./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/rewnifrev2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/rewnifrev2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS --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 a70897b8f9d01ade64d517ee2bf20dd64d1adb0a94ea95e1a8b2431f33b62533 --- 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-8393723 [2022-11-19 06:49:35,297 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:49:35,299 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:49:35,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:49:35,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:49:35,331 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:49:35,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:49:35,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:49:35,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:49:35,347 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:49:35,348 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:49:35,350 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:49:35,351 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:49:35,354 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:49:35,356 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:49:35,358 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:49:35,359 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:49:35,364 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:49:35,366 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:49:35,368 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:49:35,371 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:49:35,373 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:49:35,375 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:49:35,376 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:49:35,384 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:49:35,388 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:49:35,388 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:49:35,389 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:49:35,390 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:49:35,391 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:49:35,392 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:49:35,393 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:49:35,394 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:49:35,396 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:49:35,397 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:49:35,398 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:49:35,399 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:49:35,400 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:49:35,400 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:49:35,401 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:49:35,401 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:49:35,402 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:49:35,444 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:49:35,444 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:49:35,445 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:49:35,445 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:49:35,446 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:49:35,447 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:49:35,447 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:49:35,447 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:49:35,447 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:49:35,447 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:49:35,448 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:49:35,449 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:49:35,449 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:49:35,449 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:49:35,449 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:49:35,450 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:49:35,450 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:49:35,450 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:49:35,451 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:49:35,451 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:49:35,451 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:49:35,451 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:49:35,451 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:49:35,452 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:49:35,452 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:49:35,452 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:49:35,452 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:49:35,453 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:49:35,453 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:49:35,453 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:49:35,453 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:49:35,454 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:49:35,454 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:49:35,454 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:49:35,454 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:49:35,454 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:49:35,455 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:49:35,455 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:49:35,455 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:49:35,455 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:49:35,455 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:49:35,456 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_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a70897b8f9d01ade64d517ee2bf20dd64d1adb0a94ea95e1a8b2431f33b62533 [2022-11-19 06:49:35,783 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:49:35,821 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:49:35,824 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:49:35,825 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:49:35,828 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:49:35,829 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/array-tiling/rewnifrev2.c [2022-11-19 06:49:35,911 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/data/914aea5c6/664847126914480287ef6804239e90a7/FLAG015d9becf [2022-11-19 06:49:36,447 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:49:36,447 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/sv-benchmarks/c/array-tiling/rewnifrev2.c [2022-11-19 06:49:36,454 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/data/914aea5c6/664847126914480287ef6804239e90a7/FLAG015d9becf [2022-11-19 06:49:36,811 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/data/914aea5c6/664847126914480287ef6804239e90a7 [2022-11-19 06:49:36,813 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:49:36,814 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:49:36,816 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:49:36,816 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:49:36,820 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:49:36,821 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:49:36" (1/1) ... [2022-11-19 06:49:36,822 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@749bff36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:36, skipping insertion in model container [2022-11-19 06:49:36,823 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:49:36" (1/1) ... [2022-11-19 06:49:36,830 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:49:36,844 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:49:37,029 WARN L234 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_a83be1bf-9582-48ee-9da6-8cb49668373a/sv-benchmarks/c/array-tiling/rewnifrev2.c[401,414] [2022-11-19 06:49:37,044 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:49:37,053 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:49:37,065 WARN L234 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_a83be1bf-9582-48ee-9da6-8cb49668373a/sv-benchmarks/c/array-tiling/rewnifrev2.c[401,414] [2022-11-19 06:49:37,070 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:49:37,084 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:49:37,084 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37 WrapperNode [2022-11-19 06:49:37,085 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:49:37,086 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:49:37,086 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:49:37,086 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:49:37,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,100 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,117 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-11-19 06:49:37,117 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:49:37,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:49:37,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:49:37,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:49:37,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,129 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,129 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,133 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,137 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,138 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,139 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,141 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:49:37,141 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:49:37,142 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:49:37,142 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:49:37,143 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (1/1) ... [2022-11-19 06:49:37,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:49:37,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:37,172 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:49:37,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:49:37,229 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:49:37,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:49:37,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 06:49:37,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-19 06:49:37,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:49:37,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:49:37,231 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 06:49:37,303 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:49:37,305 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:49:37,431 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:49:37,456 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:49:37,456 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 06:49:37,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:49:37 BoogieIcfgContainer [2022-11-19 06:49:37,459 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:49:37,461 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:49:37,461 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:49:37,465 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:49:37,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:49:36" (1/3) ... [2022-11-19 06:49:37,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11edec6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:49:37, skipping insertion in model container [2022-11-19 06:49:37,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:49:37" (2/3) ... [2022-11-19 06:49:37,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11edec6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:49:37, skipping insertion in model container [2022-11-19 06:49:37,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:49:37" (3/3) ... [2022-11-19 06:49:37,468 INFO L112 eAbstractionObserver]: Analyzing ICFG rewnifrev2.c [2022-11-19 06:49:37,487 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:49:37,488 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:49:37,586 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:49:37,598 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;@6b22f0d1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:49:37,608 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:49:37,625 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:37,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 06:49:37,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:37,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 06:49:37,633 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:37,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:37,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1912434953, now seen corresponding path program 1 times [2022-11-19 06:49:37,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:37,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429604155] [2022-11-19 06:49:37,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:37,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:37,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:37,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:37,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:37,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429604155] [2022-11-19 06:49:37,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429604155] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:49:37,973 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:49:37,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:49:37,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342595522] [2022-11-19 06:49:37,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:49:37,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:49:37,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:38,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:49:38,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 06:49:38,024 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:38,098 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2022-11-19 06:49:38,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:49:38,101 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-19 06:49:38,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:38,116 INFO L225 Difference]: With dead ends: 20 [2022-11-19 06:49:38,117 INFO L226 Difference]: Without dead ends: 9 [2022-11-19 06:49:38,120 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 [2022-11-19 06:49:38,127 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:38,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:49:38,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-19 06:49:38,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-19 06:49:38,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-19 06:49:38,167 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2022-11-19 06:49:38,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:38,167 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-19 06:49:38,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,168 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-19 06:49:38,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 06:49:38,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:38,169 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:49:38,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:49:38,169 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:38,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:38,170 INFO L85 PathProgramCache]: Analyzing trace with hash 840302022, now seen corresponding path program 1 times [2022-11-19 06:49:38,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:38,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016447476] [2022-11-19 06:49:38,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:38,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:38,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:38,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:38,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016447476] [2022-11-19 06:49:38,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016447476] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:49:38,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:49:38,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 06:49:38,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896503260] [2022-11-19 06:49:38,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:49:38,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 06:49:38,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:38,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 06:49:38,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:49:38,638 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:38,729 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2022-11-19 06:49:38,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 06:49:38,730 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-19 06:49:38,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:38,732 INFO L225 Difference]: With dead ends: 14 [2022-11-19 06:49:38,732 INFO L226 Difference]: Without dead ends: 12 [2022-11-19 06:49:38,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-19 06:49:38,738 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:38,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 8 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:49:38,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-19 06:49:38,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2022-11-19 06:49:38,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-19 06:49:38,743 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2022-11-19 06:49:38,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:38,744 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-19 06:49:38,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:38,744 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-19 06:49:38,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 06:49:38,745 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:38,745 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:49:38,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 06:49:38,745 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:38,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:38,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1921650230, now seen corresponding path program 1 times [2022-11-19 06:49:38,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:38,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638013747] [2022-11-19 06:49:38,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:38,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:38,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:39,005 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:39,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:39,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638013747] [2022-11-19 06:49:39,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638013747] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:39,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560524339] [2022-11-19 06:49:39,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:39,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:39,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:39,010 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:39,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:49:39,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:39,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 06:49:39,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:39,226 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 23 treesize of output 24 [2022-11-19 06:49:39,607 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-19 06:49:39,608 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 24 treesize of output 12 [2022-11-19 06:49:39,644 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:39,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:39,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:39,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560524339] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:49:39,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1677077718] [2022-11-19 06:49:39,866 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 06:49:39,866 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:39,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:49:39,875 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:49:39,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:49:40,025 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 06:49:40,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-19 06:49:40,150 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:49:40,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:49:40,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 49 [2022-11-19 06:49:40,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:40,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:40,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:40,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:40,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:40,379 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-19 06:49:40,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 276 treesize of output 268 [2022-11-19 06:49:40,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 29 [2022-11-19 06:49:40,721 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:49:41,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '167#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2022-11-19 06:49:41,234 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:49:41,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:49:41,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 15 [2022-11-19 06:49:41,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957467681] [2022-11-19 06:49:41,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:41,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 06:49:41,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:41,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 06:49:41,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:49:41,237 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:41,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:41,501 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-11-19 06:49:41,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 06:49:41,502 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 06:49:41,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:41,502 INFO L225 Difference]: With dead ends: 18 [2022-11-19 06:49:41,502 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 06:49:41,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=155, Invalid=601, Unknown=0, NotChecked=0, Total=756 [2022-11-19 06:49:41,504 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:41,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 15 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 32 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2022-11-19 06:49:41,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 06:49:41,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2022-11-19 06:49:41,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2022-11-19 06:49:41,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-19 06:49:41,509 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-11-19 06:49:41,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:41,510 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-19 06:49:41,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:41,510 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-19 06:49:41,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 06:49:41,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:41,511 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-19 06:49:41,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:49:41,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:41,712 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:41,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:41,713 INFO L85 PathProgramCache]: Analyzing trace with hash -257732794, now seen corresponding path program 2 times [2022-11-19 06:49:41,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:41,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495741991] [2022-11-19 06:49:41,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:41,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:41,831 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:41,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:41,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495741991] [2022-11-19 06:49:41,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495741991] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:41,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300547069] [2022-11-19 06:49:41,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:49:41,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:41,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:41,834 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:41,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:49:41,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:49:41,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:49:41,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 06:49:41,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:42,048 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:42,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:42,111 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:42,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300547069] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:49:42,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609234990] [2022-11-19 06:49:42,114 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 06:49:42,114 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:42,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:49:42,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:49:42,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:49:42,212 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:49:42,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:49:42,230 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 [2022-11-19 06:49:42,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 49 [2022-11-19 06:49:42,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:42,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:42,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:42,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:42,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:42,414 INFO L321 Elim1Store]: treesize reduction 226, result has 11.7 percent of original size [2022-11-19 06:49:42,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 276 treesize of output 278 [2022-11-19 06:49:42,517 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2022-11-19 06:49:42,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 29 [2022-11-19 06:49:42,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:49:42,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '315#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:49:42,930 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:49:42,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:49:42,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2022-11-19 06:49:42,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586357772] [2022-11-19 06:49:42,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:42,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 06:49:42,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:42,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 06:49:42,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2022-11-19 06:49:42,933 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 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) [2022-11-19 06:49:42,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:42,990 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-11-19 06:49:42,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 06:49:42,991 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 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) Word has length 13 [2022-11-19 06:49:42,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:42,991 INFO L225 Difference]: With dead ends: 27 [2022-11-19 06:49:42,992 INFO L226 Difference]: Without dead ends: 15 [2022-11-19 06:49:42,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2022-11-19 06:49:42,993 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:42,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 25 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:49:42,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-19 06:49:42,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-19 06:49:42,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:42,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-19 06:49:42,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-11-19 06:49:43,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:43,000 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-19 06:49:43,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 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) [2022-11-19 06:49:43,000 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-19 06:49:43,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:49:43,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:43,001 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-19 06:49:43,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:49:43,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:43,208 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:43,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:43,209 INFO L85 PathProgramCache]: Analyzing trace with hash -510957161, now seen corresponding path program 3 times [2022-11-19 06:49:43,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:43,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191883236] [2022-11-19 06:49:43,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:43,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:43,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:43,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:43,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:43,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191883236] [2022-11-19 06:49:43,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191883236] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:43,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081236263] [2022-11-19 06:49:43,562 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:49:43,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:43,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:43,564 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:43,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:49:43,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:49:43,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:49:43,615 WARN L261 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 06:49:43,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:43,624 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 25 [2022-11-19 06:49:43,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 41 [2022-11-19 06:49:43,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-19 06:49:43,803 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:43,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:43,929 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:43,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081236263] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:49:43,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [977957231] [2022-11-19 06:49:43,952 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 06:49:43,952 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:43,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:49:43,953 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:49:43,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:49:44,014 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:49:44,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:49:44,028 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 [2022-11-19 06:49:44,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 49 [2022-11-19 06:49:44,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:44,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:44,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:44,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:44,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:44,130 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-19 06:49:44,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 276 treesize of output 268 [2022-11-19 06:49:44,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 29 [2022-11-19 06:49:44,251 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:49:44,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '473#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:49:44,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:49:44,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:49:44,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 16 [2022-11-19 06:49:44,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743973621] [2022-11-19 06:49:44,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:44,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 06:49:44,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:44,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 06:49:44,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:49:44,658 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:44,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:44,943 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2022-11-19 06:49:44,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 06:49:44,944 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 06:49:44,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:44,945 INFO L225 Difference]: With dead ends: 22 [2022-11-19 06:49:44,945 INFO L226 Difference]: Without dead ends: 20 [2022-11-19 06:49:44,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=173, Invalid=757, Unknown=0, NotChecked=0, Total=930 [2022-11-19 06:49:44,946 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 38 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:44,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 22 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 61 Invalid, 0 Unknown, 16 Unchecked, 0.1s Time] [2022-11-19 06:49:44,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-19 06:49:44,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-11-19 06:49:44,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:44,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-11-19 06:49:44,954 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2022-11-19 06:49:44,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:44,954 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-11-19 06:49:44,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:44,955 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-11-19 06:49:44,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-19 06:49:44,955 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:44,955 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1] [2022-11-19 06:49:44,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 06:49:45,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:45,161 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:45,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:45,161 INFO L85 PathProgramCache]: Analyzing trace with hash -555505575, now seen corresponding path program 4 times [2022-11-19 06:49:45,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:45,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108586717] [2022-11-19 06:49:45,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:45,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:45,256 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:45,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:45,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108586717] [2022-11-19 06:49:45,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108586717] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:45,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318099044] [2022-11-19 06:49:45,257 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:49:45,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:45,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:45,259 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:45,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:49:45,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:45,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 06:49:45,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:45,431 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:45,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:45,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318099044] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:49:45,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143994347] [2022-11-19 06:49:45,529 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 06:49:45,529 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:45,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:49:45,530 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:49:45,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:49:45,595 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 06:49:45,595 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-19 06:49:45,660 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:49:45,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:49:45,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 49 [2022-11-19 06:49:45,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:45,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:45,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:45,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:45,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:49:45,813 INFO L321 Elim1Store]: treesize reduction 226, result has 11.7 percent of original size [2022-11-19 06:49:45,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 276 treesize of output 278 [2022-11-19 06:49:45,885 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2022-11-19 06:49:45,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 29 [2022-11-19 06:49:45,984 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:49:46,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '664#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:49:46,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:49:46,301 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:49:46,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 15 [2022-11-19 06:49:46,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707999176] [2022-11-19 06:49:46,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:46,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 06:49:46,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:46,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 06:49:46,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:49:46,303 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:46,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:46,370 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-11-19 06:49:46,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 06:49:46,371 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-19 06:49:46,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:46,371 INFO L225 Difference]: With dead ends: 34 [2022-11-19 06:49:46,372 INFO L226 Difference]: Without dead ends: 19 [2022-11-19 06:49:46,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:49:46,373 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:46,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 25 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:49:46,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-19 06:49:46,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-19 06:49:46,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:46,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-19 06:49:46,380 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2022-11-19 06:49:46,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:46,380 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-19 06:49:46,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:49:46,380 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-19 06:49:46,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-19 06:49:46,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:46,381 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-11-19 06:49:46,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:49:46,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 06:49:46,586 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:46,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:46,587 INFO L85 PathProgramCache]: Analyzing trace with hash -1901841878, now seen corresponding path program 5 times [2022-11-19 06:49:46,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:46,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630008482] [2022-11-19 06:49:46,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:46,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:46,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:47,070 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:47,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:47,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630008482] [2022-11-19 06:49:47,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630008482] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:47,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847032123] [2022-11-19 06:49:47,070 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:49:47,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:47,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:47,072 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:47,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a83be1bf-9582-48ee-9da6-8cb49668373a/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:49:47,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 06:49:47,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:49:47,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-19 06:49:47,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:47,210 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 23 treesize of output 24 [2022-11-19 06:49:47,301 INFO L321 Elim1Store]: treesize reduction 52, result has 35.8 percent of original size [2022-11-19 06:49:47,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 58 [2022-11-19 06:49:47,426 INFO L321 Elim1Store]: treesize reduction 52, result has 35.8 percent of original size [2022-11-19 06:49:47,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 75 [2022-11-19 06:49:48,441 INFO L321 Elim1Store]: treesize reduction 51, result has 35.4 percent of original size [2022-11-19 06:49:48,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 72 [2022-11-19 06:49:48,529 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:49:48,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:49,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 56 [2022-11-19 06:49:49,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 104550 treesize of output 104166