./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7 --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 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:36:04,300 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:36:04,304 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:36:04,373 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:36:04,374 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:36:04,380 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:36:04,382 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:36:04,387 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:36:04,390 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:36:04,394 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:36:04,395 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:36:04,396 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:36:04,397 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:36:04,398 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:36:04,400 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:36:04,401 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:36:04,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:36:04,404 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:36:04,405 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:36:04,412 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:36:04,416 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:36:04,418 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:36:04,421 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:36:04,423 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:36:04,432 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:36:04,437 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:36:04,437 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:36:04,439 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:36:04,440 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:36:04,442 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:36:04,443 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:36:04,444 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:36:04,447 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:36:04,448 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:36:04,450 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:36:04,451 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:36:04,452 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:36:04,452 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:36:04,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:36:04,453 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:36:04,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:36:04,455 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:36:04,487 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:36:04,487 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:36:04,487 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:36:04,488 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:36:04,489 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:36:04,489 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:36:04,489 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:36:04,489 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:36:04,490 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:36:04,490 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:36:04,490 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:36:04,491 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:36:04,491 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:36:04,491 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:36:04,491 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:36:04,492 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:36:04,492 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:36:04,492 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:36:04,493 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:36:04,494 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:36:04,494 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:36:04,494 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:36:04,494 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:36:04,495 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:36:04,495 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:36:04,495 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:36:04,496 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:36:04,496 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:36:04,496 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:36:04,496 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:36:04,497 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:36:04,497 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:36:04,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:36:04,498 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:36:04,498 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:36:04,498 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:36:04,498 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:36:04,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:36:04,499 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:36:04,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:36:04,500 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:36:04,500 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a [2021-11-25 18:36:04,865 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:36:04,890 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:36:04,893 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:36:04,895 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:36:04,896 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:36:04,897 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-25 18:36:04,967 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/data/d6342218a/f45384a04c3446e4bb4d3121e27f138b/FLAGe48b98832 [2021-11-25 18:36:05,612 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:36:05,613 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-25 18:36:05,626 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/data/d6342218a/f45384a04c3446e4bb4d3121e27f138b/FLAGe48b98832 [2021-11-25 18:36:05,956 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/data/d6342218a/f45384a04c3446e4bb4d3121e27f138b [2021-11-25 18:36:05,960 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:36:05,963 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:36:05,968 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:36:05,969 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:36:05,973 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:36:05,975 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:36:05" (1/1) ... [2021-11-25 18:36:05,976 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ef66bee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:05, skipping insertion in model container [2021-11-25 18:36:05,977 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:36:05" (1/1) ... [2021-11-25 18:36:05,987 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:36:06,008 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:36:06,257 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-25 18:36:06,298 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:36:06,310 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:36:06,332 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-25 18:36:06,346 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:36:06,365 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:36:06,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06 WrapperNode [2021-11-25 18:36:06,366 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:36:06,367 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:36:06,367 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:36:06,368 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:36:06,376 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,384 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,407 INFO L137 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-25 18:36:06,411 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:36:06,413 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:36:06,413 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:36:06,413 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:36:06,424 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,424 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,444 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,451 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,468 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,476 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:36:06,479 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:36:06,480 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:36:06,480 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:36:06,481 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (1/1) ... [2021-11-25 18:36:06,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:36:06,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:06,518 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:36:06,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:36:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:36:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:36:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:36:06,578 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:36:06,578 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:36:06,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:36:06,578 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:36:06,578 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:36:06,659 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:36:06,661 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:36:06,838 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:36:06,887 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:36:06,887 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-25 18:36:06,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:36:06 BoogieIcfgContainer [2021-11-25 18:36:06,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:36:06,908 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:36:06,908 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:36:06,925 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:36:06,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:36:05" (1/3) ... [2021-11-25 18:36:06,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2852d06f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:36:06, skipping insertion in model container [2021-11-25 18:36:06,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:36:06" (2/3) ... [2021-11-25 18:36:06,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2852d06f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:36:06, skipping insertion in model container [2021-11-25 18:36:06,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:36:06" (3/3) ... [2021-11-25 18:36:06,929 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum2.c [2021-11-25 18:36:06,935 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:36:06,935 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:36:06,989 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:36:06,998 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:36:06,998 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:36:07,037 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 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) [2021-11-25 18:36:07,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 18:36:07,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:07,052 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:07,053 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:07,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:07,063 INFO L85 PathProgramCache]: Analyzing trace with hash -935721337, now seen corresponding path program 1 times [2021-11-25 18:36:07,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:07,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148609309] [2021-11-25 18:36:07,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:07,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:07,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:07,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:07,355 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:07,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148609309] [2021-11-25 18:36:07,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148609309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:36:07,357 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:36:07,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:36:07,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463436006] [2021-11-25 18:36:07,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:36:07,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:36:07,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:07,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:36:07,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:36:07,404 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 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) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:07,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:07,482 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2021-11-25 18:36:07,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:36:07,485 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 18:36:07,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:07,495 INFO L225 Difference]: With dead ends: 24 [2021-11-25 18:36:07,496 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 18:36:07,499 INFO L932 BasicCegarLoop]: 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 [2021-11-25 18:36:07,504 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:07,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:07,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 18:36:07,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 18:36:07,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:07,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2021-11-25 18:36:07,543 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2021-11-25 18:36:07,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:07,544 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2021-11-25 18:36:07,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:07,545 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2021-11-25 18:36:07,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:36:07,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:07,546 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:07,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:36:07,547 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:07,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:07,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1826524559, now seen corresponding path program 1 times [2021-11-25 18:36:07,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:07,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281813908] [2021-11-25 18:36:07,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:07,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:07,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:07,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:36:07,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:07,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281813908] [2021-11-25 18:36:07,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281813908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:36:07,652 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:36:07,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:36:07,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958242463] [2021-11-25 18:36:07,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:36:07,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:36:07,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:07,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:36:07,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:36:07,658 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 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) [2021-11-25 18:36:07,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:07,727 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2021-11-25 18:36:07,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:36:07,728 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 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) Word has length 10 [2021-11-25 18:36:07,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:07,729 INFO L225 Difference]: With dead ends: 21 [2021-11-25 18:36:07,730 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 18:36:07,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:36:07,739 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:07,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:36:07,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 18:36:07,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 18:36:07,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:07,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-25 18:36:07,762 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2021-11-25 18:36:07,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:07,764 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-25 18:36:07,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 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) [2021-11-25 18:36:07,766 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-25 18:36:07,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:36:07,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:07,768 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:07,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:36:07,769 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:07,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:07,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1533723065, now seen corresponding path program 1 times [2021-11-25 18:36:07,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:07,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749698291] [2021-11-25 18:36:07,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:07,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:07,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:07,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:36:07,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:07,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749698291] [2021-11-25 18:36:07,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749698291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:07,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627991577] [2021-11-25 18:36:07,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:07,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:07,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:07,939 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:07,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:36:08,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:08,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:36:08,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:08,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:36:08,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:08,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:36:08,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627991577] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:08,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68179886] [2021-11-25 18:36:08,395 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:08,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:08,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:08,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:08,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:08,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,545 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:08,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:08,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:08,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:08,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:08,773 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:08,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:08,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:09,106 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:09,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:09,337 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:09,338 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:09,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 18:36:09,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140243667] [2021-11-25 18:36:09,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:09,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:36:09,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:09,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:36:09,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:36:09,340 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 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) [2021-11-25 18:36:09,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:09,385 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2021-11-25 18:36:09,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:36:09,386 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 18:36:09,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:09,387 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:36:09,387 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 18:36:09,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:36:09,390 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:09,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:36:09,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 18:36:09,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 18:36:09,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:09,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 18:36:09,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2021-11-25 18:36:09,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:09,396 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 18:36:09,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 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) [2021-11-25 18:36:09,397 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 18:36:09,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:36:09,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:09,398 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:09,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:09,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:09,619 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:09,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:09,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1764319153, now seen corresponding path program 2 times [2021-11-25 18:36:09,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:09,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699674054] [2021-11-25 18:36:09,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:09,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:09,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:09,691 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:36:09,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:09,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699674054] [2021-11-25 18:36:09,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699674054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:09,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850312782] [2021-11-25 18:36:09,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:36:09,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:09,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:09,694 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:09,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:36:09,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:36:09,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:09,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:36:09,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:09,829 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:36:09,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:09,879 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:36:09,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850312782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:09,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670316779] [2021-11-25 18:36:09,885 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:09,886 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:09,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:09,886 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:09,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:09,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:09,958 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:09,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:09,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:10,012 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:10,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:10,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:10,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:10,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:10,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:10,286 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:10,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:10,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:10,814 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:11,057 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:11,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:11,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:11,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-25 18:36:11,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499376105] [2021-11-25 18:36:11,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:11,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:36:11,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:11,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:36:11,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:36:11,060 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 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) [2021-11-25 18:36:11,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:11,140 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-25 18:36:11,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:36:11,140 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 18:36:11,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:11,142 INFO L225 Difference]: With dead ends: 29 [2021-11-25 18:36:11,142 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 18:36:11,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:36:11,148 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:11,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 7 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:11,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 18:36:11,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 18:36:11,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:11,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-25 18:36:11,159 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2021-11-25 18:36:11,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:11,161 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-25 18:36:11,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 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) [2021-11-25 18:36:11,161 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-25 18:36:11,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 18:36:11,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:11,164 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:11,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:11,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:11,384 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:11,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:11,385 INFO L85 PathProgramCache]: Analyzing trace with hash 157211911, now seen corresponding path program 3 times [2021-11-25 18:36:11,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:11,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847423438] [2021-11-25 18:36:11,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:11,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:11,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:12,165 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:12,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:12,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847423438] [2021-11-25 18:36:12,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847423438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:12,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409229291] [2021-11-25 18:36:12,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:36:12,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:12,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:12,167 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:12,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:36:12,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:36:12,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:12,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 18:36:12,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:12,651 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:12,654 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:36:12,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 9 [2021-11-25 18:36:12,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:36:12,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:13,002 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-25 18:36:13,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 36 treesize of output 52 [2021-11-25 18:36:13,125 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-25 18:36:13,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 17 [2021-11-25 18:36:13,188 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:36:13,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409229291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:13,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [528446322] [2021-11-25 18:36:13,192 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:13,192 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:13,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:13,193 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:13,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:13,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,250 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:13,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:13,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,294 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:13,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:13,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:13,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:13,438 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:13,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:13,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:13,726 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:14,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '607#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:14,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:14,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:14,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 19 [2021-11-25 18:36:14,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143692538] [2021-11-25 18:36:14,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:14,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:36:14,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:14,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:36:14,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:36:14,013 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:14,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:14,272 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-11-25 18:36:14,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:36:14,273 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 18:36:14,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:14,274 INFO L225 Difference]: With dead ends: 33 [2021-11-25 18:36:14,274 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:36:14,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 35 SyntacticMatches, 16 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:36:14,276 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:14,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:36:14,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:36:14,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-25 18:36:14,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 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) [2021-11-25 18:36:14,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-25 18:36:14,283 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2021-11-25 18:36:14,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:14,284 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-25 18:36:14,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:14,284 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-25 18:36:14,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 18:36:14,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:14,285 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:14,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:14,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:14,510 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:14,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:14,511 INFO L85 PathProgramCache]: Analyzing trace with hash 167461184, now seen corresponding path program 4 times [2021-11-25 18:36:14,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:14,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986089722] [2021-11-25 18:36:14,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:14,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:14,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:14,595 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:36:14,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:14,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986089722] [2021-11-25 18:36:14,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986089722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:14,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088503379] [2021-11-25 18:36:14,596 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:36:14,596 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:14,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:14,597 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:14,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:36:14,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:14,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:36:14,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:14,767 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:36:14,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:14,828 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:36:14,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088503379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:14,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276721801] [2021-11-25 18:36:14,831 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:14,832 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:14,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:14,832 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:14,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:14,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:14,883 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:14,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:14,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:14,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:14,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:14,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:15,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:15,028 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:15,052 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:15,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:15,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:15,331 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:15,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '850#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:15,560 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:15,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:15,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-25 18:36:15,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771981225] [2021-11-25 18:36:15,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:15,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 18:36:15,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:15,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 18:36:15,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:36:15,563 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:15,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:15,735 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2021-11-25 18:36:15,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:36:15,739 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 18:36:15,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:15,740 INFO L225 Difference]: With dead ends: 54 [2021-11-25 18:36:15,740 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 18:36:15,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:36:15,743 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:15,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:15,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 18:36:15,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 18:36:15,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:15,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-25 18:36:15,760 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2021-11-25 18:36:15,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:15,762 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-25 18:36:15,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:15,762 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-25 18:36:15,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:36:15,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:15,765 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:15,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:15,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:15,979 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:15,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:15,980 INFO L85 PathProgramCache]: Analyzing trace with hash -1030126280, now seen corresponding path program 5 times [2021-11-25 18:36:15,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:15,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012217808] [2021-11-25 18:36:15,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:15,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:16,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:36:16,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:16,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012217808] [2021-11-25 18:36:16,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012217808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:16,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241735806] [2021-11-25 18:36:16,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:36:16,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:16,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:16,106 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:16,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:36:16,183 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:36:16,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:16,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:36:16,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:16,330 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:36:16,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:16,433 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:36:16,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241735806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:16,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458437338] [2021-11-25 18:36:16,437 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:16,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:16,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:16,438 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:16,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:16,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:16,489 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:16,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:16,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:16,534 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:16,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:16,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:16,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:16,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:16,644 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:16,670 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:16,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:16,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:16,915 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:17,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1148#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:17,120 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:17,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:17,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 18:36:17,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426646467] [2021-11-25 18:36:17,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:17,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:36:17,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:17,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:36:17,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:36:17,123 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:17,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:17,286 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2021-11-25 18:36:17,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:36:17,286 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 18:36:17,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:17,287 INFO L225 Difference]: With dead ends: 42 [2021-11-25 18:36:17,287 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 18:36:17,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:36:17,289 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:17,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 11 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:17,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 18:36:17,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 18:36:17,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:17,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 18:36:17,294 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2021-11-25 18:36:17,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:17,295 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 18:36:17,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:17,295 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 18:36:17,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 18:36:17,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:17,296 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:17,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:17,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:17,522 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:17,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:17,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1582715975, now seen corresponding path program 6 times [2021-11-25 18:36:17,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:17,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915927756] [2021-11-25 18:36:17,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:17,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:17,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:18,714 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:18,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:18,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915927756] [2021-11-25 18:36:18,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915927756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:18,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44536670] [2021-11-25 18:36:18,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:36:18,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:18,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:18,717 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:18,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:36:18,796 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:36:18,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:18,798 WARN L261 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 18:36:18,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:19,487 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:36:19,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:20,127 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-25 18:36:20,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-25 18:36:20,503 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-25 18:36:20,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-25 18:36:20,576 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:36:20,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44536670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:20,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145542146] [2021-11-25 18:36:20,581 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:20,581 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:20,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:20,582 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:20,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:20,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,642 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:20,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:20,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,698 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:20,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:20,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:20,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:20,843 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:20,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:20,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:21,051 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:21,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1457#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:21,352 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:21,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:21,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12, 12] total 37 [2021-11-25 18:36:21,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116881954] [2021-11-25 18:36:21,353 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:21,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 18:36:21,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:21,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 18:36:21,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1569, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:36:21,355 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 37 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:22,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:22,208 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-25 18:36:22,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:36:22,208 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 37 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 18:36:22,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:22,209 INFO L225 Difference]: With dead ends: 41 [2021-11-25 18:36:22,209 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 18:36:22,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 43 SyntacticMatches, 10 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 838 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=216, Invalid=2136, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:36:22,212 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:22,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 39 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:36:22,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 18:36:22,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2021-11-25 18:36:22,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:22,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-25 18:36:22,219 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2021-11-25 18:36:22,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:22,220 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-25 18:36:22,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 37 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:22,220 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-25 18:36:22,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 18:36:22,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:22,221 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:22,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:22,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:22,444 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:22,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:22,444 INFO L85 PathProgramCache]: Analyzing trace with hash 914045538, now seen corresponding path program 7 times [2021-11-25 18:36:22,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:22,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255479222] [2021-11-25 18:36:22,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:22,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:22,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:22,567 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:36:22,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:22,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255479222] [2021-11-25 18:36:22,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255479222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:22,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030617696] [2021-11-25 18:36:22,568 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:36:22,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:22,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:22,579 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:22,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:36:22,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:22,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:36:22,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:22,762 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:36:22,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:36:22,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030617696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:22,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910055490] [2021-11-25 18:36:22,849 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:22,849 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:22,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:22,850 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:22,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:22,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:22,903 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:22,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:22,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:22,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:22,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:22,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:23,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:23,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:23,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:23,031 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:23,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:23,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:23,211 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:23,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1775#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:23,444 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:23,444 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:23,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-25 18:36:23,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784130903] [2021-11-25 18:36:23,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:23,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:36:23,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:23,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:36:23,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:36:23,446 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:23,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:23,619 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-11-25 18:36:23,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:36:23,620 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 18:36:23,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:23,623 INFO L225 Difference]: With dead ends: 68 [2021-11-25 18:36:23,623 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:36:23,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:36:23,625 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:23,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:23,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:36:23,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-25 18:36:23,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:23,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2021-11-25 18:36:23,633 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2021-11-25 18:36:23,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:23,633 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2021-11-25 18:36:23,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:23,634 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2021-11-25 18:36:23,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:36:23,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:23,635 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:23,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:23,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:23,860 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:23,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:23,860 INFO L85 PathProgramCache]: Analyzing trace with hash 746631530, now seen corresponding path program 8 times [2021-11-25 18:36:23,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:23,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126765475] [2021-11-25 18:36:23,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:23,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:23,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:23,959 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:36:23,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:23,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126765475] [2021-11-25 18:36:23,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126765475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:23,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421491174] [2021-11-25 18:36:23,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:36:23,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:23,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:23,962 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:23,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:36:24,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:36:24,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:24,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:36:24,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:24,183 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:36:24,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:24,267 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:36:24,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421491174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:24,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104208722] [2021-11-25 18:36:24,270 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:24,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:24,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:24,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:24,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:24,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:24,318 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:24,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:24,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:24,360 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:24,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:24,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:24,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:24,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:24,441 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:24,467 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:24,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:24,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:24,769 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:24,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2150#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:24,930 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:24,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:24,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 18:36:24,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912511634] [2021-11-25 18:36:24,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:24,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:36:24,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:24,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:36:24,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:36:24,932 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:25,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:25,085 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2021-11-25 18:36:25,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:36:25,086 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 18:36:25,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:25,087 INFO L225 Difference]: With dead ends: 51 [2021-11-25 18:36:25,087 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:36:25,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:36:25,088 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:25,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 19 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:25,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:36:25,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 18:36:25,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:25,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-25 18:36:25,095 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2021-11-25 18:36:25,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:25,095 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-25 18:36:25,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:25,096 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-25 18:36:25,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 18:36:25,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:25,097 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:25,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:25,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:36:25,319 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:25,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:25,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1701461113, now seen corresponding path program 9 times [2021-11-25 18:36:25,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:25,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925169774] [2021-11-25 18:36:25,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:25,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:26,875 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:26,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:26,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925169774] [2021-11-25 18:36:26,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925169774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:26,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541649398] [2021-11-25 18:36:26,876 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:36:26,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:26,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:26,877 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:26,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:36:26,945 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:36:26,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:26,948 WARN L261 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 18:36:26,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:27,872 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:36:27,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:28,726 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-25 18:36:28,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-25 18:36:29,457 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-25 18:36:29,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-25 18:36:29,516 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:36:29,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541649398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:29,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715540290] [2021-11-25 18:36:29,518 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:29,518 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:29,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:29,519 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:29,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:29,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:29,567 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:29,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:29,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:29,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:29,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:29,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:29,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:29,668 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:29,692 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:29,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:29,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:29,953 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:30,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2525#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:30,290 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:30,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:30,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 14, 14] total 43 [2021-11-25 18:36:30,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998273371] [2021-11-25 18:36:30,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:30,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:36:30,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:30,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:36:30,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2097, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:36:30,294 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 43 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:31,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:31,735 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2021-11-25 18:36:31,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:36:31,736 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 43 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 18:36:31,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:31,736 INFO L225 Difference]: With dead ends: 49 [2021-11-25 18:36:31,736 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 18:36:31,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 52 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1114 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=307, Invalid=3475, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 18:36:31,738 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:31,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 51 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:36:31,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 18:36:31,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-25 18:36:31,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:31,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-25 18:36:31,748 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 29 [2021-11-25 18:36:31,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:31,749 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-25 18:36:31,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 43 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:31,750 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-25 18:36:31,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:36:31,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:31,751 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:31,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:31,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:36:31,966 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:31,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:31,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1814674624, now seen corresponding path program 10 times [2021-11-25 18:36:31,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:31,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655647322] [2021-11-25 18:36:31,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:31,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:32,072 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:36:32,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:32,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655647322] [2021-11-25 18:36:32,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655647322] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:32,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703865844] [2021-11-25 18:36:32,073 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:36:32,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:32,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:32,074 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:32,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:36:32,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:32,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:36:32,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:32,280 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:36:32,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:32,355 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:36:32,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703865844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:32,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698121729] [2021-11-25 18:36:32,358 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:32,358 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:32,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:32,359 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:32,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:32,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:32,406 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:32,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:32,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:32,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:32,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:32,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:36:32,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:32,508 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:36:32,536 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:36:32,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:36:32,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:32,791 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:32,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2920#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:32,985 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:32,985 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:32,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 18:36:32,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957967703] [2021-11-25 18:36:32,985 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:32,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:36:32,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:32,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:36:32,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:36:32,987 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:33,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:33,168 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2021-11-25 18:36:33,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:36:33,168 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-25 18:36:33,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:33,169 INFO L225 Difference]: With dead ends: 82 [2021-11-25 18:36:33,169 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 18:36:33,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=650, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:36:33,170 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:33,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:33,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 18:36:33,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-25 18:36:33,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:33,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-11-25 18:36:33,179 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 30 [2021-11-25 18:36:33,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:33,180 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-11-25 18:36:33,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:33,180 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-11-25 18:36:33,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 18:36:33,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:33,181 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:33,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:33,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 18:36:33,387 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:33,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:33,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1885508936, now seen corresponding path program 11 times [2021-11-25 18:36:33,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:33,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906677025] [2021-11-25 18:36:33,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:33,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:33,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:33,511 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:36:33,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:33,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906677025] [2021-11-25 18:36:33,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906677025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:33,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712036950] [2021-11-25 18:36:33,512 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:36:33,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:33,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:33,513 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:33,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:36:33,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:36:33,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:33,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:36:33,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:33,748 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:36:33,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:33,860 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:36:33,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712036950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:33,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140549566] [2021-11-25 18:36:33,863 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:33,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:33,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:33,864 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:33,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:33,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:33,917 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:33,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:33,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:33,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:33,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:33,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:34,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:34,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:34,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:34,031 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:34,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:34,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:34,221 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:34,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3372#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:34,426 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:34,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:34,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 18:36:34,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238104575] [2021-11-25 18:36:34,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:34,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:36:34,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:34,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:36:34,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:36:34,427 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:34,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:34,600 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-11-25 18:36:34,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:36:34,600 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-25 18:36:34,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:34,601 INFO L225 Difference]: With dead ends: 60 [2021-11-25 18:36:34,601 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 18:36:34,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:36:34,602 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:34,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 13 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:34,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 18:36:34,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-25 18:36:34,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:34,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-11-25 18:36:34,610 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2021-11-25 18:36:34,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:34,611 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-11-25 18:36:34,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:34,611 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-11-25 18:36:34,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:36:34,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:34,613 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:34,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:34,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:34,815 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:34,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:34,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1338230201, now seen corresponding path program 12 times [2021-11-25 18:36:34,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:34,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185158028] [2021-11-25 18:36:34,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:34,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:34,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:36,747 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:36,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:36,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185158028] [2021-11-25 18:36:36,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185158028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:36,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879825510] [2021-11-25 18:36:36,747 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:36:36,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:36,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:36,749 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:36,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:36:36,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:36:36,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:36,809 WARN L261 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-25 18:36:36,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:38,023 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:36:38,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:39,415 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-25 18:36:39,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-25 18:36:41,519 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-25 18:36:41,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-25 18:36:41,615 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:36:41,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879825510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:41,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409891732] [2021-11-25 18:36:41,618 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:41,618 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:41,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:41,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:41,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:41,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,662 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:41,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:41,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,698 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:41,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:41,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:41,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:41,792 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:41,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:41,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:41,967 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:42,486 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3819#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:42,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:42,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:42,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 55 [2021-11-25 18:36:42,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358203748] [2021-11-25 18:36:42,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:42,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-25 18:36:42,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:42,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-25 18:36:42,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=3328, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 18:36:42,490 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 55 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:44,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:44,803 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2021-11-25 18:36:44,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:36:44,803 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 55 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 18:36:44,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:44,804 INFO L225 Difference]: With dead ends: 57 [2021-11-25 18:36:44,804 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 18:36:44,806 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 63 SyntacticMatches, 12 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1782 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=425, Invalid=5581, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 18:36:44,807 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 1122 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:44,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 65 Invalid, 1210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1122 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:36:44,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 18:36:44,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2021-11-25 18:36:44,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:44,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-11-25 18:36:44,819 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2021-11-25 18:36:44,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:44,819 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-11-25 18:36:44,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 55 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:44,820 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-11-25 18:36:44,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 18:36:44,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:44,821 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:44,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 18:36:45,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:36:45,027 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:45,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:45,028 INFO L85 PathProgramCache]: Analyzing trace with hash 177241442, now seen corresponding path program 13 times [2021-11-25 18:36:45,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:45,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908256774] [2021-11-25 18:36:45,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:45,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:45,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:45,172 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:36:45,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:45,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908256774] [2021-11-25 18:36:45,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908256774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:45,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522266100] [2021-11-25 18:36:45,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:36:45,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:45,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:45,175 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:45,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:36:45,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:45,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:36:45,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:45,423 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:36:45,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:45,513 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:36:45,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522266100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:45,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209127895] [2021-11-25 18:36:45,515 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:45,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:45,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:45,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:45,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:45,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,568 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:36:45,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:36:45,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,611 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:45,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:45,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:45,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:45,733 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:45,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:45,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:45,927 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:46,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4285#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:46,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:46,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:46,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-25 18:36:46,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532685525] [2021-11-25 18:36:46,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:46,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 18:36:46,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:46,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 18:36:46,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:36:46,139 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:46,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:46,353 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2021-11-25 18:36:46,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:36:46,354 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 18:36:46,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:46,355 INFO L225 Difference]: With dead ends: 96 [2021-11-25 18:36:46,355 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 18:36:46,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:36:46,357 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:46,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 9 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:46,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 18:36:46,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 18:36:46,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:46,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2021-11-25 18:36:46,368 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 35 [2021-11-25 18:36:46,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:46,369 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2021-11-25 18:36:46,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:46,369 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2021-11-25 18:36:46,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:36:46,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:46,370 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:46,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:46,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:36:46,583 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:46,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:46,584 INFO L85 PathProgramCache]: Analyzing trace with hash -191706518, now seen corresponding path program 14 times [2021-11-25 18:36:46,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:46,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116799113] [2021-11-25 18:36:46,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:46,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:46,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:46,735 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:36:46,735 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:46,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116799113] [2021-11-25 18:36:46,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116799113] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:46,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821496798] [2021-11-25 18:36:46,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:36:46,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:46,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:46,740 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:46,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:36:46,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:36:46,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:46,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:36:46,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:47,022 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:36:47,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:47,126 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:36:47,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [821496798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:47,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155548636] [2021-11-25 18:36:47,128 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:47,128 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:47,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:47,129 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:47,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:47,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,183 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:47,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:47,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:47,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:47,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:47,318 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:47,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:47,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:47,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:47,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4814#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:47,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:47,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:47,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 18:36:47,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981456873] [2021-11-25 18:36:47,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:47,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:36:47,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:47,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:36:47,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:36:47,676 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:36:47,870 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2021-11-25 18:36:47,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:36:47,870 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 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 36 [2021-11-25 18:36:47,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:36:47,871 INFO L225 Difference]: With dead ends: 69 [2021-11-25 18:36:47,871 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 18:36:47,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 18:36:47,873 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:36:47,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 11 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:36:47,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 18:36:47,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 18:36:47,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:47,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-25 18:36:47,883 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2021-11-25 18:36:47,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:36:47,883 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-25 18:36:47,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:36:47,884 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-25 18:36:47,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 18:36:47,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:36:47,885 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:36:47,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:36:48,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:36:48,095 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:36:48,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:36:48,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1452099065, now seen corresponding path program 15 times [2021-11-25 18:36:48,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:36:48,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170868416] [2021-11-25 18:36:48,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:36:48,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:36:48,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:36:50,390 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:36:50,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:36:50,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170868416] [2021-11-25 18:36:50,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170868416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:36:50,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253144469] [2021-11-25 18:36:50,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:36:50,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:36:50,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:36:50,398 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:36:50,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:36:50,477 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:36:50,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:36:50,480 WARN L261 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-25 18:36:50,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:36:52,031 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:36:52,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:36:53,957 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-25 18:36:53,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-25 18:36:56,887 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-25 18:36:56,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-25 18:36:57,004 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:36:57,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253144469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:36:57,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066688743] [2021-11-25 18:36:57,006 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:36:57,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:36:57,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:36:57,007 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:36:57,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:36:57,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,064 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:36:57,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:36:57,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:36:57,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:36:57,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:36:57,174 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:36:57,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:36:57,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:36:57,345 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:36:57,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5329#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:36:57,837 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:36:57,837 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:36:57,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 18, 18] total 63 [2021-11-25 18:36:57,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660133349] [2021-11-25 18:36:57,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:36:57,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 18:36:57,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:36:57,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 18:36:57,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=4287, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 18:36:57,840 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 63 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:00,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:00,908 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2021-11-25 18:37:00,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 18:37:00,911 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 63 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-25 18:37:00,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:00,913 INFO L225 Difference]: With dead ends: 65 [2021-11-25 18:37:00,914 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 18:37:00,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2625 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=551, Invalid=7459, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 18:37:00,918 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 1517 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:00,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 77 Invalid, 1599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 1517 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 18:37:00,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 18:37:00,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2021-11-25 18:37:00,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:00,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2021-11-25 18:37:00,941 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2021-11-25 18:37:00,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:00,942 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2021-11-25 18:37:00,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 63 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:00,942 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2021-11-25 18:37:00,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:37:00,943 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:00,944 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:00,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:01,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:37:01,172 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:01,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:01,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1357133760, now seen corresponding path program 16 times [2021-11-25 18:37:01,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:01,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95126859] [2021-11-25 18:37:01,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:01,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:01,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:01,346 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:37:01,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:01,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95126859] [2021-11-25 18:37:01,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95126859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:01,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769439401] [2021-11-25 18:37:01,347 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:37:01,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:01,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:01,349 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:01,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:37:01,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:01,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:37:01,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:01,646 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:37:01,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:01,745 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:37:01,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769439401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:01,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535881159] [2021-11-25 18:37:01,748 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:01,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:01,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:01,749 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:01,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:01,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,790 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:01,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:01,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:37:01,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:37:01,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:01,902 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:37:01,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:37:01,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:02,063 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:02,247 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5866#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:02,248 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:02,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:02,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-25 18:37:02,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551022380] [2021-11-25 18:37:02,248 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:02,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 18:37:02,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:02,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 18:37:02,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:37:02,249 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:02,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:02,499 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2021-11-25 18:37:02,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:37:02,499 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 18:37:02,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:02,500 INFO L225 Difference]: With dead ends: 110 [2021-11-25 18:37:02,500 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 18:37:02,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:37:02,501 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:02,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:37:02,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 18:37:02,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 18:37:02,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:02,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-11-25 18:37:02,519 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 40 [2021-11-25 18:37:02,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:02,519 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-11-25 18:37:02,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:02,520 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-11-25 18:37:02,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 18:37:02,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:02,521 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:02,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:02,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:37:02,721 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:02,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:02,722 INFO L85 PathProgramCache]: Analyzing trace with hash 690511928, now seen corresponding path program 17 times [2021-11-25 18:37:02,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:02,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123276198] [2021-11-25 18:37:02,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:02,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:02,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:02,901 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:37:02,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:02,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123276198] [2021-11-25 18:37:02,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123276198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:02,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214735021] [2021-11-25 18:37:02,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:37:02,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:02,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:02,903 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:02,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:37:03,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:37:03,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:37:03,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:37:03,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:03,266 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:37:03,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:03,362 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:37:03,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214735021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:03,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [971709087] [2021-11-25 18:37:03,363 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:03,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:03,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:03,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:03,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:03,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:03,404 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:37:03,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:37:03,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:03,434 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:03,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:03,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:03,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:37:03,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:03,524 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:37:03,547 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:37:03,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:37:03,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:03,785 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:04,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6472#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:04,033 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:04,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:04,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 18:37:04,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049036986] [2021-11-25 18:37:04,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:04,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 18:37:04,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:04,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 18:37:04,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:37:04,037 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:04,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:04,331 INFO L93 Difference]: Finished difference Result 78 states and 90 transitions. [2021-11-25 18:37:04,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:37:04,332 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 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 41 [2021-11-25 18:37:04,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:04,332 INFO L225 Difference]: With dead ends: 78 [2021-11-25 18:37:04,332 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 18:37:04,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:37:04,334 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:04,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 15 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:37:04,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 18:37:04,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 18:37:04,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:04,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-11-25 18:37:04,345 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2021-11-25 18:37:04,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:04,345 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-11-25 18:37:04,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:04,346 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-11-25 18:37:04,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:37:04,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:04,347 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:04,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:04,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:04,564 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:04,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:04,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1551560775, now seen corresponding path program 18 times [2021-11-25 18:37:04,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:04,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128756989] [2021-11-25 18:37:04,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:04,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:04,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:07,109 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 3 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:37:07,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:07,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128756989] [2021-11-25 18:37:07,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128756989] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:07,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801894415] [2021-11-25 18:37:07,110 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:37:07,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:07,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:07,111 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:07,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:37:07,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:37:07,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:37:07,230 WARN L261 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-25 18:37:07,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:08,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:37:08,721 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:37:08,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 18:37:08,861 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:37:08,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:11,812 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-25 18:37:11,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-25 18:37:19,408 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-25 18:37:19,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-25 18:37:19,500 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:37:19,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801894415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:19,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [105609208] [2021-11-25 18:37:19,502 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:19,502 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:19,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:19,503 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:19,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:19,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,544 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:37:19,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:37:19,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,575 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:19,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:19,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:37:19,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:19,694 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:37:19,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:37:19,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:19,839 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:20,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7047#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:20,308 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:20,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:20,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 20, 20] total 63 [2021-11-25 18:37:20,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552908617] [2021-11-25 18:37:20,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:20,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 18:37:20,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:20,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 18:37:20,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=4310, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 18:37:20,311 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 63 states, 63 states have (on average 1.6349206349206349) internal successors, (103), 63 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:23,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:23,885 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2021-11-25 18:37:23,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 18:37:23,887 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.6349206349206349) internal successors, (103), 63 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 18:37:23,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:23,888 INFO L225 Difference]: With dead ends: 73 [2021-11-25 18:37:23,888 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 18:37:23,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 85 SyntacticMatches, 22 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2430 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=597, Invalid=8145, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 18:37:23,892 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1621 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 1621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:23,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 71 Invalid, 1741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 1621 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 18:37:23,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 18:37:23,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2021-11-25 18:37:23,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:23,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2021-11-25 18:37:23,906 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2021-11-25 18:37:23,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:23,907 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2021-11-25 18:37:23,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.6349206349206349) internal successors, (103), 63 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:23,907 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2021-11-25 18:37:23,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 18:37:23,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:23,908 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:23,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:24,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-25 18:37:24,127 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:24,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:24,128 INFO L85 PathProgramCache]: Analyzing trace with hash 1730244706, now seen corresponding path program 19 times [2021-11-25 18:37:24,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:24,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37554269] [2021-11-25 18:37:24,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:24,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:24,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:24,329 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:37:24,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:24,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37554269] [2021-11-25 18:37:24,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37554269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:24,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835294626] [2021-11-25 18:37:24,330 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:37:24,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:24,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:24,331 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:24,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:37:24,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:24,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:37:24,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:37:24,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:24,734 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:37:24,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835294626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:24,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1904739622] [2021-11-25 18:37:24,736 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:24,737 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:24,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:24,737 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:24,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:24,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,791 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:24,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:24,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:37:24,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:37:24,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:24,889 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:37:24,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:37:24,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:25,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:25,224 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7655#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:25,224 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:25,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:25,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-25 18:37:25,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674838532] [2021-11-25 18:37:25,225 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:25,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 18:37:25,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:25,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 18:37:25,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:37:25,226 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:25,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:25,518 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2021-11-25 18:37:25,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:37:25,519 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 18:37:25,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:25,519 INFO L225 Difference]: With dead ends: 124 [2021-11-25 18:37:25,520 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 18:37:25,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1310, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:37:25,521 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:25,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:37:25,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 18:37:25,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-25 18:37:25,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:25,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-11-25 18:37:25,536 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 45 [2021-11-25 18:37:25,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:25,537 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-11-25 18:37:25,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:25,537 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-11-25 18:37:25,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 18:37:25,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:25,538 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:25,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:25,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 18:37:25,743 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:25,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:25,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1483926678, now seen corresponding path program 20 times [2021-11-25 18:37:25,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:25,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113220286] [2021-11-25 18:37:25,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:25,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:25,944 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:37:25,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:25,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113220286] [2021-11-25 18:37:25,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113220286] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:25,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889146138] [2021-11-25 18:37:25,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:37:25,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:25,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:25,946 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:25,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:37:26,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:37:26,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:37:26,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:37:26,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:26,323 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:37:26,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:26,426 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:37:26,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889146138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:26,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211942960] [2021-11-25 18:37:26,428 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:26,428 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:26,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:26,429 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:26,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:26,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:26,473 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:26,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:26,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:26,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:37:26,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:26,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:37:26,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:26,539 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:37:26,560 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:37:26,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:37:26,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:26,731 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:26,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8338#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:26,946 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:26,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:26,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 18:37:26,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85959897] [2021-11-25 18:37:26,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:26,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:37:26,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:26,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:37:26,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:37:26,949 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:27,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:27,219 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2021-11-25 18:37:27,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:37:27,222 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 18:37:27,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:27,222 INFO L225 Difference]: With dead ends: 87 [2021-11-25 18:37:27,222 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 18:37:27,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 18:37:27,224 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 50 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:27,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 9 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:37:27,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 18:37:27,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 18:37:27,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:27,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-25 18:37:27,234 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2021-11-25 18:37:27,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:27,235 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-25 18:37:27,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:27,235 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-25 18:37:27,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:37:27,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:27,235 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:27,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:27,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 18:37:27,436 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:27,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:27,436 INFO L85 PathProgramCache]: Analyzing trace with hash -762724217, now seen corresponding path program 21 times [2021-11-25 18:37:27,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:27,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797826116] [2021-11-25 18:37:27,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:27,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:27,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:30,855 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 3 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:37:30,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:30,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797826116] [2021-11-25 18:37:30,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797826116] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:30,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624356109] [2021-11-25 18:37:30,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:37:30,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:30,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:30,857 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:30,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:37:30,980 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:37:30,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:37:30,984 WARN L261 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-25 18:37:30,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:32,994 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:37:32,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:36,872 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-25 18:37:36,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-25 18:37:53,026 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-25 18:37:53,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-25 18:37:53,127 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:37:53,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624356109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:53,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184997596] [2021-11-25 18:37:53,129 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:53,129 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:53,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:53,129 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:53,130 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:53,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:53,181 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:37:53,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:37:53,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:53,224 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:53,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:53,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:53,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:37:53,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:53,348 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:37:53,373 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:37:53,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:37:53,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:53,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:54,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8980#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:54,039 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:54,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:54,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 22, 22] total 70 [2021-11-25 18:37:54,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45086215] [2021-11-25 18:37:54,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:54,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-25 18:37:54,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:54,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-25 18:37:54,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=5239, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 18:37:54,044 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 70 states, 70 states have (on average 1.6285714285714286) internal successors, (114), 70 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:58,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:37:58,297 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2021-11-25 18:37:58,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-25 18:37:58,298 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.6285714285714286) internal successors, (114), 70 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 18:37:58,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:37:58,298 INFO L225 Difference]: With dead ends: 81 [2021-11-25 18:37:58,298 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 18:37:58,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 92 SyntacticMatches, 28 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3464 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=677, Invalid=9423, Unknown=0, NotChecked=0, Total=10100 [2021-11-25 18:37:58,300 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1993 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 2106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 1993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:37:58,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 81 Invalid, 2106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 1993 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-25 18:37:58,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 18:37:58,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2021-11-25 18:37:58,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:58,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2021-11-25 18:37:58,311 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2021-11-25 18:37:58,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:37:58,311 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2021-11-25 18:37:58,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.6285714285714286) internal successors, (114), 70 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:37:58,312 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2021-11-25 18:37:58,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:37:58,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:37:58,312 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:37:58,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 18:37:58,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:58,513 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:37:58,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:37:58,513 INFO L85 PathProgramCache]: Analyzing trace with hash 415589312, now seen corresponding path program 22 times [2021-11-25 18:37:58,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:37:58,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20827558] [2021-11-25 18:37:58,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:37:58,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:37:58,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:58,747 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:37:58,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:37:58,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20827558] [2021-11-25 18:37:58,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20827558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:37:58,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57697286] [2021-11-25 18:37:58,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:37:58,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:37:58,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:37:58,749 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:37:58,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 18:37:58,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:37:58,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:37:58,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:37:59,131 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:37:59,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:37:59,237 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:37:59,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57697286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:37:59,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077597520] [2021-11-25 18:37:59,239 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:37:59,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:37:59,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:37:59,240 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:37:59,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:37:59,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,303 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:37:59,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:37:59,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:37:59,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:37:59,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:37:59,394 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:37:59,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:37:59,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:37:59,563 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:37:59,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9651#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:37:59,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:37:59,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:37:59,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-25 18:37:59,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249852347] [2021-11-25 18:37:59,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:37:59,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 18:37:59,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:37:59,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 18:37:59,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:37:59,843 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:00,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:38:00,180 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2021-11-25 18:38:00,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:38:00,181 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 18:38:00,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:38:00,182 INFO L225 Difference]: With dead ends: 138 [2021-11-25 18:38:00,182 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 18:38:00,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=400, Invalid=1580, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:38:00,183 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:38:00,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 19 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 411 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:38:00,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 18:38:00,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-25 18:38:00,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1142857142857143) internal successors, (78), 70 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:00,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2021-11-25 18:38:00,201 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 50 [2021-11-25 18:38:00,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:38:00,201 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2021-11-25 18:38:00,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:00,201 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2021-11-25 18:38:00,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 18:38:00,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:38:00,202 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:38:00,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 18:38:00,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:00,415 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:38:00,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:38:00,416 INFO L85 PathProgramCache]: Analyzing trace with hash -1764858440, now seen corresponding path program 23 times [2021-11-25 18:38:00,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:38:00,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759510267] [2021-11-25 18:38:00,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:38:00,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:38:00,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:00,643 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:38:00,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:38:00,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759510267] [2021-11-25 18:38:00,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759510267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:38:00,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807158305] [2021-11-25 18:38:00,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:38:00,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:00,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:38:00,645 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:38:00,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 18:38:00,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:38:00,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:38:00,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:38:00,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:38:01,225 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:38:01,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:38:01,350 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:38:01,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807158305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:38:01,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764311761] [2021-11-25 18:38:01,352 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:38:01,352 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:38:01,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:38:01,353 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:38:01,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:38:01,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,411 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:38:01,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:38:01,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,450 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:38:01,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:38:01,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:38:01,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:01,550 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:38:01,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:38:01,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:38:01,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:38:02,021 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10419#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:38:02,021 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:38:02,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:38:02,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-25 18:38:02,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574566419] [2021-11-25 18:38:02,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:38:02,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 18:38:02,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:38:02,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 18:38:02,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:38:02,024 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:02,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:38:02,503 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2021-11-25 18:38:02,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:38:02,504 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 18:38:02,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:38:02,505 INFO L225 Difference]: With dead ends: 96 [2021-11-25 18:38:02,505 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 18:38:02,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:38:02,507 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 369 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 369 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:38:02,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 9 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [369 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:38:02,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 18:38:02,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-25 18:38:02,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:02,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 18:38:02,532 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2021-11-25 18:38:02,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:38:02,532 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 18:38:02,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:02,533 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 18:38:02,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 18:38:02,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:38:02,534 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:38:02,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 18:38:02,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 18:38:02,759 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:38:02,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:38:02,760 INFO L85 PathProgramCache]: Analyzing trace with hash 1538886073, now seen corresponding path program 24 times [2021-11-25 18:38:02,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:38:02,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721858046] [2021-11-25 18:38:02,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:38:02,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:38:02,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:06,659 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 10 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:38:06,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:38:06,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721858046] [2021-11-25 18:38:06,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721858046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:38:06,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550249742] [2021-11-25 18:38:06,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:38:06,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:06,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:38:06,660 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:38:06,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 18:38:06,785 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:38:06,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:38:06,789 WARN L261 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-25 18:38:06,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:38:08,783 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:38:08,785 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:38:08,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 14 [2021-11-25 18:38:08,900 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:38:08,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:38:14,365 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-25 18:38:14,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-25 18:38:32,173 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-25 18:38:32,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-25 18:38:32,302 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:38:32,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550249742] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:38:32,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061097764] [2021-11-25 18:38:32,305 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:38:32,305 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:38:32,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:38:32,305 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:38:32,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:38:32,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,348 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:38:32,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:38:32,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:38:32,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:38:32,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:32,433 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:38:32,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:38:32,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:38:32,558 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:38:33,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11134#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:38:33,145 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:38:33,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:38:33,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 24, 24] total 81 [2021-11-25 18:38:33,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122835582] [2021-11-25 18:38:33,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:38:33,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 18:38:33,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:38:33,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 18:38:33,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=6939, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 18:38:33,147 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 81 states, 81 states have (on average 1.5925925925925926) internal successors, (129), 81 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:39,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:38:39,376 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2021-11-25 18:38:39,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 18:38:39,377 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.5925925925925926) internal successors, (129), 81 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-25 18:38:39,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:38:39,377 INFO L225 Difference]: With dead ends: 89 [2021-11-25 18:38:39,378 INFO L226 Difference]: Without dead ends: 86 [2021-11-25 18:38:39,379 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 111 SyntacticMatches, 18 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4572 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=907, Invalid=13373, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 18:38:39,380 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 2562 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 2729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 2562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:38:39,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 95 Invalid, 2729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 2562 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 18:38:39,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-25 18:38:39,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-11-25 18:38:39,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:39,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2021-11-25 18:38:39,404 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2021-11-25 18:38:39,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:38:39,405 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2021-11-25 18:38:39,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.5925925925925926) internal successors, (129), 81 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:39,405 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2021-11-25 18:38:39,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 18:38:39,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:38:39,406 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:38:39,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 18:38:39,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 18:38:39,623 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:38:39,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:38:39,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1684401310, now seen corresponding path program 25 times [2021-11-25 18:38:39,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:38:39,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51478539] [2021-11-25 18:38:39,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:38:39,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:38:39,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:39,885 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:38:39,885 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:38:39,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51478539] [2021-11-25 18:38:39,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51478539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:38:39,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285283944] [2021-11-25 18:38:39,885 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:38:39,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:39,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:38:39,889 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:38:39,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 18:38:40,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:40,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:38:40,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:38:40,288 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:38:40,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:38:40,394 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:38:40,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285283944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:38:40,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1839846789] [2021-11-25 18:38:40,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:38:40,396 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:38:40,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:38:40,396 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:38:40,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:38:40,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:40,435 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:38:40,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:38:40,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:40,469 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:38:40,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:38:40,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:40,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:38:40,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:40,537 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:38:40,559 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:38:40,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:38:40,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:38:40,721 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:38:40,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11884#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:38:40,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:38:40,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:38:40,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-25 18:38:40,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904834164] [2021-11-25 18:38:40,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:38:40,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:38:40,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:38:40,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:38:40,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1182, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:38:40,951 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:41,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:38:41,315 INFO L93 Difference]: Finished difference Result 152 states and 166 transitions. [2021-11-25 18:38:41,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:38:41,315 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 18:38:41,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:38:41,316 INFO L225 Difference]: With dead ends: 152 [2021-11-25 18:38:41,317 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 18:38:41,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=477, Invalid=1875, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:38:41,318 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:38:41,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 399 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:38:41,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 18:38:41,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-11-25 18:38:41,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:41,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2021-11-25 18:38:41,342 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 55 [2021-11-25 18:38:41,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:38:41,342 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2021-11-25 18:38:41,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:41,342 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2021-11-25 18:38:41,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 18:38:41,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:38:41,343 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:38:41,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 18:38:41,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:41,543 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:38:41,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:38:41,544 INFO L85 PathProgramCache]: Analyzing trace with hash -683963286, now seen corresponding path program 26 times [2021-11-25 18:38:41,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:38:41,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878979756] [2021-11-25 18:38:41,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:38:41,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:38:41,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:41,831 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:38:41,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:38:41,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878979756] [2021-11-25 18:38:41,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878979756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:38:41,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555462035] [2021-11-25 18:38:41,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:38:41,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:41,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:38:41,833 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:38:41,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 18:38:42,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:38:42,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:38:42,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:38:42,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:38:42,515 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:38:42,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:38:42,652 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:38:42,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555462035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:38:42,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1200091968] [2021-11-25 18:38:42,653 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:38:42,654 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:38:42,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:38:42,654 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:38:42,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:38:42,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:42,702 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:38:42,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:38:42,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:42,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:38:42,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:42,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:38:42,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:38:42,774 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:38:42,796 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:38:42,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:38:42,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:38:43,010 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:38:43,255 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12730#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:38:43,255 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:38:43,256 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:38:43,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-25 18:38:43,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756021671] [2021-11-25 18:38:43,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:38:43,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 18:38:43,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:38:43,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 18:38:43,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:38:43,262 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:43,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:38:43,736 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2021-11-25 18:38:43,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:38:43,736 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 18:38:43,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:38:43,737 INFO L225 Difference]: With dead ends: 105 [2021-11-25 18:38:43,737 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 18:38:43,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1147 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:38:43,738 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 405 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:38:43,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 9 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [405 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:38:43,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 18:38:43,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 18:38:43,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:43,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-11-25 18:38:43,753 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2021-11-25 18:38:43,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:38:43,753 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-11-25 18:38:43,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:38:43,753 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-11-25 18:38:43,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 18:38:43,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:38:43,754 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:38:43,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 18:38:43,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 18:38:43,967 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:38:43,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:38:43,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1634653959, now seen corresponding path program 27 times [2021-11-25 18:38:43,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:38:43,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373248214] [2021-11-25 18:38:43,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:38:43,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:38:44,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:38:49,269 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 10 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:38:49,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:38:49,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373248214] [2021-11-25 18:38:49,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373248214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:38:49,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926326752] [2021-11-25 18:38:49,269 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:38:49,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:38:49,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:38:49,271 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:38:49,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 18:38:49,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:38:49,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:38:49,407 WARN L261 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 167 conjunts are in the unsatisfiable core [2021-11-25 18:38:49,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:38:52,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:38:52,103 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:38:52,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 14 [2021-11-25 18:38:52,252 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 18:38:52,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:38:59,996 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-25 18:38:59,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 1116 [2021-11-25 18:39:38,987 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-25 18:39:38,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 65 [2021-11-25 18:39:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 18:39:39,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926326752] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:39:39,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701245588] [2021-11-25 18:39:39,177 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:39:39,178 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:39:39,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:39:39,178 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:39:39,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:39:39,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,216 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:39:39,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:39:39,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,250 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:39:39,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:39:39,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:39:39,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:39,347 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:39:39,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:39:39,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:39:39,488 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:39:40,159 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13513#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:39:40,159 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:39:40,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:39:40,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 26, 26] total 89 [2021-11-25 18:39:40,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952552728] [2021-11-25 18:39:40,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:39:40,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 18:39:40,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:39:40,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 18:39:40,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=8263, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 18:39:40,162 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 89 states, 89 states have (on average 1.5842696629213484) internal successors, (141), 89 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:47,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:39:47,497 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2021-11-25 18:39:47,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 18:39:47,498 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.5842696629213484) internal successors, (141), 89 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-25 18:39:47,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:39:47,499 INFO L225 Difference]: With dead ends: 97 [2021-11-25 18:39:47,499 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 18:39:47,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 117 SyntacticMatches, 24 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5414 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=1037, Invalid=15219, Unknown=0, NotChecked=0, Total=16256 [2021-11-25 18:39:47,501 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 2955 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 3123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 2955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:39:47,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 95 Invalid, 3123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 2955 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-25 18:39:47,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 18:39:47,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2021-11-25 18:39:47,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:47,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2021-11-25 18:39:47,536 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2021-11-25 18:39:47,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:39:47,537 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2021-11-25 18:39:47,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.5842696629213484) internal successors, (141), 89 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:47,537 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2021-11-25 18:39:47,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:39:47,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:39:47,538 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:39:47,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 18:39:47,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 18:39:47,751 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:39:47,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:39:47,752 INFO L85 PathProgramCache]: Analyzing trace with hash 639274816, now seen corresponding path program 28 times [2021-11-25 18:39:47,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:39:47,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002517390] [2021-11-25 18:39:47,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:39:47,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:39:47,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:39:48,053 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:39:48,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:39:48,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002517390] [2021-11-25 18:39:48,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002517390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:39:48,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298446090] [2021-11-25 18:39:48,054 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:39:48,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:39:48,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:39:48,055 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:39:48,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 18:39:48,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:39:48,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:39:48,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:39:48,668 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:39:48,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:39:48,783 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:39:48,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [298446090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:39:48,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796709029] [2021-11-25 18:39:48,785 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:39:48,785 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:39:48,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:39:48,785 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:39:48,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:39:48,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:48,828 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:39:48,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:39:48,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:48,854 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:39:48,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:39:48,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:48,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:39:48,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:48,913 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:39:48,934 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:39:48,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:39:48,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:39:49,098 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:39:49,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14326#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:39:49,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:39:49,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:39:49,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-25 18:39:49,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054783409] [2021-11-25 18:39:49,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:39:49,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 18:39:49,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:39:49,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 18:39:49,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:39:49,348 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:49,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:39:49,769 INFO L93 Difference]: Finished difference Result 166 states and 180 transitions. [2021-11-25 18:39:49,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:39:49,770 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 18:39:49,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:39:49,771 INFO L225 Difference]: With dead ends: 166 [2021-11-25 18:39:49,771 INFO L226 Difference]: Without dead ends: 85 [2021-11-25 18:39:49,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 668 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=561, Invalid=2195, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:39:49,773 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:39:49,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:39:49,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-25 18:39:49,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-11-25 18:39:49,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:49,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-11-25 18:39:49,793 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 60 [2021-11-25 18:39:49,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:39:49,793 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-11-25 18:39:49,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:49,794 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-11-25 18:39:49,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 18:39:49,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:39:49,795 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:39:49,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-25 18:39:49,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:39:49,995 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:39:49,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:39:49,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1893500104, now seen corresponding path program 29 times [2021-11-25 18:39:49,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:39:49,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130000950] [2021-11-25 18:39:49,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:39:49,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:39:50,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:39:50,334 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:39:50,335 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:39:50,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130000950] [2021-11-25 18:39:50,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130000950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:39:50,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672892535] [2021-11-25 18:39:50,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:39:50,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:39:50,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:39:50,344 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:39:50,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 18:39:50,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:39:50,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:39:50,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:39:50,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:39:51,352 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:39:51,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:39:51,539 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:39:51,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672892535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:39:51,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868140496] [2021-11-25 18:39:51,541 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:39:51,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:39:51,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:39:51,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:39:51,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:39:51,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:51,614 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:39:51,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:39:51,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:51,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:39:51,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:51,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:39:51,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:39:51,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:39:51,770 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:39:51,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:39:51,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:39:51,973 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:39:52,254 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15250#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:39:52,255 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:39:52,255 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:39:52,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2021-11-25 18:39:52,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064104433] [2021-11-25 18:39:52,255 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:39:52,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 18:39:52,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:39:52,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 18:39:52,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2331, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:39:52,257 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:52,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:39:52,893 INFO L93 Difference]: Finished difference Result 114 states and 126 transitions. [2021-11-25 18:39:52,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 18:39:52,894 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 18:39:52,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:39:52,894 INFO L225 Difference]: With dead ends: 114 [2021-11-25 18:39:52,894 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 18:39:52,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=817, Invalid=3473, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 18:39:52,895 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:39:52,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 11 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:39:52,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 18:39:52,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-25 18:39:52,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:52,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2021-11-25 18:39:52,913 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2021-11-25 18:39:52,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:39:52,913 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2021-11-25 18:39:52,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:39:52,913 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2021-11-25 18:39:52,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 18:39:52,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:39:52,914 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:39:52,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 18:39:53,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-25 18:39:53,115 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:39:53,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:39:53,116 INFO L85 PathProgramCache]: Analyzing trace with hash 2016228281, now seen corresponding path program 30 times [2021-11-25 18:39:53,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:39:53,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857205293] [2021-11-25 18:39:53,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:39:53,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:39:53,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:39:59,813 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 1 proven. 329 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:39:59,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:39:59,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857205293] [2021-11-25 18:39:59,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857205293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:39:59,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763285157] [2021-11-25 18:39:59,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:39:59,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:39:59,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:39:59,814 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:39:59,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 18:39:59,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:39:59,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:39:59,963 WARN L261 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 183 conjunts are in the unsatisfiable core [2021-11-25 18:39:59,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:40:03,119 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 18:40:03,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:40:13,866 WARN L227 SmtUtils]: Spent 6.54s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:40:13,868 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-25 18:40:13,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 1348 [2021-11-25 18:41:10,707 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-25 18:41:10,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 71 [2021-11-25 18:41:10,844 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 18:41:10,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763285157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:41:10,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1215678172] [2021-11-25 18:41:10,845 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:41:10,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:41:10,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:41:10,846 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:41:10,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:41:10,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:10,969 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:41:10,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:41:10,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:10,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:41:11,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:11,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:41:11,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:11,068 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:41:11,096 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:41:11,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:41:11,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:41:11,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:41:11,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16098#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:41:11,941 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:41:11,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:41:11,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 28, 28] total 94 [2021-11-25 18:41:11,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682548881] [2021-11-25 18:41:11,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:41:11,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-25 18:41:11,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:41:11,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-25 18:41:11,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=519, Invalid=9183, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 18:41:11,943 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 94 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:19,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:41:19,339 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-11-25 18:41:19,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 18:41:19,340 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 94 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 18:41:19,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:41:19,340 INFO L225 Difference]: With dead ends: 105 [2021-11-25 18:41:19,341 INFO L226 Difference]: Without dead ends: 102 [2021-11-25 18:41:19,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 125 SyntacticMatches, 31 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5337 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=1016, Invalid=15496, Unknown=0, NotChecked=0, Total=16512 [2021-11-25 18:41:19,342 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 3166 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 3365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 3166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:41:19,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 95 Invalid, 3365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 3166 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 18:41:19,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-25 18:41:19,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-11-25 18:41:19,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:19,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-11-25 18:41:19,366 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2021-11-25 18:41:19,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:41:19,367 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-11-25 18:41:19,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 94 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:19,367 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-11-25 18:41:19,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:41:19,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:41:19,368 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:41:19,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 18:41:19,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-25 18:41:19,571 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:41:19,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:41:19,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1335466398, now seen corresponding path program 31 times [2021-11-25 18:41:19,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:41:19,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111125901] [2021-11-25 18:41:19,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:41:19,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:41:19,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:41:19,920 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:41:19,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:41:19,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111125901] [2021-11-25 18:41:19,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111125901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:41:19,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94077241] [2021-11-25 18:41:19,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:41:19,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:41:19,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:41:19,923 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:41:19,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 18:41:20,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:41:20,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:41:20,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:41:20,446 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:41:20,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:41:20,561 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:41:20,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94077241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:41:20,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240838384] [2021-11-25 18:41:20,563 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:41:20,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:41:20,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:41:20,563 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:41:20,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:41:20,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,603 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:41:20,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:41:20,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,633 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:41:20,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:41:20,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:41:20,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:20,703 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:41:20,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:41:20,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:41:20,833 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:41:21,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16966#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:41:21,073 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:41:21,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:41:21,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2021-11-25 18:41:21,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251307391] [2021-11-25 18:41:21,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:41:21,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 18:41:21,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:41:21,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 18:41:21,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1576, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:41:21,075 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:21,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:41:21,483 INFO L93 Difference]: Finished difference Result 180 states and 194 transitions. [2021-11-25 18:41:21,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 18:41:21,483 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-25 18:41:21,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:41:21,487 INFO L225 Difference]: With dead ends: 180 [2021-11-25 18:41:21,488 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 18:41:21,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 771 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=652, Invalid=2540, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:41:21,490 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:41:21,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:41:21,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 18:41:21,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-25 18:41:21,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.0879120879120878) internal successors, (99), 91 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:21,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2021-11-25 18:41:21,512 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 65 [2021-11-25 18:41:21,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:41:21,512 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2021-11-25 18:41:21,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:21,512 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2021-11-25 18:41:21,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:41:21,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:41:21,513 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:41:21,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 18:41:21,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 18:41:21,713 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:41:21,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:41:21,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1449801066, now seen corresponding path program 32 times [2021-11-25 18:41:21,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:41:21,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128349242] [2021-11-25 18:41:21,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:41:21,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:41:21,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:41:22,081 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:41:22,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:41:22,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128349242] [2021-11-25 18:41:22,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128349242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:41:22,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337200062] [2021-11-25 18:41:22,082 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:41:22,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:41:22,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:41:22,083 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:41:22,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 18:41:22,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:41:22,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:41:22,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:41:22,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:41:22,997 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:41:22,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:41:23,176 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:41:23,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337200062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:41:23,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1956894692] [2021-11-25 18:41:23,181 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:41:23,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:41:23,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:41:23,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:41:23,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:41:23,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,223 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:41:23,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:41:23,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,262 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:41:23,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:41:23,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:41:23,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:41:23,346 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:41:23,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:41:23,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:41:23,513 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:41:23,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17968#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:41:23,846 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:41:23,846 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:41:23,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2021-11-25 18:41:23,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765363017] [2021-11-25 18:41:23,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:41:23,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 18:41:23,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:41:23,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 18:41:23,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=2701, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:41:23,849 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:24,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:41:24,464 INFO L93 Difference]: Finished difference Result 123 states and 135 transitions. [2021-11-25 18:41:24,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 18:41:24,470 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-25 18:41:24,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:41:24,471 INFO L225 Difference]: With dead ends: 123 [2021-11-25 18:41:24,471 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 18:41:24,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 166 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1584 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=948, Invalid=4022, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 18:41:24,472 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 498 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 498 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:41:24,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 7 Invalid, 924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [498 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:41:24,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 18:41:24,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-25 18:41:24,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:24,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-11-25 18:41:24,488 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2021-11-25 18:41:24,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:41:24,488 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-11-25 18:41:24,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:41:24,488 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-11-25 18:41:24,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 18:41:24,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:41:24,489 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:41:24,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 18:41:24,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:41:24,689 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:41:24,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:41:24,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1867121273, now seen corresponding path program 33 times [2021-11-25 18:41:24,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:41:24,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124797427] [2021-11-25 18:41:24,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:41:24,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:41:24,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:41:32,313 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:41:32,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:41:32,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124797427] [2021-11-25 18:41:32,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124797427] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:41:32,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860472342] [2021-11-25 18:41:32,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:41:32,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:41:32,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:41:32,314 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:41:32,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 18:41:32,491 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:41:32,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:41:32,495 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-25 18:41:32,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:41:36,075 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 18:41:36,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:41:49,740 WARN L227 SmtUtils]: Spent 8.71s on a formula simplification. DAG size of input: 1166 DAG size of output: 638 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:41:49,743 INFO L354 Elim1Store]: treesize reduction 2499, result has 38.6 percent of original size [2021-11-25 18:41:49,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 206 treesize of output 1602 [2021-11-25 18:43:06,868 INFO L354 Elim1Store]: treesize reduction 4023, result has 1.2 percent of original size [2021-11-25 18:43:06,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 77 [2021-11-25 18:43:07,134 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 18:43:07,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860472342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:07,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764983828] [2021-11-25 18:43:07,135 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:43:07,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:07,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:07,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:07,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:07,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,182 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:43:07,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:43:07,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:43:07,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:43:07,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:07,271 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:43:07,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:43:07,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:43:07,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:43:08,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18884#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:43:08,070 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:43:08,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:43:08,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 30, 30] total 102 [2021-11-25 18:43:08,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524118518] [2021-11-25 18:43:08,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:43:08,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2021-11-25 18:43:08,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:08,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-11-25 18:43:08,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=10735, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 18:43:08,072 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 102 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:16,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:16,671 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-11-25 18:43:16,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-25 18:43:16,672 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 102 states have internal predecessors, (162), 0 states have call successors, (0), 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 69 [2021-11-25 18:43:16,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:16,673 INFO L225 Difference]: With dead ends: 113 [2021-11-25 18:43:16,673 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 18:43:16,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 136 SyntacticMatches, 32 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5994 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=1126, Invalid=17506, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 18:43:16,675 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 3530 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 3678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 3530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:16,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 101 Invalid, 3678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 3530 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-11-25 18:43:16,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 18:43:16,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-25 18:43:16,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:16,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2021-11-25 18:43:16,744 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2021-11-25 18:43:16,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:16,744 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2021-11-25 18:43:16,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 102 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:16,744 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2021-11-25 18:43:16,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:43:16,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:16,745 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:16,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:16,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:16,945 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:16,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:16,946 INFO L85 PathProgramCache]: Analyzing trace with hash -888190272, now seen corresponding path program 34 times [2021-11-25 18:43:16,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:16,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359387483] [2021-11-25 18:43:16,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:16,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:16,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:17,308 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:43:17,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:17,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359387483] [2021-11-25 18:43:17,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359387483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:17,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073865535] [2021-11-25 18:43:17,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:43:17,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:17,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:17,311 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:17,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 18:43:17,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:17,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:43:17,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:17,937 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:43:17,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:18,117 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:43:18,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073865535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:18,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2123861931] [2021-11-25 18:43:18,119 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:43:18,119 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:18,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:18,119 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:18,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:18,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,166 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:43:18,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:43:18,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:43:18,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:43:18,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:18,257 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:43:18,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:43:18,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:43:18,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:43:18,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19815#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:43:18,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:43:18,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:43:18,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 18:43:18,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842237268] [2021-11-25 18:43:18,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:43:18,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:43:18,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:18,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:43:18,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1794, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:43:18,665 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:19,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:19,281 INFO L93 Difference]: Finished difference Result 194 states and 208 transitions. [2021-11-25 18:43:19,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 18:43:19,281 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 18:43:19,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:19,282 INFO L225 Difference]: With dead ends: 194 [2021-11-25 18:43:19,282 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 18:43:19,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=750, Invalid=2910, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:43:19,283 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:19,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 9 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:43:19,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 18:43:19,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-25 18:43:19,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:19,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2021-11-25 18:43:19,310 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 70 [2021-11-25 18:43:19,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:19,310 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2021-11-25 18:43:19,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:19,310 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2021-11-25 18:43:19,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:43:19,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:19,311 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:19,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:19,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 18:43:19,512 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:19,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:19,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1212440392, now seen corresponding path program 35 times [2021-11-25 18:43:19,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:19,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881714685] [2021-11-25 18:43:19,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:19,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:19,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:19,968 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:43:19,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:19,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881714685] [2021-11-25 18:43:19,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881714685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:19,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105880357] [2021-11-25 18:43:19,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:43:19,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:19,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:19,970 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:19,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 18:43:20,458 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:43:20,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:43:20,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:43:20,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:21,055 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:43:21,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:21,235 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:43:21,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105880357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:21,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620943008] [2021-11-25 18:43:21,237 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:43:21,237 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:21,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:21,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:21,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:21,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,280 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:43:21,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:43:21,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:43:21,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:43:21,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:43:21,376 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:43:21,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 18:43:21,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:43:21,515 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:43:21,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20895#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:43:21,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:43:21,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:43:21,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2021-11-25 18:43:21,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128135211] [2021-11-25 18:43:21,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:43:21,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 18:43:21,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:21,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 18:43:21,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=562, Invalid=3098, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:43:21,813 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:22,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:22,462 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2021-11-25 18:43:22,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 18:43:22,462 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-25 18:43:22,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:22,463 INFO L225 Difference]: With dead ends: 132 [2021-11-25 18:43:22,463 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 18:43:22,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 179 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1828 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1089, Invalid=4611, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 18:43:22,464 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:22,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 21 Invalid, 1146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:43:22,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 18:43:22,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-25 18:43:22,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:22,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-11-25 18:43:22,482 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2021-11-25 18:43:22,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:22,482 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-11-25 18:43:22,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:43:22,482 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-11-25 18:43:22,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 18:43:22,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:22,483 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:22,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:22,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 18:43:22,691 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:22,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:22,692 INFO L85 PathProgramCache]: Analyzing trace with hash -106164807, now seen corresponding path program 36 times [2021-11-25 18:43:22,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:22,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752448214] [2021-11-25 18:43:22,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:22,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:23,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:29,975 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 1 proven. 454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:29,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:29,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752448214] [2021-11-25 18:43:29,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752448214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:29,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318208905] [2021-11-25 18:43:29,976 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:43:29,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:29,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:30,004 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:30,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 18:43:30,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:43:30,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:43:30,202 WARN L261 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 215 conjunts are in the unsatisfiable core [2021-11-25 18:43:30,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:34,225 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-25 18:43:34,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:52,230 WARN L227 SmtUtils]: Spent 11.95s on a formula simplification. DAG size of input: 1367 DAG size of output: 743 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:43:52,232 INFO L354 Elim1Store]: treesize reduction 2954, result has 38.5 percent of original size [2021-11-25 18:43:52,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 223 treesize of output 1878 [2021-11-25 18:46:32,975 INFO L354 Elim1Store]: treesize reduction 4748, result has 1.1 percent of original size [2021-11-25 18:46:32,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 222 treesize of output 83 [2021-11-25 18:46:33,131 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-25 18:46:33,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318208905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:46:33,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845759672] [2021-11-25 18:46:33,133 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:46:33,133 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:46:33,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:46:33,134 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:46:33,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:46:33,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:33,168 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:46:33,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:46:33,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:33,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 18:46:33,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:33,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:46:33,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:33,233 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:46:33,251 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:46:33,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:46:33,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:46:33,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:46:34,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21879#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:46:34,174 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:46:34,174 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:46:34,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 32, 32] total 110 [2021-11-25 18:46:34,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116082764] [2021-11-25 18:46:34,174 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:46:34,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2021-11-25 18:46:34,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:34,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-11-25 18:46:34,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=662, Invalid=12448, Unknown=0, NotChecked=0, Total=13110 [2021-11-25 18:46:34,176 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 110 states, 110 states have (on average 1.5818181818181818) internal successors, (174), 110 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:43,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:43,664 INFO L93 Difference]: Finished difference Result 121 states and 128 transitions. [2021-11-25 18:46:43,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 18:46:43,664 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.5818181818181818) internal successors, (174), 110 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-25 18:46:43,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:43,665 INFO L225 Difference]: With dead ends: 121 [2021-11-25 18:46:43,665 INFO L226 Difference]: Without dead ends: 118 [2021-11-25 18:46:43,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 143 SyntacticMatches, 37 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7324 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=1289, Invalid=20763, Unknown=0, NotChecked=0, Total=22052 [2021-11-25 18:46:43,667 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 4535 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 4740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 4535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:43,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 119 Invalid, 4740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 4535 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-25 18:46:43,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-25 18:46:43,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 105. [2021-11-25 18:46:43,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:43,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2021-11-25 18:46:43,692 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2021-11-25 18:46:43,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:43,693 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2021-11-25 18:46:43,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.5818181818181818) internal successors, (174), 110 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:43,693 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2021-11-25 18:46:43,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:46:43,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:43,694 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:43,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-25 18:46:43,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:43,915 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:43,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:43,916 INFO L85 PathProgramCache]: Analyzing trace with hash 653420898, now seen corresponding path program 37 times [2021-11-25 18:46:43,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:43,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133016653] [2021-11-25 18:46:43,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:43,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:43,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:44,333 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:46:44,334 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:44,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133016653] [2021-11-25 18:46:44,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133016653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:44,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939215048] [2021-11-25 18:46:44,334 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:46:44,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:44,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:44,336 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:44,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 18:46:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:44,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 18:46:44,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:46:45,060 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:46:45,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:46:45,222 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:46:45,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939215048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:46:45,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608012790] [2021-11-25 18:46:45,224 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:46:45,224 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:46:45,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:46:45,224 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:46:45,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:46:45,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:45,269 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:46:45,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:46:45,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:45,298 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:46:45,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:46:45,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:45,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:46:45,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:45,359 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:46:45,378 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:46:45,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:46:45,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:46:45,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:46:45,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22881#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:46:45,766 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:46:45,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:46:45,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2021-11-25 18:46:45,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300064382] [2021-11-25 18:46:45,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:46:45,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 18:46:45,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:45,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 18:46:45,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=524, Invalid=2026, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 18:46:45,768 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:46,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:46,319 INFO L93 Difference]: Finished difference Result 208 states and 222 transitions. [2021-11-25 18:46:46,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 18:46:46,320 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-25 18:46:46,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:46,320 INFO L225 Difference]: With dead ends: 208 [2021-11-25 18:46:46,321 INFO L226 Difference]: Without dead ends: 106 [2021-11-25 18:46:46,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 998 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=855, Invalid=3305, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 18:46:46,322 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:46,322 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 19 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:46:46,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-25 18:46:46,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-11-25 18:46:46,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0761904761904761) internal successors, (113), 105 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:46,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 113 transitions. [2021-11-25 18:46:46,350 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 113 transitions. Word has length 75 [2021-11-25 18:46:46,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:46,351 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 113 transitions. [2021-11-25 18:46:46,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:46,351 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 113 transitions. [2021-11-25 18:46:46,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 18:46:46,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:46,351 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:46,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 18:46:46,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 18:46:46,552 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:46,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:46,552 INFO L85 PathProgramCache]: Analyzing trace with hash -119206294, now seen corresponding path program 38 times [2021-11-25 18:46:46,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:46,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056207459] [2021-11-25 18:46:46,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:46,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:46,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:46,971 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-25 18:46:46,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:46,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056207459] [2021-11-25 18:46:46,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056207459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:46,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387492816] [2021-11-25 18:46:46,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:46:46,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:46,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:46,973 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:46,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 18:46:47,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:46:47,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:46:47,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 18:46:47,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:46:47,989 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-25 18:46:47,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:46:48,142 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-25 18:46:48,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387492816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:46:48,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663423472] [2021-11-25 18:46:48,143 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:46:48,143 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:46:48,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:46:48,144 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:46:48,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:46:48,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:48,184 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 18:46:48,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 18:46:48,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:48,216 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 18:46:48,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 18:46:48,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:48,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:46:48,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:46:48,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:46:48,289 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:46:48,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 18:46:48,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:46:48,423 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:46:48,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24039#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:46:48,658 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:46:48,658 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:46:48,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2021-11-25 18:46:48,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715936914] [2021-11-25 18:46:48,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:46:48,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-25 18:46:48,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:48,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-25 18:46:48,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=3522, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 18:46:48,660 INFO L87 Difference]: Start difference. First operand 106 states and 113 transitions. Second operand has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:49,282 INFO L93 Difference]: Finished difference Result 141 states and 153 transitions. [2021-11-25 18:46:49,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 18:46:49,283 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 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 76 [2021-11-25 18:46:49,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:49,283 INFO L225 Difference]: With dead ends: 141 [2021-11-25 18:46:49,283 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 18:46:49,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2089 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1240, Invalid=5240, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 18:46:49,284 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 590 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 590 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:49,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 9 Invalid, 1138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [590 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:46:49,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 18:46:49,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-25 18:46:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:49,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-11-25 18:46:49,303 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2021-11-25 18:46:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:49,304 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-11-25 18:46:49,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:49,304 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-11-25 18:46:49,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:46:49,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:49,304 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:49,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-25 18:46:49,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 18:46:49,505 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:49,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:49,505 INFO L85 PathProgramCache]: Analyzing trace with hash -906808313, now seen corresponding path program 39 times [2021-11-25 18:46:49,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:49,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011885302] [2021-11-25 18:46:49,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:49,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:49,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:56,679 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:46:56,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:56,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011885302] [2021-11-25 18:46:56,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011885302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:56,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166345107] [2021-11-25 18:46:56,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:46:56,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:56,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:56,681 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:56,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22a560c9-e301-46e4-b8b4-077da7385b36/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 18:46:56,846 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:46:56,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:46:56,850 WARN L261 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 231 conjunts are in the unsatisfiable core [2021-11-25 18:46:56,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:00,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:00,873 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:47:00,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 14 [2021-11-25 18:47:01,038 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-25 18:47:01,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:22,315 WARN L227 SmtUtils]: Spent 14.83s on a formula simplification. DAG size of input: 1584 DAG size of output: 856 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:47:22,318 INFO L354 Elim1Store]: treesize reduction 3447, result has 38.3 percent of original size [2021-11-25 18:47:22,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 28 select indices, 28 select index equivalence classes, 0 disjoint index pairs (out of 378 index pairs), introduced 28 new quantified variables, introduced 378 case distinctions, treesize of input 239 treesize of output 2175