26 00:05:29,224 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 484 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 484 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:05:29,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [484 Valid, 209 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:05:29,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-26 00:05:29,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 120. [2022-11-26 00:05:29,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 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) [2022-11-26 00:05:29,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-11-26 00:05:29,346 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 118 [2022-11-26 00:05:29,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:05:29,346 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-11-26 00:05:29,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 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) [2022-11-26 00:05:29,347 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-11-26 00:05:29,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-26 00:05:29,347 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:05:29,347 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-26 00:05:29,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-26 00:05:29,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-26 00:05:29,563 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:05:29,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:05:29,563 INFO L85 PathProgramCache]: Analyzing trace with hash 925564226, now seen corresponding path program 49 times [2022-11-26 00:05:29,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:05:29,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033005567] [2022-11-26 00:05:29,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:05:29,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:05:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:05:33,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:33,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:05:33,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033005567] [2022-11-26 00:05:33,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033005567] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:05:33,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018782681] [2022-11-26 00:05:33,037 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:05:33,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:05:33,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:05:33,038 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:05:33,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-26 00:05:33,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:05:33,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 130 conjunts are in the unsatisfiable core [2022-11-26 00:05:33,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:05:35,591 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 13 treesize of output 9 [2022-11-26 00:05:39,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:39,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:05:39,919 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 16 treesize of output 14 [2022-11-26 00:05:39,921 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 24 treesize of output 20 [2022-11-26 00:05:39,926 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 16 treesize of output 14 [2022-11-26 00:05:39,928 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 24 treesize of output 20 [2022-11-26 00:05:40,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:40,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018782681] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:05:40,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1782946261] [2022-11-26 00:05:40,042 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:05:40,042 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:05:40,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:05:40,043 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:05:40,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:05:40,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:40,069 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:05:40,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:05:40,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:40,078 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:05:40,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:40,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:05:40,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:40,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:05:40,147 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:05:40,148 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:05:40,189 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 18 treesize of output 14 [2022-11-26 00:05:40,242 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:05:45,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36739#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:05:45,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:05:45,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:05:45,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2022-11-26 00:05:45,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184383841] [2022-11-26 00:05:45,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:05:45,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-26 00:05:45,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:05:45,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-26 00:05:45,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=15874, Unknown=0, NotChecked=0, Total=16256 [2022-11-26 00:05:45,124 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 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) [2022-11-26 00:05:50,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:05:50,884 INFO L93 Difference]: Finished difference Result 127 states and 128 transitions. [2022-11-26 00:05:50,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-26 00:05:50,885 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 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 119 [2022-11-26 00:05:50,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:05:50,886 INFO L225 Difference]: With dead ends: 127 [2022-11-26 00:05:50,886 INFO L226 Difference]: Without dead ends: 125 [2022-11-26 00:05:50,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 259 SyntacticMatches, 32 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6532 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=638, Invalid=24802, Unknown=0, NotChecked=0, Total=25440 [2022-11-26 00:05:50,889 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 53 mSDsluCounter, 2691 mSDsCounter, 0 mSdLazyCounter, 8419 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 2722 SdHoareTripleChecker+Invalid, 8450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 8419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:05:50,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 2722 Invalid, 8450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 8419 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-11-26 00:05:50,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-26 00:05:50,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2022-11-26 00:05:50,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 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) [2022-11-26 00:05:50,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2022-11-26 00:05:50,992 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 119 [2022-11-26 00:05:50,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:05:50,992 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2022-11-26 00:05:50,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 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) [2022-11-26 00:05:50,993 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2022-11-26 00:05:50,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-26 00:05:50,993 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:05:50,994 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1, 1] [2022-11-26 00:05:50,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-26 00:05:51,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:05:51,195 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:05:51,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:05:51,195 INFO L85 PathProgramCache]: Analyzing trace with hash -201390085, now seen corresponding path program 50 times [2022-11-26 00:05:51,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:05:51,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485020327] [2022-11-26 00:05:51,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:05:51,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:05:51,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:05:53,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1191 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:05:53,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:05:53,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485020327] [2022-11-26 00:05:53,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485020327] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:05:53,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010837296] [2022-11-26 00:05:53,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:05:53,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:05:53,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:05:53,092 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:05:53,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-26 00:06:04,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-26 00:06:04,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:04,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 604 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-26 00:06:04,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:06,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:06,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:07,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:07,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010837296] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:07,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312474537] [2022-11-26 00:06:07,422 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:06:07,422 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:07,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:07,422 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:07,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:07,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:07,454 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:07,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:07,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:07,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:06:07,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:07,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:06:07,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:07,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:07,535 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:06:07,536 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:06:07,579 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 18 treesize of output 14 [2022-11-26 00:06:07,636 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:10,187 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37999#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:10,188 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:10,188 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:10,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 94 [2022-11-26 00:06:10,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287511897] [2022-11-26 00:06:10,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:10,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-26 00:06:10,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:10,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-26 00:06:10,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2033, Invalid=7669, Unknown=0, NotChecked=0, Total=9702 [2022-11-26 00:06:10,191 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 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) [2022-11-26 00:06:11,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:11,360 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2022-11-26 00:06:11,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-26 00:06:11,361 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 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 122 [2022-11-26 00:06:11,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:11,362 INFO L225 Difference]: With dead ends: 223 [2022-11-26 00:06:11,362 INFO L226 Difference]: Without dead ends: 130 [2022-11-26 00:06:11,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 240 SyntacticMatches, 89 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9540 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=3454, Invalid=12802, Unknown=0, NotChecked=0, Total=16256 [2022-11-26 00:06:11,364 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 336 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:11,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 301 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:06:11,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-26 00:06:11,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 124. [2022-11-26 00:06:11,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 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) [2022-11-26 00:06:11,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2022-11-26 00:06:11,445 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2022-11-26 00:06:11,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:11,445 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2022-11-26 00:06:11,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 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) [2022-11-26 00:06:11,445 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2022-11-26 00:06:11,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-26 00:06:11,446 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:11,446 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-26 00:06:11,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:11,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:11,651 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:11,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:11,651 INFO L85 PathProgramCache]: Analyzing trace with hash 997987553, now seen corresponding path program 51 times [2022-11-26 00:06:11,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:11,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315592373] [2022-11-26 00:06:11,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:11,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:15,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:15,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315592373] [2022-11-26 00:06:15,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315592373] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:15,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962683343] [2022-11-26 00:06:15,430 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:06:15,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:15,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:15,431 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:15,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-26 00:06:19,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:06:19,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:19,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 137 conjunts are in the unsatisfiable core [2022-11-26 00:06:19,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:19,958 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 15 treesize of output 11 [2022-11-26 00:06:23,423 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 47 treesize of output 23 [2022-11-26 00:06:23,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:23,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:24,208 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 16 treesize of output 14 [2022-11-26 00:06:24,210 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 24 treesize of output 20 [2022-11-26 00:06:24,215 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 16 treesize of output 14 [2022-11-26 00:06:24,217 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 24 treesize of output 20 [2022-11-26 00:06:24,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:24,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962683343] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:24,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199561028] [2022-11-26 00:06:24,337 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:06:24,337 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:24,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:24,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:24,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:24,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:24,361 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:06:24,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:06:24,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:24,385 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:24,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:24,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:24,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:06:24,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:24,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:24,454 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:06:24,455 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:06:24,496 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 18 treesize of output 14 [2022-11-26 00:06:24,549 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:29,027 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39392#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:29,028 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:29,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:29,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 65, 65] total 97 [2022-11-26 00:06:29,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489860667] [2022-11-26 00:06:29,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:29,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-26 00:06:29,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:29,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-26 00:06:29,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=10025, Unknown=0, NotChecked=0, Total=10302 [2022-11-26 00:06:29,031 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 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) [2022-11-26 00:06:34,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:34,960 INFO L93 Difference]: Finished difference Result 131 states and 132 transitions. [2022-11-26 00:06:34,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-26 00:06:34,960 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 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 123 [2022-11-26 00:06:34,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:34,960 INFO L225 Difference]: With dead ends: 131 [2022-11-26 00:06:34,960 INFO L226 Difference]: Without dead ends: 129 [2022-11-26 00:06:34,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 296 SyntacticMatches, 35 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3692 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=538, Invalid=18368, Unknown=0, NotChecked=0, Total=18906 [2022-11-26 00:06:34,962 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 45 mSDsluCounter, 2184 mSDsCounter, 0 mSdLazyCounter, 7539 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 2215 SdHoareTripleChecker+Invalid, 7571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 7539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:34,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 2215 Invalid, 7571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 7539 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-26 00:06:34,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-11-26 00:06:35,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2022-11-26 00:06:35,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 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) [2022-11-26 00:06:35,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2022-11-26 00:06:35,041 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 123 [2022-11-26 00:06:35,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:35,041 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2022-11-26 00:06:35,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 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) [2022-11-26 00:06:35,041 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2022-11-26 00:06:35,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-26 00:06:35,042 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:35,042 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1, 1] [2022-11-26 00:06:35,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:35,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:35,242 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:35,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:35,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1288361980, now seen corresponding path program 52 times [2022-11-26 00:06:35,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:35,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113977671] [2022-11-26 00:06:35,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:35,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:35,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:37,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1277 proven. 553 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:37,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:37,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113977671] [2022-11-26 00:06:37,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113977671] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:37,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327119632] [2022-11-26 00:06:37,197 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:06:37,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:37,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:37,199 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:37,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-26 00:06:37,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:37,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-26 00:06:37,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:39,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:39,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:41,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:41,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327119632] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:41,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230093475] [2022-11-26 00:06:41,010 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:06:41,010 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:41,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:41,011 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:41,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:41,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:41,035 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:41,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:41,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:41,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:06:41,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:41,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:41,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:41,107 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:41,131 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:06:41,131 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:06:41,194 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 18 treesize of output 14 [2022-11-26 00:06:41,234 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:41,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40699#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:41,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:41,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:41,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2022-11-26 00:06:41,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208503658] [2022-11-26 00:06:41,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:41,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-26 00:06:41,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:41,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-26 00:06:41,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2162, Invalid=8140, Unknown=0, NotChecked=0, Total=10302 [2022-11-26 00:06:41,821 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 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) [2022-11-26 00:06:42,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:42,987 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2022-11-26 00:06:42,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-26 00:06:42,988 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 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 126 [2022-11-26 00:06:42,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:42,989 INFO L225 Difference]: With dead ends: 230 [2022-11-26 00:06:42,989 INFO L226 Difference]: Without dead ends: 134 [2022-11-26 00:06:42,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 279 SyntacticMatches, 61 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7179 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3677, Invalid=13615, Unknown=0, NotChecked=0, Total=17292 [2022-11-26 00:06:42,990 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 352 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:42,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [352 Valid, 228 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:06:42,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-11-26 00:06:43,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 128. [2022-11-26 00:06:43,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 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) [2022-11-26 00:06:43,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-11-26 00:06:43,070 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 126 [2022-11-26 00:06:43,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:43,071 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-11-26 00:06:43,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 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) [2022-11-26 00:06:43,071 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-11-26 00:06:43,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-26 00:06:43,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:43,071 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-11-26 00:06:43,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:43,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:43,272 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:43,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:43,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1133183458, now seen corresponding path program 53 times [2022-11-26 00:06:43,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:43,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989155643] [2022-11-26 00:06:43,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:43,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:43,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:47,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:47,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:47,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989155643] [2022-11-26 00:06:47,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989155643] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:47,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523723481] [2022-11-26 00:06:47,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:06:47,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:47,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:47,107 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:47,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-26 00:07:26,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-11-26 00:07:26,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:07:26,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 159 conjunts are in the unsatisfiable core [2022-11-26 00:07:26,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:07:28,733 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 13 treesize of output 9 [2022-11-26 00:07:34,962 INFO L321 Elim1Store]: treesize reduction 28, result has 9.7 percent of original size [2022-11-26 00:07:34,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 60 treesize of output 29 [2022-11-26 00:07:35,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1001 proven. 860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:07:35,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:07:43,762 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 53 treesize of output 47 [2022-11-26 00:07:43,769 INFO L321 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2022-11-26 00:07:43,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 82 treesize of output 68 [2022-11-26 00:07:49,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1293 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:07:49,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523723481] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:07:49,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1157239490] [2022-11-26 00:07:49,424 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:07:49,424 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:07:49,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:07:49,424 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:07:49,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:07:49,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:49,452 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:07:49,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:07:49,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:49,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:07:49,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:49,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:07:49,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:49,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:07:49,535 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:07:49,536 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:07:49,596 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 18 treesize of output 14 [2022-11-26 00:07:49,654 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:07:50,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42238#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:07:50,906 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:07:50,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:07:50,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 70, 70] total 201 [2022-11-26 00:07:50,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986394008] [2022-11-26 00:07:50,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:07:50,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 201 states [2022-11-26 00:07:50,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:07:50,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 201 interpolants. [2022-11-26 00:07:50,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3336, Invalid=38893, Unknown=1, NotChecked=0, Total=42230 [2022-11-26 00:07:50,912 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 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) [2022-11-26 00:08:12,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:08:12,316 INFO L93 Difference]: Finished difference Result 230 states and 233 transitions. [2022-11-26 00:08:12,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2022-11-26 00:08:12,316 INFO L78 Accepts]: Start accepts. Automaton has has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 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 127 [2022-11-26 00:08:12,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:08:12,317 INFO L225 Difference]: With dead ends: 230 [2022-11-26 00:08:12,317 INFO L226 Difference]: Without dead ends: 134 [2022-11-26 00:08:12,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 342 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30915 ImplicationChecksByTransitivity, 40.7s TimeCoverageRelationStatistics Valid=8242, Invalid=109749, Unknown=1, NotChecked=0, Total=117992 [2022-11-26 00:08:12,325 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 386 mSDsluCounter, 2395 mSDsCounter, 0 mSdLazyCounter, 8539 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 2426 SdHoareTripleChecker+Invalid, 8747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 8539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-11-26 00:08:12,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 2426 Invalid, 8747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 8539 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-11-26 00:08:12,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-11-26 00:08:12,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 132. [2022-11-26 00:08:12,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 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) [2022-11-26 00:08:12,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2022-11-26 00:08:12,405 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 127 [2022-11-26 00:08:12,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:08:12,405 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2022-11-26 00:08:12,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 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) [2022-11-26 00:08:12,405 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2022-11-26 00:08:12,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-26 00:08:12,406 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:08:12,406 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-11-26 00:08:12,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-26 00:08:12,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-26 00:08:12,607 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:08:12,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:08:12,607 INFO L85 PathProgramCache]: Analyzing trace with hash -219806143, now seen corresponding path program 54 times [2022-11-26 00:08:12,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:08:12,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676894825] [2022-11-26 00:08:12,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:08:12,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:08:12,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:16,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:16,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:08:16,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676894825] [2022-11-26 00:08:16,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676894825] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:08:16,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904837453] [2022-11-26 00:08:16,912 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:08:16,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:16,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:08:16,913 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:08:16,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-26 00:08:20,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:08:20,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:08:20,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-26 00:08:20,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:08:20,282 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 15 treesize of output 11 [2022-11-26 00:08:24,246 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 47 treesize of output 23 [2022-11-26 00:08:24,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:24,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:08:25,101 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 16 treesize of output 14 [2022-11-26 00:08:25,103 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 24 treesize of output 20 [2022-11-26 00:08:25,109 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 16 treesize of output 14 [2022-11-26 00:08:25,111 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 24 treesize of output 20 [2022-11-26 00:08:25,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:25,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904837453] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:08:25,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [639675901] [2022-11-26 00:08:25,241 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:08:25,242 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:08:25,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:08:25,242 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:08:25,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:08:25,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:25,268 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:08:25,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:08:25,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:25,294 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:08:25,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:08:25,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:25,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:08:25,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:25,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:25,362 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:08:25,363 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:08:25,411 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 18 treesize of output 14 [2022-11-26 00:08:25,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:08:30,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43927#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:08:30,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:08:30,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:08:30,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 69, 69] total 103 [2022-11-26 00:08:30,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790281310] [2022-11-26 00:08:30,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:08:30,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-26 00:08:30,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:08:30,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-26 00:08:30,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=11263, Unknown=0, NotChecked=0, Total=11556 [2022-11-26 00:08:30,690 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 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) [2022-11-26 00:08:37,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:08:37,299 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2022-11-26 00:08:37,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-26 00:08:37,300 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 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 131 [2022-11-26 00:08:37,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:08:37,300 INFO L225 Difference]: With dead ends: 139 [2022-11-26 00:08:37,300 INFO L226 Difference]: Without dead ends: 137 [2022-11-26 00:08:37,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 316 SyntacticMatches, 37 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4126 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=568, Invalid=20602, Unknown=0, NotChecked=0, Total=21170 [2022-11-26 00:08:37,302 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 50 mSDsluCounter, 2610 mSDsCounter, 0 mSdLazyCounter, 8227 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 2643 SdHoareTripleChecker+Invalid, 8262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 8227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:08:37,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 2643 Invalid, 8262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 8227 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-26 00:08:37,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-26 00:08:37,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2022-11-26 00:08:37,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 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) [2022-11-26 00:08:37,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2022-11-26 00:08:37,444 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 131 [2022-11-26 00:08:37,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:08:37,445 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2022-11-26 00:08:37,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 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) [2022-11-26 00:08:37,445 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2022-11-26 00:08:37,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-26 00:08:37,446 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:08:37,446 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1] [2022-11-26 00:08:37,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-26 00:08:37,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-11-26 00:08:37,663 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:08:37,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:08:37,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1585113756, now seen corresponding path program 55 times [2022-11-26 00:08:37,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:08:37,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320326058] [2022-11-26 00:08:37,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:08:37,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:08:37,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:40,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:40,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:08:40,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320326058] [2022-11-26 00:08:40,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320326058] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:08:40,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102125699] [2022-11-26 00:08:40,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:08:40,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:40,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:08:40,021 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:08:40,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-26 00:08:40,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:40,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-26 00:08:40,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:08:42,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:42,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:08:44,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:44,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102125699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:08:44,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461801678] [2022-11-26 00:08:44,334 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:08:44,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:08:44,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:08:44,335 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:08:44,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:08:44,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:44,357 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:08:44,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:08:44,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:44,381 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:08:44,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:08:44,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:44,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:08:44,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:08:44,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:08:44,457 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:08:44,458 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:08:44,548 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 18 treesize of output 14 [2022-11-26 00:08:44,586 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:08:45,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45316#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:08:45,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:08:45,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:08:45,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-11-26 00:08:45,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446250489] [2022-11-26 00:08:45,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:08:45,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-26 00:08:45,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:08:45,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-26 00:08:45,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2432, Invalid=9124, Unknown=0, NotChecked=0, Total=11556 [2022-11-26 00:08:45,210 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 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) [2022-11-26 00:08:46,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:08:46,516 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2022-11-26 00:08:46,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-26 00:08:46,516 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 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 134 [2022-11-26 00:08:46,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:08:46,517 INFO L225 Difference]: With dead ends: 244 [2022-11-26 00:08:46,517 INFO L226 Difference]: Without dead ends: 142 [2022-11-26 00:08:46,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 297 SyntacticMatches, 65 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8072 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4144, Invalid=15316, Unknown=0, NotChecked=0, Total=19460 [2022-11-26 00:08:46,519 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 404 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:08:46,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [404 Valid, 254 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:08:46,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-26 00:08:46,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 136. [2022-11-26 00:08:46,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 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) [2022-11-26 00:08:46,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-11-26 00:08:46,660 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2022-11-26 00:08:46,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:08:46,660 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-11-26 00:08:46,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 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) [2022-11-26 00:08:46,661 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-11-26 00:08:46,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-26 00:08:46,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:08:46,662 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2022-11-26 00:08:46,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-26 00:08:46,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:46,862 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:08:46,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:08:46,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1065496958, now seen corresponding path program 56 times [2022-11-26 00:08:46,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:08:46,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908704626] [2022-11-26 00:08:46,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:08:46,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:08:46,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:51,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:08:51,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:08:51,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908704626] [2022-11-26 00:08:51,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908704626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:08:51,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898211778] [2022-11-26 00:08:51,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:08:51,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:51,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:08:51,493 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:08:51,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-26 00:09:11,449 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-11-26 00:09:11,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:09:11,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 144 conjunts are in the unsatisfiable core [2022-11-26 00:09:11,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:09:11,571 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 15 treesize of output 11 [2022-11-26 00:09:15,508 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 47 treesize of output 23 [2022-11-26 00:09:15,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:15,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:09:16,279 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 16 treesize of output 14 [2022-11-26 00:09:16,281 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 24 treesize of output 20 [2022-11-26 00:09:16,287 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 16 treesize of output 14 [2022-11-26 00:09:16,289 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 24 treesize of output 20 [2022-11-26 00:09:16,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:16,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898211778] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:09:16,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1856423548] [2022-11-26 00:09:16,421 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:09:16,421 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:09:16,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:09:16,422 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:09:16,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:09:16,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:16,451 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:09:16,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:09:16,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:16,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:09:16,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:16,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:09:16,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:16,511 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:09:16,535 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:09:16,536 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:09:16,597 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 18 treesize of output 14 [2022-11-26 00:09:16,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:09:17,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46842#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:09:17,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:09:17,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:09:17,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 104 [2022-11-26 00:09:17,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308109691] [2022-11-26 00:09:17,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:09:17,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-26 00:09:17,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:09:17,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-26 00:09:17,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=11482, Unknown=0, NotChecked=0, Total=11772 [2022-11-26 00:09:17,620 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 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) [2022-11-26 00:09:24,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:09:24,342 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2022-11-26 00:09:24,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-26 00:09:24,343 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 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 135 [2022-11-26 00:09:24,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:09:24,344 INFO L225 Difference]: With dead ends: 143 [2022-11-26 00:09:24,344 INFO L226 Difference]: Without dead ends: 141 [2022-11-26 00:09:24,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 361 SyntacticMatches, 5 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=541, Invalid=20339, Unknown=0, NotChecked=0, Total=20880 [2022-11-26 00:09:24,346 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 46 mSDsluCounter, 2778 mSDsCounter, 0 mSdLazyCounter, 8820 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 2813 SdHoareTripleChecker+Invalid, 8854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 8820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:09:24,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 2813 Invalid, 8854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 8820 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-26 00:09:24,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-26 00:09:24,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2022-11-26 00:09:24,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 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) [2022-11-26 00:09:24,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2022-11-26 00:09:24,446 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 135 [2022-11-26 00:09:24,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:09:24,447 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2022-11-26 00:09:24,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 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) [2022-11-26 00:09:24,447 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2022-11-26 00:09:24,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-26 00:09:24,447 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:09:24,447 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1] [2022-11-26 00:09:24,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-26 00:09:24,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-26 00:09:24,648 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:09:24,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:09:24,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1888202427, now seen corresponding path program 57 times [2022-11-26 00:09:24,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:09:24,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946199201] [2022-11-26 00:09:24,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:09:24,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:09:24,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:09:27,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:27,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:09:27,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946199201] [2022-11-26 00:09:27,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946199201] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:09:27,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149779595] [2022-11-26 00:09:27,009 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:09:27,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:09:27,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:09:27,010 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:09:27,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-26 00:09:37,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:09:37,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:09:37,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-26 00:09:37,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:09:40,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:40,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:09:41,970 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:41,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149779595] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:09:41,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557547868] [2022-11-26 00:09:41,971 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:09:41,971 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:09:41,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:09:41,971 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:09:41,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:09:41,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:41,996 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:09:41,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:09:42,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:42,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:09:42,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:42,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:09:42,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:42,057 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:09:42,081 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:09:42,082 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:09:42,135 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 18 treesize of output 14 [2022-11-26 00:09:42,179 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:09:42,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48266#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:09:42,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:09:42,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:09:42,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 106 [2022-11-26 00:09:42,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555221872] [2022-11-26 00:09:42,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:09:42,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-26 00:09:42,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:09:42,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-26 00:09:42,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2573, Invalid=9637, Unknown=0, NotChecked=0, Total=12210 [2022-11-26 00:09:42,812 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 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) [2022-11-26 00:09:44,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:09:44,191 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2022-11-26 00:09:44,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-26 00:09:44,192 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 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 138 [2022-11-26 00:09:44,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:09:44,193 INFO L225 Difference]: With dead ends: 251 [2022-11-26 00:09:44,193 INFO L226 Difference]: Without dead ends: 146 [2022-11-26 00:09:44,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 306 SyntacticMatches, 67 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8538 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4388, Invalid=16204, Unknown=0, NotChecked=0, Total=20592 [2022-11-26 00:09:44,195 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 456 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:09:44,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [456 Valid, 352 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 722 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:09:44,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-26 00:09:44,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2022-11-26 00:09:44,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 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) [2022-11-26 00:09:44,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2022-11-26 00:09:44,296 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 138 [2022-11-26 00:09:44,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:09:44,296 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2022-11-26 00:09:44,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 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) [2022-11-26 00:09:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2022-11-26 00:09:44,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-11-26 00:09:44,297 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:09:44,297 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1, 1] [2022-11-26 00:09:44,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-26 00:09:44,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-26 00:09:44,503 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:09:44,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:09:44,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1928450143, now seen corresponding path program 58 times [2022-11-26 00:09:44,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:09:44,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020766074] [2022-11-26 00:09:44,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:09:44,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:09:44,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:09:49,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:49,158 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:09:49,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020766074] [2022-11-26 00:09:49,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020766074] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:09:49,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360759330] [2022-11-26 00:09:49,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:09:49,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:09:49,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:09:49,159 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:09:49,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-26 00:09:49,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:09:49,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 689 conjuncts, 218 conjunts are in the unsatisfiable core [2022-11-26 00:09:49,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:09:52,841 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 13 treesize of output 9 [2022-11-26 00:09:57,745 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:57,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:09:58,425 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 16 treesize of output 14 [2022-11-26 00:09:58,426 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 24 treesize of output 20 [2022-11-26 00:09:58,432 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 16 treesize of output 14 [2022-11-26 00:09:58,434 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 24 treesize of output 20 [2022-11-26 00:09:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:09:58,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360759330] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:09:58,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [264969955] [2022-11-26 00:09:58,579 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:09:58,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:09:58,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:09:58,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:09:58,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:09:58,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:58,603 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:09:58,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:09:58,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:58,627 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:09:58,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:09:58,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:58,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:09:58,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:58,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:58,694 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:09:58,695 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:09:58,731 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 18 treesize of output 14 [2022-11-26 00:09:58,768 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:09:59,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49873#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:09:59,879 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:09:59,879 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:09:59,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2022-11-26 00:09:59,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547116914] [2022-11-26 00:09:59,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:09:59,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-26 00:09:59,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:09:59,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-26 00:09:59,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=21314, Unknown=0, NotChecked=0, Total=21756 [2022-11-26 00:09:59,882 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 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) [2022-11-26 00:10:07,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:10:07,233 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2022-11-26 00:10:07,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-11-26 00:10:07,234 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 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 139 [2022-11-26 00:10:07,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:10:07,235 INFO L225 Difference]: With dead ends: 147 [2022-11-26 00:10:07,235 INFO L226 Difference]: Without dead ends: 145 [2022-11-26 00:10:07,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 338 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6210 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=738, Invalid=33302, Unknown=0, NotChecked=0, Total=34040 [2022-11-26 00:10:07,236 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 54 mSDsluCounter, 3489 mSDsCounter, 0 mSdLazyCounter, 10580 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 3525 SdHoareTripleChecker+Invalid, 10616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 10580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:10:07,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 3525 Invalid, 10616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 10580 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-26 00:10:07,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-11-26 00:10:07,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 143. [2022-11-26 00:10:07,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 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) [2022-11-26 00:10:07,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2022-11-26 00:10:07,332 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 139 [2022-11-26 00:10:07,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:10:07,332 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2022-11-26 00:10:07,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 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) [2022-11-26 00:10:07,333 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2022-11-26 00:10:07,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-26 00:10:07,333 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:10:07,333 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1] [2022-11-26 00:10:07,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-26 00:10:07,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-26 00:10:07,540 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:10:07,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:10:07,541 INFO L85 PathProgramCache]: Analyzing trace with hash -970865348, now seen corresponding path program 59 times [2022-11-26 00:10:07,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:10:07,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417984118] [2022-11-26 00:10:07,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:10:07,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:10:07,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:10:09,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:09,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:10:09,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417984118] [2022-11-26 00:10:09,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417984118] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:10:09,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820527072] [2022-11-26 00:10:09,997 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:10:09,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:10:09,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:10:09,999 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:10:10,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-26 00:10:26,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-11-26 00:10:26,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:10:26,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-26 00:10:26,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:10:28,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:28,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:10:30,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:30,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820527072] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:10:30,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1279151787] [2022-11-26 00:10:30,798 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:10:30,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:10:30,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:10:30,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:10:30,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:10:30,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:30,823 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:10:30,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:10:30,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:30,847 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:10:30,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:10:30,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:30,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:10:30,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:30,898 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:10:30,921 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-26 00:10:30,922 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 4 case distinctions, treesize of input 199 treesize of output 202 [2022-11-26 00:10:30,963 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 18 treesize of output 14 [2022-11-26 00:10:31,010 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:10:31,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51338#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:10:31,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:10:31,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:10:31,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-11-26 00:10:31,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363248191] [2022-11-26 00:10:31,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:10:31,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-26 00:10:31,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:10:31,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-26 00:10:31,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2718, Invalid=10164, Unknown=0, NotChecked=0, Total=12882 [2022-11-26 00:10:31,663 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 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) [2022-11-26 00:10:33,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:10:33,108 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2022-11-26 00:10:33,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-26 00:10:33,109 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 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 142 [2022-11-26 00:10:33,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:10:33,109 INFO L225 Difference]: With dead ends: 258 [2022-11-26 00:10:33,110 INFO L226 Difference]: Without dead ends: 150 [2022-11-26 00:10:33,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 315 SyntacticMatches, 69 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9017 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4639, Invalid=17117, Unknown=0, NotChecked=0, Total=21756 [2022-11-26 00:10:33,111 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 382 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:10:33,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [382 Valid, 379 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:10:33,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-11-26 00:10:33,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 144. [2022-11-26 00:10:33,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 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) [2022-11-26 00:10:33,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2022-11-26 00:10:33,257 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 142 [2022-11-26 00:10:33,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:10:33,257 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2022-11-26 00:10:33,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 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) [2022-11-26 00:10:33,258 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2022-11-26 00:10:33,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-26 00:10:33,258 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:10:33,258 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1, 1] [2022-11-26 00:10:33,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-26 00:10:33,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2022-11-26 00:10:33,459 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:10:33,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:10:33,459 INFO L85 PathProgramCache]: Analyzing trace with hash -368221406, now seen corresponding path program 60 times [2022-11-26 00:10:33,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:10:33,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357487323] [2022-11-26 00:10:33,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:10:33,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:10:33,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:10:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:38,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:10:38,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357487323] [2022-11-26 00:10:38,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357487323] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:10:38,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815475689] [2022-11-26 00:10:38,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:10:38,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:10:38,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:10:38,580 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:10:38,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-26 00:10:41,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:10:41,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:10:41,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 159 conjunts are in the unsatisfiable core [2022-11-26 00:10:41,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:10:44,704 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 13 treesize of output 9 [2022-11-26 00:10:50,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:50,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:10:50,980 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 16 treesize of output 14 [2022-11-26 00:10:50,982 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 24 treesize of output 20 [2022-11-26 00:10:50,987 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 16 treesize of output 14 [2022-11-26 00:10:50,989 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 24 treesize of output 20 [2022-11-26 00:10:51,133 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:10:51,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815475689] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:10:51,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2095732858] [2022-11-26 00:10:51,134 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:10:51,134 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:10:51,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:10:51,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:10:51,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:10:51,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:51,162 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:10:51,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:10:51,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:51,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2022-11-26 00:10:51,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:51,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:10:51,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:51,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:10:51,246 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:10:51,246 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:10:51,283 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 18 treesize of output 14 [2022-11-26 00:10:51,327 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:10:52,493 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52993#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 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~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:10:52,493 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:10:52,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:10:52,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 75, 75] total 149 [2022-11-26 00:10:52,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133974916] [2022-11-26 00:10:52,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:10:52,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-11-26 00:10:52,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:10:52,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-11-26 00:10:52,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=466, Invalid=23096, Unknown=0, NotChecked=0, Total=23562 [2022-11-26 00:10:52,496 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 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) [2022-11-26 00:11:00,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:11:00,631 INFO L93 Difference]: Finished difference Result 151 states and 152 transitions. [2022-11-26 00:11:00,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-11-26 00:11:00,631 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 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 143 [2022-11-26 00:11:00,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:11:00,632 INFO L225 Difference]: With dead ends: 151 [2022-11-26 00:11:00,632 INFO L226 Difference]: Without dead ends: 149 [2022-11-26 00:11:00,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 346 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7124 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=804, Invalid=37026, Unknown=0, NotChecked=0, Total=37830 [2022-11-26 00:11:00,636 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 62 mSDsluCounter, 3455 mSDsCounter, 0 mSdLazyCounter, 11231 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 3491 SdHoareTripleChecker+Invalid, 11270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 11231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:11:00,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 3491 Invalid, 11270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 11231 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-11-26 00:11:00,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-11-26 00:11:00,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2022-11-26 00:11:00,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 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) [2022-11-26 00:11:00,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2022-11-26 00:11:00,732 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 143 [2022-11-26 00:11:00,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:11:00,733 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2022-11-26 00:11:00,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 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) [2022-11-26 00:11:00,733 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2022-11-26 00:11:00,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-11-26 00:11:00,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:11:00,734 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1, 1] [2022-11-26 00:11:00,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-26 00:11:00,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:11:00,948 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:11:00,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:11:00,948 INFO L85 PathProgramCache]: Analyzing trace with hash -332638693, now seen corresponding path program 61 times [2022-11-26 00:11:00,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:11:00,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267810804] [2022-11-26 00:11:00,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:11:00,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:11:01,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:11:03,641 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1752 proven. 733 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:11:03,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:11:03,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267810804] [2022-11-26 00:11:03,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267810804] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:11:03,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812068463] [2022-11-26 00:11:03,642 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:11:03,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:11:03,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:11:03,643 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:11:03,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_715f65ec-6e6e-4405-8ef8-3e2c954a9bd7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-26 00:11:04,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:11:04,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-26 00:11:04,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:11:06,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:11:06,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:11:08,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:11:08,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812068463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:11:08,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1284260770] [2022-11-26 00:11:08,595 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:11:08,595 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:11:08,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:11:08,596 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:11:08,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:11:08,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:11:08,621 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-26 00:11:08,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-26 00:11:08,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:11:08,644 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:11:08,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:11:08,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:11:08,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2022-11-26 00:11:08,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:11:08,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:11:08,709 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-26 00:11:08,709 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 3 case distinctions, treesize of input 206 treesize of output 203 [2022-11-26 00:11:08,751 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 18 treesize of output 14 [2022-11-26 00:11:08,807 INFO L180 IcfgInterpreter]: Interpretation finished