./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW --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 afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 --- 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-4e7fbc6 [2022-11-23 15:35:34,305 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 15:35:34,307 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 15:35:34,332 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 15:35:34,333 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 15:35:34,336 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 15:35:34,339 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 15:35:34,343 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 15:35:34,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 15:35:34,353 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 15:35:34,355 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 15:35:34,357 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 15:35:34,357 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 15:35:34,363 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 15:35:34,364 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 15:35:34,365 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 15:35:34,366 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 15:35:34,367 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 15:35:34,368 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 15:35:34,370 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 15:35:34,371 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 15:35:34,376 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 15:35:34,378 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 15:35:34,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 15:35:34,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 15:35:34,393 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 15:35:34,393 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 15:35:34,394 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 15:35:34,394 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 15:35:34,395 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 15:35:34,396 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 15:35:34,397 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 15:35:34,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 15:35:34,398 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 15:35:34,399 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 15:35:34,399 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 15:35:34,400 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 15:35:34,400 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 15:35:34,401 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 15:35:34,402 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 15:35:34,402 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 15:35:34,410 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 15:35:34,462 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 15:35:34,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 15:35:34,463 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 15:35:34,463 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 15:35:34,464 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 15:35:34,464 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 15:35:34,465 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 15:35:34,465 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 15:35:34,465 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 15:35:34,465 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 15:35:34,466 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 15:35:34,466 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 15:35:34,467 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 15:35:34,467 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 15:35:34,467 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 15:35:34,467 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 15:35:34,467 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 15:35:34,468 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 15:35:34,468 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 15:35:34,468 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 15:35:34,469 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 15:35:34,469 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 15:35:34,469 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 15:35:34,469 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 15:35:34,469 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 15:35:34,470 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 15:35:34,470 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 15:35:34,470 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 15:35:34,470 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 15:35:34,471 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 15:35:34,471 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 15:35:34,471 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 15:35:34,471 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:35:34,472 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 15:35:34,472 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 15:35:34,472 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 15:35:34,472 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 15:35:34,472 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 15:35:34,472 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 15:35:34,473 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 15:35:34,473 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 15:35:34,473 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_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 [2022-11-23 15:35:34,774 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 15:35:34,816 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 15:35:34,818 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 15:35:34,820 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 15:35:34,820 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 15:35:34,822 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/array-crafted/zero_sum_m5.c [2022-11-23 15:35:38,002 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 15:35:38,232 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 15:35:38,233 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/sv-benchmarks/c/array-crafted/zero_sum_m5.c [2022-11-23 15:35:38,242 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/data/a5b2b8af4/4a1d13c6d0f74f65838d9a3359828403/FLAGe14558430 [2022-11-23 15:35:38,257 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/data/a5b2b8af4/4a1d13c6d0f74f65838d9a3359828403 [2022-11-23 15:35:38,259 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 15:35:38,261 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 15:35:38,263 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 15:35:38,263 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 15:35:38,267 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 15:35:38,268 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,269 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e4bdf49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38, skipping insertion in model container [2022-11-23 15:35:38,269 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,301 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 15:35:38,341 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 15:35:38,516 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_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2022-11-23 15:35:38,540 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:35:38,549 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 15:35:38,560 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_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2022-11-23 15:35:38,575 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:35:38,590 INFO L208 MainTranslator]: Completed translation [2022-11-23 15:35:38,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38 WrapperNode [2022-11-23 15:35:38,591 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 15:35:38,592 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 15:35:38,592 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 15:35:38,593 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 15:35:38,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,609 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,633 INFO L138 Inliner]: procedures = 15, calls = 21, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 149 [2022-11-23 15:35:38,633 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 15:35:38,634 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 15:35:38,634 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 15:35:38,634 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 15:35:38,644 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,644 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,646 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,647 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,658 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,660 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,661 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,664 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 15:35:38,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 15:35:38,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 15:35:38,665 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 15:35:38,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (1/1) ... [2022-11-23 15:35:38,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:35:38,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:38,698 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 15:35:38,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 15:35:38,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 15:35:38,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 15:35:38,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 15:35:38,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 15:35:38,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 15:35:38,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 15:35:38,742 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 15:35:38,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 15:35:38,808 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 15:35:38,810 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 15:35:39,049 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 15:35:39,155 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 15:35:39,156 INFO L300 CfgBuilder]: Removed 11 assume(true) statements. [2022-11-23 15:35:39,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:35:39 BoogieIcfgContainer [2022-11-23 15:35:39,162 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 15:35:39,164 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 15:35:39,164 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 15:35:39,168 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 15:35:39,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:35:38" (1/3) ... [2022-11-23 15:35:39,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2133236a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:35:39, skipping insertion in model container [2022-11-23 15:35:39,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:38" (2/3) ... [2022-11-23 15:35:39,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2133236a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:35:39, skipping insertion in model container [2022-11-23 15:35:39,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:35:39" (3/3) ... [2022-11-23 15:35:39,171 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m5.c [2022-11-23 15:35:39,191 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 15:35:39,191 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 15:35:39,242 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 15:35:39,249 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;@c3bdd3b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 15:35:39,249 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 15:35:39,253 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:39,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 15:35:39,260 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:39,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:39,261 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:39,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:39,266 INFO L85 PathProgramCache]: Analyzing trace with hash 736515381, now seen corresponding path program 1 times [2022-11-23 15:35:39,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:39,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777711475] [2022-11-23 15:35:39,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:39,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:39,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:39,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:35:39,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:39,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777711475] [2022-11-23 15:35:39,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777711475] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:35:39,621 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:35:39,622 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:35:39,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504682799] [2022-11-23 15:35:39,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:35:39,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:35:39,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:39,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:35:39,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:35:39,693 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 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 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:39,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:39,854 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2022-11-23 15:35:39,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:35:39,857 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-23 15:35:39,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:39,865 INFO L225 Difference]: With dead ends: 36 [2022-11-23 15:35:39,866 INFO L226 Difference]: Without dead ends: 17 [2022-11-23 15:35:39,869 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 [2022-11-23 15:35:39,874 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:39,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:35:39,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-23 15:35:39,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-23 15:35:39,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:39,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2022-11-23 15:35:39,908 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2022-11-23 15:35:39,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:39,909 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2022-11-23 15:35:39,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:39,909 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2022-11-23 15:35:39,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 15:35:39,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:39,910 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:39,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 15:35:39,910 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:39,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:39,911 INFO L85 PathProgramCache]: Analyzing trace with hash -1473336354, now seen corresponding path program 1 times [2022-11-23 15:35:39,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:39,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419332879] [2022-11-23 15:35:39,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:39,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:40,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:35:40,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:40,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419332879] [2022-11-23 15:35:40,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419332879] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:35:40,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:35:40,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 15:35:40,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587725058] [2022-11-23 15:35:40,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:35:40,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 15:35:40,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:40,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 15:35:40,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:35:40,013 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 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) [2022-11-23 15:35:40,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:40,091 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2022-11-23 15:35:40,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 15:35:40,091 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-23 15:35:40,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:40,092 INFO L225 Difference]: With dead ends: 39 [2022-11-23 15:35:40,092 INFO L226 Difference]: Without dead ends: 27 [2022-11-23 15:35:40,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:35:40,094 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:40,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 5 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:35:40,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-23 15:35:40,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-23 15:35:40,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 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) [2022-11-23 15:35:40,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2022-11-23 15:35:40,102 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2022-11-23 15:35:40,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:40,103 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2022-11-23 15:35:40,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 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) [2022-11-23 15:35:40,103 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2022-11-23 15:35:40,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 15:35:40,104 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:40,104 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:40,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 15:35:40,105 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:40,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:40,105 INFO L85 PathProgramCache]: Analyzing trace with hash 479326558, now seen corresponding path program 1 times [2022-11-23 15:35:40,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:40,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124834617] [2022-11-23 15:35:40,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:40,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:40,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:35:40,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124834617] [2022-11-23 15:35:40,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124834617] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:35:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290545314] [2022-11-23 15:35:40,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:40,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:40,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:40,346 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:35:40,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 15:35:40,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:40,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 15:35:40,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:35:40,572 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:35:40,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:35:40,637 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:35:40,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290545314] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:35:40,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500506326] [2022-11-23 15:35:40,668 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:35:40,669 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:35:40,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:35:40,678 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:35:40,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:35:40,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:40,842 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:35:40,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:35:40,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:40,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:35:40,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:40,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:35:41,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:41,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:41,142 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:35:41,142 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 244 treesize of output 232 [2022-11-23 15:35:41,266 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 16 treesize of output 12 [2022-11-23 15:35:41,805 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:35:42,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '394#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:35:42,195 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:35:42,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:35:42,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-23 15:35:42,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930115001] [2022-11-23 15:35:42,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:35:42,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 15:35:42,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:42,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 15:35:42,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-23 15:35:42,198 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:42,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:42,267 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2022-11-23 15:35:42,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 15:35:42,268 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-23 15:35:42,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:42,269 INFO L225 Difference]: With dead ends: 51 [2022-11-23 15:35:42,269 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 15:35:42,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 61 SyntacticMatches, 9 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-23 15:35:42,271 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:42,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:35:42,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 15:35:42,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-23 15:35:42,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:42,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-23 15:35:42,278 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2022-11-23 15:35:42,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:42,279 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-23 15:35:42,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:42,279 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-23 15:35:42,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 15:35:42,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:42,280 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:42,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 15:35:42,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:42,487 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:42,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:42,487 INFO L85 PathProgramCache]: Analyzing trace with hash 1696466709, now seen corresponding path program 2 times [2022-11-23 15:35:42,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:42,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858615010] [2022-11-23 15:35:42,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:42,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:42,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:42,625 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:35:42,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:42,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858615010] [2022-11-23 15:35:42,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858615010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:35:42,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295396338] [2022-11-23 15:35:42,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:35:42,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:42,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:42,627 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:35:42,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 15:35:42,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 15:35:42,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:35:42,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 15:35:42,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:35:42,787 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:35:42,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:35:42,850 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:35:42,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295396338] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:35:42,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95738117] [2022-11-23 15:35:42,857 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:35:42,857 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:35:42,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:35:42,858 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:35:42,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:35:42,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:42,929 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:35:42,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:35:42,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:42,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:35:42,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:42,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:35:43,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:43,067 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:35:43,098 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:35:43,099 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 234 treesize of output 233 [2022-11-23 15:35:43,222 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 16 treesize of output 12 [2022-11-23 15:35:43,541 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:35:43,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '708#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:35:43,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:35:43,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:35:43,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-23 15:35:43,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855148750] [2022-11-23 15:35:43,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:35:43,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 15:35:43,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:43,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 15:35:43,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-23 15:35:43,958 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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) [2022-11-23 15:35:44,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:44,090 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2022-11-23 15:35:44,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:35:44,091 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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) Word has length 27 [2022-11-23 15:35:44,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:44,094 INFO L225 Difference]: With dead ends: 59 [2022-11-23 15:35:44,095 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 15:35:44,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 17 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-23 15:35:44,100 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:44,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 9 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:35:44,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 15:35:44,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-23 15:35:44,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 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) [2022-11-23 15:35:44,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2022-11-23 15:35:44,114 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2022-11-23 15:35:44,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:44,115 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2022-11-23 15:35:44,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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) [2022-11-23 15:35:44,115 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2022-11-23 15:35:44,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-23 15:35:44,117 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:44,117 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:44,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 15:35:44,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:44,324 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:44,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:44,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1441672107, now seen corresponding path program 3 times [2022-11-23 15:35:44,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:44,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420331015] [2022-11-23 15:35:44,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:44,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:44,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:49,527 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:35:49,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:49,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420331015] [2022-11-23 15:35:49,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420331015] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:35:49,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126693275] [2022-11-23 15:35:49,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:35:49,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:49,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:49,531 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:35:49,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 15:35:49,633 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:35:49,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:35:49,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-23 15:35:49,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:35:49,669 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 [2022-11-23 15:35:50,663 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:35:50,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:35:52,694 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 15:35:52,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126693275] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:35:52,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1623271559] [2022-11-23 15:35:52,697 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:35:52,697 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:35:52,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:35:52,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:35:52,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:35:52,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:52,745 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:35:52,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:35:52,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:52,791 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:35:52,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:35:52,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:52,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:35:52,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:52,901 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:35:52,927 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:35:52,928 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 234 treesize of output 233 [2022-11-23 15:35:53,013 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 16 treesize of output 12 [2022-11-23 15:35:53,274 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:35:55,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1164#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:35:55,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:35:55,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:35:55,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 29] total 54 [2022-11-23 15:35:55,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973784110] [2022-11-23 15:35:55,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:35:55,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-23 15:35:55,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:55,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-23 15:35:55,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3259, Unknown=0, NotChecked=0, Total=3422 [2022-11-23 15:35:55,056 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:56,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:56,434 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2022-11-23 15:35:56,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:35:56,434 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 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 37 [2022-11-23 15:35:56,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:56,435 INFO L225 Difference]: With dead ends: 69 [2022-11-23 15:35:56,435 INFO L226 Difference]: Without dead ends: 66 [2022-11-23 15:35:56,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 45 SyntacticMatches, 43 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1492 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=169, Invalid=3371, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 15:35:56,438 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:56,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 77 Invalid, 1702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-23 15:35:56,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-23 15:35:56,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-11-23 15:35:56,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 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) [2022-11-23 15:35:56,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2022-11-23 15:35:56,452 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2022-11-23 15:35:56,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:56,452 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2022-11-23 15:35:56,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:35:56,453 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2022-11-23 15:35:56,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-23 15:35:56,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:56,454 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:56,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 15:35:56,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:56,660 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:56,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:56,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1123091444, now seen corresponding path program 4 times [2022-11-23 15:35:56,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:56,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584394513] [2022-11-23 15:35:56,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:56,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:56,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:56,796 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-23 15:35:56,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:56,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584394513] [2022-11-23 15:35:56,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584394513] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:35:56,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133371513] [2022-11-23 15:35:56,797 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:35:56,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:56,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:56,798 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:35:56,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 15:35:56,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:56,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:35:56,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:35:56,961 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-23 15:35:56,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:35:57,031 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-23 15:35:57,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133371513] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:35:57,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050492558] [2022-11-23 15:35:57,034 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:35:57,035 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:35:57,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:35:57,036 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:35:57,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:35:57,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:57,080 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:35:57,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:35:57,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:57,092 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:35:57,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:57,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:35:57,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:57,161 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:35:57,187 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:35:57,188 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 234 treesize of output 233 [2022-11-23 15:35:57,301 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 16 treesize of output 12 [2022-11-23 15:35:57,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:35:58,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1660#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:35:58,148 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:35:58,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:35:58,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-23 15:35:58,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482146396] [2022-11-23 15:35:58,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:35:58,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 15:35:58,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:35:58,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 15:35:58,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2022-11-23 15:35:58,150 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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) [2022-11-23 15:35:58,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:35:58,423 INFO L93 Difference]: Finished difference Result 126 states and 164 transitions. [2022-11-23 15:35:58,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 15:35:58,424 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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) Word has length 38 [2022-11-23 15:35:58,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:35:58,424 INFO L225 Difference]: With dead ends: 126 [2022-11-23 15:35:58,424 INFO L226 Difference]: Without dead ends: 65 [2022-11-23 15:35:58,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 79 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-23 15:35:58,426 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:35:58,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 15 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:35:58,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-23 15:35:58,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-23 15:35:58,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.3125) internal successors, (84), 64 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) [2022-11-23 15:35:58,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2022-11-23 15:35:58,439 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 38 [2022-11-23 15:35:58,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:35:58,439 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2022-11-23 15:35:58,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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) [2022-11-23 15:35:58,440 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2022-11-23 15:35:58,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 15:35:58,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:35:58,440 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:35:58,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 15:35:58,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 15:35:58,652 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:35:58,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:35:58,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1487879979, now seen corresponding path program 5 times [2022-11-23 15:35:58,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:35:58,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751072310] [2022-11-23 15:35:58,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:35:58,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:35:58,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:35:58,808 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 15:35:58,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:35:58,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751072310] [2022-11-23 15:35:58,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751072310] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:35:58,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422219778] [2022-11-23 15:35:58,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:35:58,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:35:58,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:35:58,810 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:35:58,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 15:35:58,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 15:35:58,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:35:58,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:35:58,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:35:59,002 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 15:35:59,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:35:59,098 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 15:35:59,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422219778] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:35:59,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002650470] [2022-11-23 15:35:59,100 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:35:59,100 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:35:59,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:35:59,101 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:35:59,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:35:59,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:59,145 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:35:59,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:35:59,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:59,188 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:35:59,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:35:59,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:59,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:35:59,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:35:59,263 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:35:59,287 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:35:59,288 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 234 treesize of output 233 [2022-11-23 15:35:59,363 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 16 treesize of output 12 [2022-11-23 15:35:59,606 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:36:00,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2282#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:36:00,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:36:00,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:36:00,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-23 15:36:00,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737452945] [2022-11-23 15:36:00,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:36:00,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 15:36:00,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:36:00,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 15:36:00,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-11-23 15:36:00,130 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:00,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:36:00,315 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2022-11-23 15:36:00,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 15:36:00,316 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-11-23 15:36:00,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:36:00,316 INFO L225 Difference]: With dead ends: 102 [2022-11-23 15:36:00,316 INFO L226 Difference]: Without dead ends: 49 [2022-11-23 15:36:00,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 82 SyntacticMatches, 25 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-11-23 15:36:00,317 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 166 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:36:00,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 13 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:36:00,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-23 15:36:00,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-23 15:36:00,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:00,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2022-11-23 15:36:00,325 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2022-11-23 15:36:00,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:36:00,325 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2022-11-23 15:36:00,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:00,325 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2022-11-23 15:36:00,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 15:36:00,326 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:36:00,326 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:36:00,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 15:36:00,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:00,535 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:36:00,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:36:00,535 INFO L85 PathProgramCache]: Analyzing trace with hash -2044847426, now seen corresponding path program 6 times [2022-11-23 15:36:00,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:36:00,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108899614] [2022-11-23 15:36:00,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:36:00,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:36:00,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:36:07,669 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:36:07,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:36:07,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108899614] [2022-11-23 15:36:07,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108899614] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:36:07,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344540216] [2022-11-23 15:36:07,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:36:07,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:07,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:36:07,671 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:36:07,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 15:36:07,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:36:07,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:36:07,795 WARN L261 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 138 conjunts are in the unsatisfiable core [2022-11-23 15:36:07,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:36:07,832 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 [2022-11-23 15:36:11,689 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:36:11,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:36:17,082 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 15:36:17,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344540216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:36:17,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137582981] [2022-11-23 15:36:17,084 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:36:17,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:36:17,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:36:17,085 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:36:17,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:36:17,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:17,126 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:36:17,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:36:17,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:17,168 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:36:17,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:36:17,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:17,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:36:17,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:17,248 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:36:17,271 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:36:17,272 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 234 treesize of output 233 [2022-11-23 15:36:17,368 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 16 treesize of output 12 [2022-11-23 15:36:17,625 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:36:21,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2972#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:36:21,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:36:21,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:36:21,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 39, 39] total 106 [2022-11-23 15:36:21,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229264797] [2022-11-23 15:36:21,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:36:21,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-23 15:36:21,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:36:21,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-23 15:36:21,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=11849, Unknown=0, NotChecked=0, Total=12210 [2022-11-23 15:36:21,717 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 106 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 106 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) [2022-11-23 15:36:40,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:36:40,487 INFO L93 Difference]: Finished difference Result 199 states and 249 transitions. [2022-11-23 15:36:40,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-23 15:36:40,487 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 106 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) Word has length 48 [2022-11-23 15:36:40,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:36:40,490 INFO L225 Difference]: With dead ends: 199 [2022-11-23 15:36:40,490 INFO L226 Difference]: Without dead ends: 195 [2022-11-23 15:36:40,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 36 SyntacticMatches, 44 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8565 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=1195, Invalid=26861, Unknown=0, NotChecked=0, Total=28056 [2022-11-23 15:36:40,496 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 126 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 7167 mSolverCounterSat, 758 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 7925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 758 IncrementalHoareTripleChecker+Valid, 7167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-11-23 15:36:40,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 271 Invalid, 7925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [758 Valid, 7167 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-11-23 15:36:40,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-11-23 15:36:40,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 114. [2022-11-23 15:36:40,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.2654867256637168) internal successors, (143), 113 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:40,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 143 transitions. [2022-11-23 15:36:40,541 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 143 transitions. Word has length 48 [2022-11-23 15:36:40,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:36:40,541 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 143 transitions. [2022-11-23 15:36:40,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 106 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) [2022-11-23 15:36:40,542 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 143 transitions. [2022-11-23 15:36:40,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-23 15:36:40,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:36:40,544 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:36:40,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 15:36:40,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:40,748 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:36:40,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:36:40,748 INFO L85 PathProgramCache]: Analyzing trace with hash -291235994, now seen corresponding path program 7 times [2022-11-23 15:36:40,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:36:40,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337651483] [2022-11-23 15:36:40,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:36:40,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:36:40,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:36:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-23 15:36:40,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:36:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337651483] [2022-11-23 15:36:40,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337651483] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:36:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247121961] [2022-11-23 15:36:40,933 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:36:40,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:40,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:36:40,935 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:36:40,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 15:36:41,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:36:41,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:36:41,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:36:41,151 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-23 15:36:41,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:36:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-23 15:36:41,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247121961] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:36:41,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1484496658] [2022-11-23 15:36:41,249 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:36:41,249 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:36:41,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:36:41,250 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:36:41,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:36:41,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:41,297 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:36:41,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:36:41,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:41,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:36:41,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:41,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:36:41,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:41,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:41,397 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:36:41,398 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 244 treesize of output 232 [2022-11-23 15:36:41,471 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 16 treesize of output 12 [2022-11-23 15:36:41,699 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:36:42,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4005#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:36:42,443 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:36:42,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:36:42,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-23 15:36:42,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546504723] [2022-11-23 15:36:42,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:36:42,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:36:42,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:36:42,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:36:42,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-11-23 15:36:42,444 INFO L87 Difference]: Start difference. First operand 114 states and 143 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 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) [2022-11-23 15:36:42,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:36:42,777 INFO L93 Difference]: Finished difference Result 187 states and 232 transitions. [2022-11-23 15:36:42,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 15:36:42,778 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 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 49 [2022-11-23 15:36:42,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:36:42,781 INFO L225 Difference]: With dead ends: 187 [2022-11-23 15:36:42,781 INFO L226 Difference]: Without dead ends: 85 [2022-11-23 15:36:42,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 103 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:36:42,788 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:36:42,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 13 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:36:42,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-23 15:36:42,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-11-23 15:36:42,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.25) internal successors, (105), 84 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) [2022-11-23 15:36:42,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 105 transitions. [2022-11-23 15:36:42,818 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 105 transitions. Word has length 49 [2022-11-23 15:36:42,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:36:42,818 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 105 transitions. [2022-11-23 15:36:42,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 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) [2022-11-23 15:36:42,819 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 105 transitions. [2022-11-23 15:36:42,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 15:36:42,820 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:36:42,820 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:36:42,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 15:36:43,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:43,024 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:36:43,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:36:43,024 INFO L85 PathProgramCache]: Analyzing trace with hash 242058191, now seen corresponding path program 8 times [2022-11-23 15:36:43,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:36:43,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254282858] [2022-11-23 15:36:43,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:36:43,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:36:43,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:36:43,214 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-23 15:36:43,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:36:43,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254282858] [2022-11-23 15:36:43,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254282858] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:36:43,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125286954] [2022-11-23 15:36:43,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:36:43,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:43,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:36:43,220 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:36:43,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 15:36:43,345 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 15:36:43,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:36:43,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:36:43,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:36:43,460 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-23 15:36:43,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:36:43,568 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-23 15:36:43,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125286954] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:36:43,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110296004] [2022-11-23 15:36:43,570 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:36:43,571 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:36:43,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:36:43,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:36:43,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:36:43,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:43,618 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:36:43,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:36:43,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:43,663 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:36:43,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:36:43,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:43,696 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:36:43,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:43,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:36:43,762 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:36:43,762 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 244 treesize of output 232 [2022-11-23 15:36:43,804 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 16 treesize of output 12 [2022-11-23 15:36:44,030 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:36:44,591 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4860#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:36:44,591 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:36:44,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:36:44,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-23 15:36:44,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215468943] [2022-11-23 15:36:44,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:36:44,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:36:44,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:36:44,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:36:44,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2022-11-23 15:36:44,593 INFO L87 Difference]: Start difference. First operand 85 states and 105 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:44,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:36:44,810 INFO L93 Difference]: Finished difference Result 130 states and 167 transitions. [2022-11-23 15:36:44,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 15:36:44,811 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 0 states have call successors, (0), 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 [2022-11-23 15:36:44,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:36:44,811 INFO L225 Difference]: With dead ends: 130 [2022-11-23 15:36:44,811 INFO L226 Difference]: Without dead ends: 60 [2022-11-23 15:36:44,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 110 SyntacticMatches, 29 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2022-11-23 15:36:44,813 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 153 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:36:44,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 13 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:36:44,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-23 15:36:44,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-23 15:36:44,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 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) [2022-11-23 15:36:44,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2022-11-23 15:36:44,840 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 50 [2022-11-23 15:36:44,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:36:44,841 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2022-11-23 15:36:44,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:36:44,841 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2022-11-23 15:36:44,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 15:36:44,843 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:36:44,843 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:36:44,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 15:36:45,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 15:36:45,044 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:36:45,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:36:45,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1661922165, now seen corresponding path program 9 times [2022-11-23 15:36:45,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:36:45,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241983047] [2022-11-23 15:36:45,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:36:45,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:36:45,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:36:55,543 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 2 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:36:55,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:36:55,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241983047] [2022-11-23 15:36:55,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241983047] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:36:55,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054051988] [2022-11-23 15:36:55,544 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:36:55,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:36:55,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:36:55,545 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:36:55,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 15:36:55,666 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:36:55,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:36:55,670 WARN L261 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 182 conjunts are in the unsatisfiable core [2022-11-23 15:36:55,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:36:55,722 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 [2022-11-23 15:37:02,118 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:37:02,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:37:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:37:11,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054051988] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:37:11,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509092480] [2022-11-23 15:37:11,840 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:37:11,840 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:37:11,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:37:11,840 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:37:11,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:37:11,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:11,886 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:37:11,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:37:11,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:11,929 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:37:11,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:37:11,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:11,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:37:12,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:12,007 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:37:12,031 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:37:12,032 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 234 treesize of output 233 [2022-11-23 15:37:12,122 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 16 treesize of output 12 [2022-11-23 15:37:12,364 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:37:19,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5726#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:37:19,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:37:19,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:37:19,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 50, 49] total 136 [2022-11-23 15:37:19,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571617771] [2022-11-23 15:37:19,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:37:19,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-23 15:37:19,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:37:19,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-23 15:37:19,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=19285, Unknown=0, NotChecked=0, Total=19740 [2022-11-23 15:37:19,078 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 136 states, 136 states have (on average 1.1691176470588236) internal successors, (159), 136 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:37:45,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:37:45,021 INFO L93 Difference]: Finished difference Result 142 states and 170 transitions. [2022-11-23 15:37:45,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-23 15:37:45,022 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.1691176470588236) internal successors, (159), 136 states have internal predecessors, (159), 0 states have call successors, (0), 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 [2022-11-23 15:37:45,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:37:45,023 INFO L225 Difference]: With dead ends: 142 [2022-11-23 15:37:45,023 INFO L226 Difference]: Without dead ends: 139 [2022-11-23 15:37:45,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 47 SyntacticMatches, 47 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11667 ImplicationChecksByTransitivity, 41.4s TimeCoverageRelationStatistics Valid=1182, Invalid=36260, Unknown=0, NotChecked=0, Total=37442 [2022-11-23 15:37:45,032 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 89 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 9786 mSolverCounterSat, 671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 10457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 671 IncrementalHoareTripleChecker+Valid, 9786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2022-11-23 15:37:45,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 342 Invalid, 10457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [671 Valid, 9786 Invalid, 0 Unknown, 0 Unchecked, 9.8s Time] [2022-11-23 15:37:45,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-23 15:37:45,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 82. [2022-11-23 15:37:45,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1975308641975309) internal successors, (97), 81 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) [2022-11-23 15:37:45,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2022-11-23 15:37:45,086 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 59 [2022-11-23 15:37:45,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:37:45,087 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2022-11-23 15:37:45,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.1691176470588236) internal successors, (159), 136 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:37:45,087 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2022-11-23 15:37:45,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 15:37:45,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:37:45,088 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:37:45,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 15:37:45,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 15:37:45,292 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:37:45,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:37:45,292 INFO L85 PathProgramCache]: Analyzing trace with hash -352141007, now seen corresponding path program 10 times [2022-11-23 15:37:45,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:37:45,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968192956] [2022-11-23 15:37:45,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:37:45,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:37:45,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:37:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-23 15:37:45,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:37:45,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968192956] [2022-11-23 15:37:45,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968192956] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:37:45,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678758238] [2022-11-23 15:37:45,529 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:37:45,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:37:45,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:37:45,531 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:37:45,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 15:37:45,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:37:45,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:37:45,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:37:45,777 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-23 15:37:45,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:37:45,895 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-23 15:37:45,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678758238] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:37:45,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137494646] [2022-11-23 15:37:45,901 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:37:45,901 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:37:45,902 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:37:45,902 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:37:45,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:37:45,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:45,945 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:37:45,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:37:45,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:45,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:37:45,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:45,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:37:46,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:46,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:46,039 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:37:46,039 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 244 treesize of output 232 [2022-11-23 15:37:46,082 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 16 treesize of output 12 [2022-11-23 15:37:46,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:37:46,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6643#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:37:46,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:37:46,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:37:46,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-23 15:37:46,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513359353] [2022-11-23 15:37:46,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:37:46,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 15:37:46,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:37:46,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 15:37:46,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-11-23 15:37:46,742 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:37:47,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:37:47,217 INFO L93 Difference]: Finished difference Result 204 states and 243 transitions. [2022-11-23 15:37:47,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 15:37:47,218 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 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 60 [2022-11-23 15:37:47,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:37:47,218 INFO L225 Difference]: With dead ends: 204 [2022-11-23 15:37:47,219 INFO L226 Difference]: Without dead ends: 83 [2022-11-23 15:37:47,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 148 SyntacticMatches, 20 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2022-11-23 15:37:47,220 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 47 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:37:47,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 7 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:37:47,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-23 15:37:47,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-11-23 15:37:47,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:37:47,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2022-11-23 15:37:47,290 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 60 [2022-11-23 15:37:47,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:37:47,290 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2022-11-23 15:37:47,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:37:47,291 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2022-11-23 15:37:47,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 15:37:47,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:37:47,292 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:37:47,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 15:37:47,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:37:47,499 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:37:47,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:37:47,499 INFO L85 PathProgramCache]: Analyzing trace with hash 1564125480, now seen corresponding path program 11 times [2022-11-23 15:37:47,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:37:47,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888591345] [2022-11-23 15:37:47,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:37:47,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:37:47,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:37:47,712 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-23 15:37:47,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:37:47,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888591345] [2022-11-23 15:37:47,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888591345] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:37:47,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419788113] [2022-11-23 15:37:47,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:37:47,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:37:47,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:37:47,715 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:37:47,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 15:37:47,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 15:37:47,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:37:47,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:37:47,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:37:48,000 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-23 15:37:48,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:37:48,106 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-23 15:37:48,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419788113] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:37:48,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500943358] [2022-11-23 15:37:48,107 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:37:48,108 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:37:48,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:37:48,108 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:37:48,108 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:37:48,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:48,152 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:37:48,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:37:48,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:48,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:37:48,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:48,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:37:48,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:48,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:37:48,252 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:37:48,253 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 244 treesize of output 232 [2022-11-23 15:37:48,298 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 16 treesize of output 12 [2022-11-23 15:37:48,511 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:37:49,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7603#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:37:49,253 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:37:49,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:37:49,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2022-11-23 15:37:49,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278000236] [2022-11-23 15:37:49,255 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:37:49,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 15:37:49,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:37:49,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 15:37:49,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=678, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:37:49,256 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 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) [2022-11-23 15:37:49,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:37:49,739 INFO L93 Difference]: Finished difference Result 141 states and 174 transitions. [2022-11-23 15:37:49,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 15:37:49,739 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 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 61 [2022-11-23 15:37:49,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:37:49,740 INFO L225 Difference]: With dead ends: 141 [2022-11-23 15:37:49,740 INFO L226 Difference]: Without dead ends: 71 [2022-11-23 15:37:49,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 137 SyntacticMatches, 36 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=241, Invalid=1019, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 15:37:49,741 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 256 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:37:49,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 15 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:37:49,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-23 15:37:49,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-11-23 15:37:49,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 70 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) [2022-11-23 15:37:49,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-11-23 15:37:49,785 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 61 [2022-11-23 15:37:49,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:37:49,785 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-11-23 15:37:49,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 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) [2022-11-23 15:37:49,786 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-11-23 15:37:49,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-23 15:37:49,787 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:37:49,787 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:37:49,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 15:37:49,993 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:37:49,993 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:37:49,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:37:49,994 INFO L85 PathProgramCache]: Analyzing trace with hash 458943518, now seen corresponding path program 12 times [2022-11-23 15:37:49,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:37:49,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448577488] [2022-11-23 15:37:49,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:37:49,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:37:50,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:38:04,968 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 7 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:38:04,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:38:04,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448577488] [2022-11-23 15:38:04,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448577488] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:38:04,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355317947] [2022-11-23 15:38:04,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:38:04,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:38:04,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:38:04,970 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:38:04,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 15:38:05,098 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:38:05,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:38:05,104 WARN L261 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 222 conjunts are in the unsatisfiable core [2022-11-23 15:38:05,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:38:05,150 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 [2022-11-23 15:38:15,337 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:38:15,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:38:31,574 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 15:38:31,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355317947] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:38:31,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872025112] [2022-11-23 15:38:31,576 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:38:31,576 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:38:31,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:38:31,576 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:38:31,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:38:31,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:38:31,618 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:38:31,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:38:31,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:38:31,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:38:31,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:38:31,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:38:31,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:38:31,704 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:38:31,728 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:38:31,728 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 234 treesize of output 233 [2022-11-23 15:38:31,811 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 16 treesize of output 12 [2022-11-23 15:38:32,031 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:38:40,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8620#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:38:40,343 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:38:40,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:38:40,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 61, 59] total 167 [2022-11-23 15:38:40,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815054013] [2022-11-23 15:38:40,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:38:40,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-11-23 15:38:40,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:38:40,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-11-23 15:38:40,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=28835, Unknown=0, NotChecked=0, Total=29412 [2022-11-23 15:38:40,349 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 167 states, 167 states have (on average 1.1377245508982037) internal successors, (190), 167 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:33,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:39:33,442 INFO L93 Difference]: Finished difference Result 226 states and 266 transitions. [2022-11-23 15:39:33,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-23 15:39:33,443 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 1.1377245508982037) internal successors, (190), 167 states have internal predecessors, (190), 0 states have call successors, (0), 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 [2022-11-23 15:39:33,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:39:33,444 INFO L225 Difference]: With dead ends: 226 [2022-11-23 15:39:33,445 INFO L226 Difference]: Without dead ends: 222 [2022-11-23 15:39:33,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 61 SyntacticMatches, 46 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18593 ImplicationChecksByTransitivity, 72.3s TimeCoverageRelationStatistics Valid=2035, Invalid=63245, Unknown=0, NotChecked=0, Total=65280 [2022-11-23 15:39:33,452 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 107 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 17754 mSolverCounterSat, 1348 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 19102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1348 IncrementalHoareTripleChecker+Valid, 17754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:39:33,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 406 Invalid, 19102 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1348 Valid, 17754 Invalid, 0 Unknown, 0 Unchecked, 18.7s Time] [2022-11-23 15:39:33,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-23 15:39:33,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 135. [2022-11-23 15:39:33,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.1791044776119404) internal successors, (158), 134 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:33,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 158 transitions. [2022-11-23 15:39:33,579 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 158 transitions. Word has length 70 [2022-11-23 15:39:33,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:39:33,579 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 158 transitions. [2022-11-23 15:39:33,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 1.1377245508982037) internal successors, (190), 167 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:33,580 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 158 transitions. [2022-11-23 15:39:33,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-23 15:39:33,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:39:33,581 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:39:33,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 15:39:33,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 15:39:33,782 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:39:33,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:39:33,782 INFO L85 PathProgramCache]: Analyzing trace with hash 89370822, now seen corresponding path program 13 times [2022-11-23 15:39:33,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:39:33,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810556657] [2022-11-23 15:39:33,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:39:33,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:39:33,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:39:34,047 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 15:39:34,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:39:34,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810556657] [2022-11-23 15:39:34,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810556657] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:39:34,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506526832] [2022-11-23 15:39:34,048 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:39:34,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:39:34,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:39:34,049 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:39:34,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 15:39:34,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:39:34,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 15:39:34,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:39:34,366 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 15:39:34,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:39:34,518 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 15:39:34,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506526832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:39:34,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218895464] [2022-11-23 15:39:34,520 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:39:34,520 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:39:34,520 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:39:34,521 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:39:34,521 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:39:34,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:34,560 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:39:34,560 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:39:34,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:34,598 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:39:34,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:39:34,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:34,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:39:34,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:34,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:34,689 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:39:34,690 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 244 treesize of output 232 [2022-11-23 15:39:34,736 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 16 treesize of output 12 [2022-11-23 15:39:34,971 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:39:36,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9941#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:39:36,003 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:39:36,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:39:36,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-23 15:39:36,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308535044] [2022-11-23 15:39:36,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:39:36,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 15:39:36,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:39:36,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 15:39:36,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-23 15:39:36,007 INFO L87 Difference]: Start difference. First operand 135 states and 158 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:36,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:39:36,612 INFO L93 Difference]: Finished difference Result 255 states and 297 transitions. [2022-11-23 15:39:36,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 15:39:36,612 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 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 [2022-11-23 15:39:36,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:39:36,613 INFO L225 Difference]: With dead ends: 255 [2022-11-23 15:39:36,613 INFO L226 Difference]: Without dead ends: 98 [2022-11-23 15:39:36,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 151 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 15:39:36,614 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:39:36,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 17 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:39:36,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-23 15:39:36,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2022-11-23 15:39:36,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.1649484536082475) internal successors, (113), 97 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:36,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2022-11-23 15:39:36,701 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 71 [2022-11-23 15:39:36,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:39:36,701 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2022-11-23 15:39:36,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:39:36,701 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2022-11-23 15:39:36,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-23 15:39:36,702 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:39:36,702 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:39:36,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 15:39:36,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:39:36,907 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:39:36,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:39:36,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1822689169, now seen corresponding path program 14 times [2022-11-23 15:39:36,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:39:36,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072579251] [2022-11-23 15:39:36,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:39:36,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:39:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:39:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2022-11-23 15:39:37,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:39:37,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072579251] [2022-11-23 15:39:37,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072579251] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:39:37,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708704920] [2022-11-23 15:39:37,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:39:37,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:39:37,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:39:37,132 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:39:37,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 15:39:37,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 15:39:37,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:39:37,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 15:39:37,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:39:37,586 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2022-11-23 15:39:37,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:39:37,774 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2022-11-23 15:39:37,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708704920] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:39:37,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850014667] [2022-11-23 15:39:37,775 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:39:37,776 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:39:37,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:39:37,776 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:39:37,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:39:37,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:37,819 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:39:37,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:39:37,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:37,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:39:37,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:37,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:39:37,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:37,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:39:37,916 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:39:37,917 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 244 treesize of output 232 [2022-11-23 15:39:37,959 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 16 treesize of output 12 [2022-11-23 15:39:38,186 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:39:39,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11100#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:39:39,155 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:39:39,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:39:39,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-23 15:39:39,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466075134] [2022-11-23 15:39:39,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:39:39,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 15:39:39,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:39:39,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 15:39:39,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-23 15:39:39,157 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 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) [2022-11-23 15:39:39,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:39:39,569 INFO L93 Difference]: Finished difference Result 165 states and 198 transitions. [2022-11-23 15:39:39,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 15:39:39,569 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 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 72 [2022-11-23 15:39:39,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:39:39,570 INFO L225 Difference]: With dead ends: 165 [2022-11-23 15:39:39,570 INFO L226 Difference]: Without dead ends: 82 [2022-11-23 15:39:39,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 149 SyntacticMatches, 54 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1527 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:39:39,571 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 259 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:39:39,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 13 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:39:39,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-23 15:39:39,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-11-23 15:39:39,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1358024691358024) internal successors, (92), 81 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) [2022-11-23 15:39:39,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2022-11-23 15:39:39,665 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 72 [2022-11-23 15:39:39,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:39:39,665 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2022-11-23 15:39:39,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 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) [2022-11-23 15:39:39,665 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2022-11-23 15:39:39,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-23 15:39:39,666 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:39:39,666 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:39:39,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 15:39:39,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 15:39:39,867 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:39:39,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:39:39,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1024746859, now seen corresponding path program 15 times [2022-11-23 15:39:39,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:39:39,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888787509] [2022-11-23 15:39:39,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:39:39,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:39:40,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:00,730 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 12 proven. 219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:40:00,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:00,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888787509] [2022-11-23 15:40:00,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888787509] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:40:00,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362030102] [2022-11-23 15:40:00,731 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:40:00,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:00,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:00,732 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:40:00,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:40:00,891 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:40:00,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:40:00,898 WARN L261 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 266 conjunts are in the unsatisfiable core [2022-11-23 15:40:00,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:40:01,086 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 [2022-11-23 15:40:16,749 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:40:16,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:40:41,780 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 15:40:41,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362030102] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:40:41,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856420863] [2022-11-23 15:40:41,782 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:40:41,782 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:40:41,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:40:41,783 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:40:41,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:40:41,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:40:41,830 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:40:41,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:40:41,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:40:41,866 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:40:41,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:40:41,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:40:41,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:40:41,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:40:41,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:40:41,961 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:40:41,961 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 244 treesize of output 232 [2022-11-23 15:40:42,006 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 16 treesize of output 12 [2022-11-23 15:40:42,207 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:40:59,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12279#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:40:59,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:40:59,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:40:59,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 72, 69] total 199 [2022-11-23 15:40:59,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736233995] [2022-11-23 15:40:59,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:40:59,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-11-23 15:40:59,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:59,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-11-23 15:40:59,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=670, Invalid=40742, Unknown=0, NotChecked=0, Total=41412 [2022-11-23 15:40:59,109 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand has 199 states, 199 states have (on average 1.1155778894472361) internal successors, (222), 199 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:42:04,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:42:04,388 INFO L93 Difference]: Finished difference Result 330 states and 386 transitions. [2022-11-23 15:42:04,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2022-11-23 15:42:04,389 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 1.1155778894472361) internal successors, (222), 199 states have internal predecessors, (222), 0 states have call successors, (0), 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 81 [2022-11-23 15:42:04,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:42:04,390 INFO L225 Difference]: With dead ends: 330 [2022-11-23 15:42:04,390 INFO L226 Difference]: Without dead ends: 326 [2022-11-23 15:42:04,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 52 SyntacticMatches, 67 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26317 ImplicationChecksByTransitivity, 104.4s TimeCoverageRelationStatistics Valid=2335, Invalid=80897, Unknown=0, NotChecked=0, Total=83232 [2022-11-23 15:42:04,393 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 95 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 20748 mSolverCounterSat, 1318 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 22066 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1318 IncrementalHoareTripleChecker+Valid, 20748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:42:04,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 501 Invalid, 22066 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1318 Valid, 20748 Invalid, 0 Unknown, 0 Unchecked, 23.7s Time] [2022-11-23 15:42:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-11-23 15:42:04,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 191. [2022-11-23 15:42:04,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.1526315789473685) internal successors, (219), 190 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:42:04,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 219 transitions. [2022-11-23 15:42:04,676 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 219 transitions. Word has length 81 [2022-11-23 15:42:04,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:42:04,676 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 219 transitions. [2022-11-23 15:42:04,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 1.1155778894472361) internal successors, (222), 199 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:42:04,677 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 219 transitions. [2022-11-23 15:42:04,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-23 15:42:04,678 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:42:04,678 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:42:04,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 15:42:04,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 15:42:04,879 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:42:04,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:42:04,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1282657873, now seen corresponding path program 16 times [2022-11-23 15:42:04,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:42:04,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198043528] [2022-11-23 15:42:04,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:42:04,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:42:04,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:42:05,204 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-23 15:42:05,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:42:05,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198043528] [2022-11-23 15:42:05,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198043528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:42:05,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036377752] [2022-11-23 15:42:05,204 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:42:05,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:42:05,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:42:05,208 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:42:05,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:42:05,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:42:05,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:42:05,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:42:05,569 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-23 15:42:05,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:42:05,735 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-23 15:42:05,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036377752] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:42:05,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277890379] [2022-11-23 15:42:05,737 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:42:05,737 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:42:05,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:42:05,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:42:05,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:42:05,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:05,784 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:42:05,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:42:05,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:05,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:42:05,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:05,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:42:05,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:05,860 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:42:05,882 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:42:05,883 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 234 treesize of output 233 [2022-11-23 15:42:05,952 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 16 treesize of output 12 [2022-11-23 15:42:06,167 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:42:07,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13988#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:42:07,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:42:07,215 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:42:07,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-11-23 15:42:07,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016323164] [2022-11-23 15:42:07,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:42:07,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 15:42:07,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:42:07,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 15:42:07,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2022-11-23 15:42:07,216 INFO L87 Difference]: Start difference. First operand 191 states and 219 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 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) [2022-11-23 15:42:08,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:42:08,057 INFO L93 Difference]: Finished difference Result 315 states and 359 transitions. [2022-11-23 15:42:08,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 15:42:08,058 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 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) Word has length 82 [2022-11-23 15:42:08,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:42:08,058 INFO L225 Difference]: With dead ends: 315 [2022-11-23 15:42:08,059 INFO L226 Difference]: Without dead ends: 141 [2022-11-23 15:42:08,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 182 SyntacticMatches, 50 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=284, Invalid=1122, Unknown=0, NotChecked=0, Total=1406 [2022-11-23 15:42:08,060 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:42:08,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 11 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:42:08,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-23 15:42:08,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2022-11-23 15:42:08,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.1428571428571428) internal successors, (160), 140 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:42:08,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 160 transitions. [2022-11-23 15:42:08,247 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 160 transitions. Word has length 82 [2022-11-23 15:42:08,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:42:08,247 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 160 transitions. [2022-11-23 15:42:08,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 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) [2022-11-23 15:42:08,247 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 160 transitions. [2022-11-23 15:42:08,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-23 15:42:08,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:42:08,248 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:42:08,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 15:42:08,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:42:08,455 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:42:08,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:42:08,455 INFO L85 PathProgramCache]: Analyzing trace with hash -2104536312, now seen corresponding path program 17 times [2022-11-23 15:42:08,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:42:08,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168618846] [2022-11-23 15:42:08,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:42:08,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:42:08,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:42:08,695 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-23 15:42:08,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:42:08,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168618846] [2022-11-23 15:42:08,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168618846] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:42:08,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223979430] [2022-11-23 15:42:08,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:42:08,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:42:08,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:42:08,696 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:42:08,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 15:42:08,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 15:42:08,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:42:08,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:42:08,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:42:09,143 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-23 15:42:09,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:42:09,395 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-23 15:42:09,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223979430] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:42:09,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107411722] [2022-11-23 15:42:09,396 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:42:09,396 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:42:09,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:42:09,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:42:09,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:42:09,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:09,438 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:42:09,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:42:09,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:09,475 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:42:09,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:42:09,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:09,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:42:09,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:42:09,539 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:42:09,561 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:42:09,562 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 234 treesize of output 233 [2022-11-23 15:42:09,636 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 16 treesize of output 12 [2022-11-23 15:42:09,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:42:11,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15437#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:42:11,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:42:11,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:42:11,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2022-11-23 15:42:11,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005124759] [2022-11-23 15:42:11,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:42:11,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-23 15:42:11,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:42:11,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-23 15:42:11,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1645, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 15:42:11,528 INFO L87 Difference]: Start difference. First operand 141 states and 160 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 39 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) [2022-11-23 15:42:12,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:42:12,245 INFO L93 Difference]: Finished difference Result 210 states and 246 transitions. [2022-11-23 15:42:12,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 15:42:12,245 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 39 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 83 [2022-11-23 15:42:12,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:42:12,246 INFO L225 Difference]: With dead ends: 210 [2022-11-23 15:42:12,246 INFO L226 Difference]: Without dead ends: 93 [2022-11-23 15:42:12,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 180 SyntacticMatches, 50 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2273 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=420, Invalid=2336, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 15:42:12,247 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 287 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 243 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 243 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:42:12,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 23 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [243 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:42:12,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-23 15:42:12,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-11-23 15:42:12,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1195652173913044) internal successors, (103), 92 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:42:12,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2022-11-23 15:42:12,370 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 83 [2022-11-23 15:42:12,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:42:12,371 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2022-11-23 15:42:12,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 39 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) [2022-11-23 15:42:12,371 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2022-11-23 15:42:12,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-23 15:42:12,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:42:12,372 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:42:12,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-23 15:42:12,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:42:12,572 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:42:12,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:42:12,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1461347710, now seen corresponding path program 18 times [2022-11-23 15:42:12,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:42:12,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826086071] [2022-11-23 15:42:12,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:42:12,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:42:13,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:42:38,617 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 40 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:42:38,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:42:38,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826086071] [2022-11-23 15:42:38,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826086071] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:42:38,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482809008] [2022-11-23 15:42:38,618 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:42:38,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:42:38,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:42:38,625 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:42:38,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 15:42:38,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:42:38,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:42:38,795 WARN L261 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 306 conjunts are in the unsatisfiable core [2022-11-23 15:42:38,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:42:38,994 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 [2022-11-23 15:42:53,674 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:42:53,676 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:42:53,676 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 31 treesize of output 14 [2022-11-23 15:42:54,027 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:42:54,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:43:26,571 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:43:26,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482809008] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:43:26,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648033135] [2022-11-23 15:43:26,573 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:43:26,573 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:43:26,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:43:26,573 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:43:26,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:43:26,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:43:26,612 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:43:26,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:43:26,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:43:26,647 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:43:26,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:43:26,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:43:26,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:43:26,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:43:26,711 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:43:26,734 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:43:26,734 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 234 treesize of output 233 [2022-11-23 15:43:26,809 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 16 treesize of output 12 [2022-11-23 15:43:27,012 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:43:44,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16812#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:43:44,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:43:44,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:43:44,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 83, 79] total 205 [2022-11-23 15:43:44,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393208389] [2022-11-23 15:43:44,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:43:44,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2022-11-23 15:43:44,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:43:44,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2022-11-23 15:43:44,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=716, Invalid=43174, Unknown=0, NotChecked=0, Total=43890 [2022-11-23 15:43:44,685 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 205 states, 205 states have (on average 1.1073170731707318) internal successors, (227), 205 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:44:43,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:44:43,174 INFO L93 Difference]: Finished difference Result 268 states and 301 transitions. [2022-11-23 15:44:43,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-11-23 15:44:43,175 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 1.1073170731707318) internal successors, (227), 205 states have internal predecessors, (227), 0 states have call successors, (0), 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 92 [2022-11-23 15:44:43,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:44:43,177 INFO L225 Difference]: With dead ends: 268 [2022-11-23 15:44:43,177 INFO L226 Difference]: Without dead ends: 264 [2022-11-23 15:44:43,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 75 SyntacticMatches, 82 SemanticMatches, 278 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23511 ImplicationChecksByTransitivity, 105.6s TimeCoverageRelationStatistics Valid=2022, Invalid=76098, Unknown=0, NotChecked=0, Total=78120 [2022-11-23 15:44:43,180 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 73 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 21978 mSolverCounterSat, 1082 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 23060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1082 IncrementalHoareTripleChecker+Valid, 21978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:44:43,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 261 Invalid, 23060 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1082 Valid, 21978 Invalid, 0 Unknown, 0 Unchecked, 24.9s Time] [2022-11-23 15:44:43,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-11-23 15:44:43,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 217. [2022-11-23 15:44:43,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.1342592592592593) internal successors, (245), 216 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) [2022-11-23 15:44:43,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 245 transitions. [2022-11-23 15:44:43,584 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 245 transitions. Word has length 92 [2022-11-23 15:44:43,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:44:43,584 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 245 transitions. [2022-11-23 15:44:43,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 1.1073170731707318) internal successors, (227), 205 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:44:43,585 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 245 transitions. [2022-11-23 15:44:43,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-11-23 15:44:43,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:44:43,586 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:44:43,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 15:44:43,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:44:43,793 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:44:43,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:44:43,793 INFO L85 PathProgramCache]: Analyzing trace with hash -177352154, now seen corresponding path program 19 times [2022-11-23 15:44:43,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:44:43,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232873823] [2022-11-23 15:44:43,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:44:43,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:44:43,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:44:44,133 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2022-11-23 15:44:44,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:44:44,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232873823] [2022-11-23 15:44:44,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232873823] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:44:44,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368225054] [2022-11-23 15:44:44,134 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:44:44,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:44:44,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:44:44,135 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:44:44,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 15:44:44,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:44:44,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:44:44,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:44:44,523 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2022-11-23 15:44:44,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:44:44,716 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2022-11-23 15:44:44,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368225054] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:44:44,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355461204] [2022-11-23 15:44:44,717 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:44:44,718 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:44:44,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:44:44,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:44:44,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:44:44,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:44,758 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:44:44,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:44:44,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:44,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:44:44,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:44,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:44:44,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:44,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:44,848 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:44:44,849 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 244 treesize of output 232 [2022-11-23 15:44:44,891 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 16 treesize of output 12 [2022-11-23 15:44:45,092 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:44:46,563 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18494#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:44:46,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:44:46,564 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:44:46,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-23 15:44:46,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948592035] [2022-11-23 15:44:46,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:44:46,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-23 15:44:46,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:44:46,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-23 15:44:46,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 15:44:46,566 INFO L87 Difference]: Start difference. First operand 217 states and 245 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 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) [2022-11-23 15:44:47,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:44:47,654 INFO L93 Difference]: Finished difference Result 358 states and 402 transitions. [2022-11-23 15:44:47,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 15:44:47,654 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2022-11-23 15:44:47,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:44:47,655 INFO L225 Difference]: With dead ends: 358 [2022-11-23 15:44:47,655 INFO L226 Difference]: Without dead ends: 160 [2022-11-23 15:44:47,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 199 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 15:44:47,657 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 45 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:44:47,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 15 Invalid, 869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:44:47,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-23 15:44:47,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2022-11-23 15:44:47,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.1257861635220126) internal successors, (179), 159 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:44:47,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 179 transitions. [2022-11-23 15:44:47,917 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 179 transitions. Word has length 93 [2022-11-23 15:44:47,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:44:47,918 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 179 transitions. [2022-11-23 15:44:47,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 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) [2022-11-23 15:44:47,918 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 179 transitions. [2022-11-23 15:44:47,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-23 15:44:47,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:44:47,918 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:44:47,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 15:44:48,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-23 15:44:48,119 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:44:48,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:44:48,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1600867006, now seen corresponding path program 20 times [2022-11-23 15:44:48,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:44:48,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485783347] [2022-11-23 15:44:48,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:44:48,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:44:48,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:44:48,439 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-23 15:44:48,439 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:44:48,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485783347] [2022-11-23 15:44:48,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485783347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:44:48,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466669434] [2022-11-23 15:44:48,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:44:48,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:44:48,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:44:48,441 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:44:48,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 15:44:48,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 15:44:48,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:44:48,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:44:48,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:44:48,829 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-23 15:44:48,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:44:49,011 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-23 15:44:49,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466669434] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:44:49,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176762623] [2022-11-23 15:44:49,013 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:44:49,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:44:49,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:44:49,014 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:44:49,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:44:49,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:49,053 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:44:49,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:44:49,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:49,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:44:49,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:49,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:44:49,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:44:49,135 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:44:49,159 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:44:49,160 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 234 treesize of output 233 [2022-11-23 15:44:49,230 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 16 treesize of output 12 [2022-11-23 15:44:49,438 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:44:50,486 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20125#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:44:50,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:44:50,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:44:50,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-23 15:44:50,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427669604] [2022-11-23 15:44:50,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:44:50,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-23 15:44:50,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:44:50,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-23 15:44:50,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 15:44:50,489 INFO L87 Difference]: Start difference. First operand 160 states and 179 transitions. Second operand has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 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) [2022-11-23 15:44:51,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:44:51,114 INFO L93 Difference]: Finished difference Result 237 states and 273 transitions. [2022-11-23 15:44:51,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 15:44:51,115 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 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) Word has length 94 [2022-11-23 15:44:51,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:44:51,116 INFO L225 Difference]: With dead ends: 237 [2022-11-23 15:44:51,116 INFO L226 Difference]: Without dead ends: 104 [2022-11-23 15:44:51,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 211 SyntacticMatches, 56 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2096 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 15:44:51,118 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 242 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:44:51,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 15 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:44:51,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-23 15:44:51,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2022-11-23 15:44:51,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 103 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:44:51,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 114 transitions. [2022-11-23 15:44:51,286 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 114 transitions. Word has length 94 [2022-11-23 15:44:51,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:44:51,286 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 114 transitions. [2022-11-23 15:44:51,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 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) [2022-11-23 15:44:51,286 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 114 transitions. [2022-11-23 15:44:51,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-23 15:44:51,287 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:44:51,287 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:44:51,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 15:44:51,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 15:44:51,494 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:44:51,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:44:51,494 INFO L85 PathProgramCache]: Analyzing trace with hash -650780235, now seen corresponding path program 21 times [2022-11-23 15:44:51,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:44:51,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201774003] [2022-11-23 15:44:51,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:44:51,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:44:52,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:45:27,295 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 46 proven. 350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:45:27,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:45:27,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201774003] [2022-11-23 15:45:27,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201774003] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:45:27,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839639180] [2022-11-23 15:45:27,297 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:45:27,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:45:27,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:45:27,311 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:45:27,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 15:45:27,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:45:27,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:45:27,543 WARN L261 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 350 conjunts are in the unsatisfiable core [2022-11-23 15:45:27,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:45:28,199 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 [2022-11-23 15:45:47,172 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:45:47,174 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:45:47,175 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 31 treesize of output 14 [2022-11-23 15:45:47,556 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:45:47,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:46:31,599 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:46:31,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839639180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:46:31,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1772081850] [2022-11-23 15:46:31,602 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:46:31,602 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:46:31,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:46:31,603 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:46:31,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:46:31,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:46:31,645 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:46:31,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:46:31,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:46:31,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:46:31,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:46:31,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:46:31,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:46:31,719 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:46:31,741 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:46:31,742 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 234 treesize of output 233 [2022-11-23 15:46:31,811 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 16 treesize of output 12 [2022-11-23 15:46:32,018 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:46:46,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21662#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:46:46,113 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:46:46,113 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:46:46,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 94, 89] total 233 [2022-11-23 15:46:46,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781931695] [2022-11-23 15:46:46,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:46:46,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 233 states [2022-11-23 15:46:46,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:46:46,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 233 interpolants. [2022-11-23 15:46:46,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=875, Invalid=55531, Unknown=0, NotChecked=0, Total=56406 [2022-11-23 15:46:46,120 INFO L87 Difference]: Start difference. First operand 104 states and 114 transitions. Second operand has 233 states, 233 states have (on average 1.094420600858369) internal successors, (255), 233 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:19,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:48:19,004 INFO L93 Difference]: Finished difference Result 406 states and 456 transitions. [2022-11-23 15:48:19,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 168 states. [2022-11-23 15:48:19,005 INFO L78 Accepts]: Start accepts. Automaton has has 233 states, 233 states have (on average 1.094420600858369) internal successors, (255), 233 states have internal predecessors, (255), 0 states have call successors, (0), 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 [2022-11-23 15:48:19,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:48:19,007 INFO L225 Difference]: With dead ends: 406 [2022-11-23 15:48:19,007 INFO L226 Difference]: Without dead ends: 402 [2022-11-23 15:48:19,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 111 SyntacticMatches, 62 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31369 ImplicationChecksByTransitivity, 142.1s TimeCoverageRelationStatistics Valid=2904, Invalid=108318, Unknown=0, NotChecked=0, Total=111222 [2022-11-23 15:48:19,011 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 93 mSDsluCounter, 594 mSDsCounter, 0 mSdLazyCounter, 30665 mSolverCounterSat, 1332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 31997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 1332 IncrementalHoareTripleChecker+Valid, 30665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:48:19,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 599 Invalid, 31997 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [1332 Valid, 30665 Invalid, 0 Unknown, 0 Unchecked, 37.9s Time] [2022-11-23 15:48:19,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2022-11-23 15:48:19,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 244. [2022-11-23 15:48:19,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.123456790123457) internal successors, (273), 243 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:19,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 273 transitions. [2022-11-23 15:48:19,468 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 273 transitions. Word has length 103 [2022-11-23 15:48:19,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:48:19,468 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 273 transitions. [2022-11-23 15:48:19,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 233 states, 233 states have (on average 1.094420600858369) internal successors, (255), 233 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:19,468 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 273 transitions. [2022-11-23 15:48:19,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-23 15:48:19,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:48:19,469 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:48:19,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 15:48:19,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:48:19,670 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:48:19,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:48:19,670 INFO L85 PathProgramCache]: Analyzing trace with hash -2141023375, now seen corresponding path program 22 times [2022-11-23 15:48:19,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:48:19,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012670366] [2022-11-23 15:48:19,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:48:19,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:48:19,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:48:20,058 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-23 15:48:20,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:48:20,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012670366] [2022-11-23 15:48:20,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012670366] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:48:20,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629982312] [2022-11-23 15:48:20,059 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:48:20,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:48:20,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:48:20,060 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:48:20,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 15:48:20,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:48:20,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:48:20,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:48:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-23 15:48:20,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:48:20,757 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-23 15:48:20,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629982312] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:48:20,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1653559699] [2022-11-23 15:48:20,759 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:48:20,759 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:48:20,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:48:20,759 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:48:20,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:48:20,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:20,801 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:48:20,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:48:20,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:20,839 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:48:20,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:48:20,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:20,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:48:20,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:20,914 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:48:20,939 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:48:20,940 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 234 treesize of output 233 [2022-11-23 15:48:21,016 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 16 treesize of output 12 [2022-11-23 15:48:21,213 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:48:22,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23792#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:48:22,455 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:48:22,455 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:48:22,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-23 15:48:22,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247200835] [2022-11-23 15:48:22,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:48:22,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 15:48:22,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:48:22,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 15:48:22,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:48:22,457 INFO L87 Difference]: Start difference. First operand 244 states and 273 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:23,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:48:23,762 INFO L93 Difference]: Finished difference Result 402 states and 447 transitions. [2022-11-23 15:48:23,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 15:48:23,762 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 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 104 [2022-11-23 15:48:23,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:48:23,763 INFO L225 Difference]: With dead ends: 402 [2022-11-23 15:48:23,764 INFO L226 Difference]: Without dead ends: 180 [2022-11-23 15:48:23,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 250 SyntacticMatches, 46 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1680 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 15:48:23,765 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:48:23,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 11 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:48:23,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-23 15:48:24,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2022-11-23 15:48:24,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 179 states have (on average 1.1173184357541899) internal successors, (200), 179 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:24,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 200 transitions. [2022-11-23 15:48:24,077 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 200 transitions. Word has length 104 [2022-11-23 15:48:24,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:48:24,077 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 200 transitions. [2022-11-23 15:48:24,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:24,078 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 200 transitions. [2022-11-23 15:48:24,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-11-23 15:48:24,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:48:24,078 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:48:24,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 15:48:24,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:48:24,279 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:48:24,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:48:24,279 INFO L85 PathProgramCache]: Analyzing trace with hash -55073560, now seen corresponding path program 23 times [2022-11-23 15:48:24,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:48:24,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004607947] [2022-11-23 15:48:24,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:48:24,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:48:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:48:24,724 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2022-11-23 15:48:24,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:48:24,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004607947] [2022-11-23 15:48:24,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004607947] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:48:24,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681483005] [2022-11-23 15:48:24,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:48:24,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:48:24,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:48:24,731 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:48:24,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 15:48:25,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:48:25,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:48:25,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:48:25,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:48:25,315 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2022-11-23 15:48:25,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:48:25,529 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2022-11-23 15:48:25,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681483005] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:48:25,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1771550517] [2022-11-23 15:48:25,530 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 15:48:25,531 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:48:25,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:48:25,531 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:48:25,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:48:25,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:25,583 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:48:25,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:48:25,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:25,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:48:25,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:25,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-23 15:48:25,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:25,655 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:48:25,678 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:48:25,678 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 234 treesize of output 233 [2022-11-23 15:48:25,754 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 16 treesize of output 12 [2022-11-23 15:48:25,954 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:48:27,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25622#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:48:27,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:48:27,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:48:27,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-23 15:48:27,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894056084] [2022-11-23 15:48:27,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:48:27,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 15:48:27,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:48:27,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 15:48:27,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:48:27,432 INFO L87 Difference]: Start difference. First operand 180 states and 200 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 32 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:28,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:48:28,202 INFO L93 Difference]: Finished difference Result 265 states and 302 transitions. [2022-11-23 15:48:28,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 15:48:28,202 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 32 states have internal predecessors, (67), 0 states have call successors, (0), 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 105 [2022-11-23 15:48:28,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:48:28,203 INFO L225 Difference]: With dead ends: 265 [2022-11-23 15:48:28,203 INFO L226 Difference]: Without dead ends: 115 [2022-11-23 15:48:28,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 226 SyntacticMatches, 73 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=519, Invalid=1643, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 15:48:28,204 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 366 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:48:28,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 13 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:48:28,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-23 15:48:28,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-11-23 15:48:28,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0964912280701755) internal successors, (125), 114 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) [2022-11-23 15:48:28,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 125 transitions. [2022-11-23 15:48:28,389 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 125 transitions. Word has length 105 [2022-11-23 15:48:28,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:48:28,389 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 125 transitions. [2022-11-23 15:48:28,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 32 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:48:28,389 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 125 transitions. [2022-11-23 15:48:28,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-23 15:48:28,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:48:28,390 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:48:28,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 15:48:28,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-23 15:48:28,597 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:48:28,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:48:28,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1890485982, now seen corresponding path program 24 times [2022-11-23 15:48:28,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:48:28,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486498413] [2022-11-23 15:48:28,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:48:28,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:48:29,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:49:07,963 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 51 proven. 444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:49:07,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:49:07,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486498413] [2022-11-23 15:49:07,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486498413] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:49:07,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863823129] [2022-11-23 15:49:07,964 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:49:07,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:49:07,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:49:07,965 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:49:07,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23834b53-1dd7-4cc9-a9cf-eb5eeee555a0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 15:49:08,172 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:49:08,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:49:08,180 WARN L261 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 390 conjunts are in the unsatisfiable core [2022-11-23 15:49:08,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:49:08,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9