./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/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_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/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_617f25eb-8c1e-4a8a-9114-f85e20bae09f/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 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:47:48,045 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:47:48,048 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:47:48,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:47:48,105 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:47:48,107 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:47:48,111 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:47:48,116 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:47:48,122 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:47:48,123 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:47:48,125 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:47:48,128 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:47:48,129 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:47:48,137 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:47:48,139 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:47:48,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:47:48,146 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:47:48,149 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:47:48,151 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:47:48,157 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:47:48,164 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:47:48,166 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:47:48,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:47:48,169 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:47:48,173 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:47:48,175 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:47:48,176 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:47:48,177 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:47:48,178 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:47:48,180 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:47:48,181 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:47:48,182 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:47:48,184 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:47:48,185 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:47:48,187 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:47:48,187 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:47:48,188 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:47:48,188 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:47:48,189 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:47:48,189 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:47:48,190 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:47:48,191 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:47:48,246 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:47:48,247 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:47:48,247 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:47:48,248 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:47:48,254 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:47:48,255 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:47:48,255 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:47:48,255 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:47:48,256 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:47:48,256 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:47:48,257 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:47:48,257 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:47:48,257 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:47:48,258 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:47:48,258 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:47:48,258 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:47:48,258 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:47:48,259 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:47:48,259 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:47:48,260 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:47:48,260 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:47:48,260 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:47:48,260 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:47:48,261 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:47:48,261 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:47:48,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:47:48,261 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:47:48,261 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:47:48,262 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:47:48,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:47:48,262 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:47:48,263 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:47:48,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:48,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:47:48,263 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:47:48,264 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:47:48,264 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:47:48,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:47:48,264 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:47:48,264 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:47:48,265 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:47:48,265 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_617f25eb-8c1e-4a8a-9114-f85e20bae09f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 [2021-11-25 18:47:48,538 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:47:48,559 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:47:48,561 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:47:48,563 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:47:48,568 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:47:48,569 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2021-11-25 18:47:48,660 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/data/ce277a1b8/e3a9a9b69b8943268b82ff745946dfc8/FLAG23c85380c [2021-11-25 18:47:49,067 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:47:49,068 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2021-11-25 18:47:49,074 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/data/ce277a1b8/e3a9a9b69b8943268b82ff745946dfc8/FLAG23c85380c [2021-11-25 18:47:49,458 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/data/ce277a1b8/e3a9a9b69b8943268b82ff745946dfc8 [2021-11-25 18:47:49,460 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:47:49,461 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:47:49,470 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:49,470 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:47:49,474 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:47:49,474 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,476 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33456de7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49, skipping insertion in model container [2021-11-25 18:47:49,476 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,486 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:47:49,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:47:49,670 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_617f25eb-8c1e-4a8a-9114-f85e20bae09f/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2021-11-25 18:47:49,687 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:49,699 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:47:49,721 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_617f25eb-8c1e-4a8a-9114-f85e20bae09f/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2021-11-25 18:47:49,733 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:49,750 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:47:49,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49 WrapperNode [2021-11-25 18:47:49,751 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:49,752 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:49,752 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:47:49,752 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:47:49,760 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,768 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,790 INFO L137 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-25 18:47:49,791 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:49,792 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:47:49,792 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:47:49,792 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:47:49,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,813 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,832 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,834 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,836 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:47:49,837 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:47:49,838 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:47:49,838 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:47:49,839 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (1/1) ... [2021-11-25 18:47:49,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:49,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:49,873 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:47:49,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:47:49,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:47:49,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:47:49,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:47:49,921 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:47:49,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:47:49,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:47:49,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:47:49,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:47:49,995 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:47:49,996 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:47:50,119 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:47:50,148 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:47:50,148 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:47:50,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:50 BoogieIcfgContainer [2021-11-25 18:47:50,150 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:47:50,169 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:47:50,169 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:47:50,176 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:47:50,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:47:49" (1/3) ... [2021-11-25 18:47:50,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e82e03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:50, skipping insertion in model container [2021-11-25 18:47:50,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:49" (2/3) ... [2021-11-25 18:47:50,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e82e03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:50, skipping insertion in model container [2021-11-25 18:47:50,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:50" (3/3) ... [2021-11-25 18:47:50,180 INFO L111 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2021-11-25 18:47:50,185 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:47:50,200 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:47:50,260 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:47:50,270 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 18:47:50,270 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:47:50,283 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:50,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:47:50,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:50,289 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:47:50,289 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:50,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:50,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1969782628, now seen corresponding path program 1 times [2021-11-25 18:47:50,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:50,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783211089] [2021-11-25 18:47:50,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:50,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:50,513 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 18:47:50,513 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:50,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783211089] [2021-11-25 18:47:50,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783211089] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:47:50,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:47:50,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:47:50,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218006] [2021-11-25 18:47:50,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:47:50,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:47:50,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:50,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:47:50,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:47:50,569 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:50,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:50,607 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-25 18:47:50,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:47:50,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:47:50,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:50,617 INFO L225 Difference]: With dead ends: 18 [2021-11-25 18:47:50,617 INFO L226 Difference]: Without dead ends: 9 [2021-11-25 18:47:50,620 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 18:47:50,624 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:50,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:50,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-25 18:47:50,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-25 18:47:50,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:50,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-25 18:47:50,655 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-25 18:47:50,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:50,655 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-25 18:47:50,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:50,656 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-25 18:47:50,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:47:50,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:50,657 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:50,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:47:50,657 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:50,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:50,658 INFO L85 PathProgramCache]: Analyzing trace with hash -968964990, now seen corresponding path program 1 times [2021-11-25 18:47:50,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:50,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483982987] [2021-11-25 18:47:50,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:50,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:50,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:50,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:50,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:50,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483982987] [2021-11-25 18:47:50,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483982987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:50,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26985167] [2021-11-25 18:47:50,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:50,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:50,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:50,845 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:50,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:47:50,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:50,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:47:50,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:50,971 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 11 treesize of output 7 [2021-11-25 18:47:51,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:51,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:51,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-25 18:47:51,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-25 18:47:51,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:51,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26985167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:51,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [263004986] [2021-11-25 18:47:51,139 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:47:51,139 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:51,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:51,149 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:51,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:51,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,218 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:51,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:51,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:47:51,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:51,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,375 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:51,376 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 202 treesize of output 199 [2021-11-25 18:47:51,467 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 18 treesize of output 14 [2021-11-25 18:47:51,535 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:51,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:51,888 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:51,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:51,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-11-25 18:47:51,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850859331] [2021-11-25 18:47:51,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:51,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 18:47:51,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:51,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 18:47:51,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:47:51,891 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:51,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:51,976 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-25 18:47:51,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:47:51,976 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:47:51,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:51,977 INFO L225 Difference]: With dead ends: 15 [2021-11-25 18:47:51,977 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 18:47:51,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:47:51,980 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:51,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:51,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 18:47:51,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2021-11-25 18:47:51,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:51,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-25 18:47:51,984 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2021-11-25 18:47:51,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:51,985 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-25 18:47:51,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:51,985 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-25 18:47:51,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:47:51,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:51,986 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:52,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:52,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 18:47:52,212 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:52,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:52,213 INFO L85 PathProgramCache]: Analyzing trace with hash 43972795, now seen corresponding path program 1 times [2021-11-25 18:47:52,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:52,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276472297] [2021-11-25 18:47:52,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:52,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:52,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:52,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:52,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276472297] [2021-11-25 18:47:52,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276472297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:52,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149418255] [2021-11-25 18:47:52,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:52,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:52,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:52,285 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:52,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:47:52,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:52,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:47:52,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:52,401 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:52,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:52,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:52,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149418255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:52,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133324132] [2021-11-25 18:47:52,436 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:52,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:52,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:52,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:52,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:52,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,480 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:52,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:52,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:47:52,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:52,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:52,638 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:52,639 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 202 treesize of output 199 [2021-11-25 18:47:52,709 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 18 treesize of output 14 [2021-11-25 18:47:52,822 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:53,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:53,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:53,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:53,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-11-25 18:47:53,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128545901] [2021-11-25 18:47:53,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:53,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 18:47:53,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:53,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 18:47:53,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:47:53,079 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:53,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:53,134 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-25 18:47:53,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:47:53,135 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 18:47:53,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:53,137 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:47:53,137 INFO L226 Difference]: Without dead ends: 18 [2021-11-25 18:47:53,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:47:53,142 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:53,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 17 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:53,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-25 18:47:53,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2021-11-25 18:47:53,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:53,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-25 18:47:53,151 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2021-11-25 18:47:53,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:53,151 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-25 18:47:53,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:53,152 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-25 18:47:53,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:47:53,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:53,155 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:53,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:53,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:53,369 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:53,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:53,370 INFO L85 PathProgramCache]: Analyzing trace with hash -812263007, now seen corresponding path program 2 times [2021-11-25 18:47:53,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:53,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555757174] [2021-11-25 18:47:53,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:53,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:53,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:53,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:53,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:53,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555757174] [2021-11-25 18:47:53,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555757174] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:53,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018329428] [2021-11-25 18:47:53,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:47:53,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:53,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:53,544 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:53,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:47:53,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:47:53,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:53,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:47:53,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:53,629 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 15 treesize of output 11 [2021-11-25 18:47:53,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:47:53,781 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:53,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:53,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:53,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:53,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:53,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:53,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:53,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018329428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:53,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413555390] [2021-11-25 18:47:53,902 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:53,902 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:53,903 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:53,903 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:53,903 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:53,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:53,946 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:47:53,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:47:53,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:53,976 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:53,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:54,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:54,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,086 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:54,087 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 202 treesize of output 199 [2021-11-25 18:47:54,138 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 18 treesize of output 14 [2021-11-25 18:47:54,266 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:54,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:54,599 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:54,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:54,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2021-11-25 18:47:54,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373907475] [2021-11-25 18:47:54,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:54,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:47:54,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:54,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:47:54,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:47:54,601 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 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 18:47:54,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:54,738 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-25 18:47:54,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:47:54,739 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 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 11 [2021-11-25 18:47:54,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:54,739 INFO L225 Difference]: With dead ends: 19 [2021-11-25 18:47:54,739 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 18:47:54,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:47:54,741 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:54,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:54,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 18:47:54,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-11-25 18:47:54,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:54,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-25 18:47:54,748 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-11-25 18:47:54,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:54,749 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-25 18:47:54,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 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 18:47:54,749 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-25 18:47:54,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:47:54,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:54,750 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 18:47:54,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 18:47:54,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:54,968 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:54,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:54,968 INFO L85 PathProgramCache]: Analyzing trace with hash -276702404, now seen corresponding path program 3 times [2021-11-25 18:47:54,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:54,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113734552] [2021-11-25 18:47:54,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:54,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:54,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:55,038 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:55,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:55,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113734552] [2021-11-25 18:47:55,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113734552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:55,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432629740] [2021-11-25 18:47:55,039 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:47:55,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:55,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:55,040 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:55,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:47:55,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:47:55,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:55,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:47:55,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:55,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:55,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:55,211 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:55,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432629740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:55,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577255065] [2021-11-25 18:47:55,214 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:55,214 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:55,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:55,215 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:55,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:55,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,253 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:55,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:55,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:47:55,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:55,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:55,350 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:55,351 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 202 treesize of output 199 [2021-11-25 18:47:55,398 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 18 treesize of output 14 [2021-11-25 18:47:55,472 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:55,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '492#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:55,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:55,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:55,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-25 18:47:55,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859278877] [2021-11-25 18:47:55,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:55,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 18:47:55,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:55,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 18:47:55,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:47:55,809 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:55,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:55,877 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-25 18:47:55,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:47:55,878 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 18:47:55,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:55,878 INFO L225 Difference]: With dead ends: 34 [2021-11-25 18:47:55,878 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 18:47:55,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:47:55,880 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:55,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 33 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:55,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 18:47:55,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2021-11-25 18:47:55,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:55,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-25 18:47:55,884 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-11-25 18:47:55,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:55,885 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-25 18:47:55,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:55,885 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-25 18:47:55,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:47:55,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:55,886 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 18:47:55,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:56,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:56,100 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:56,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:56,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1296967390, now seen corresponding path program 4 times [2021-11-25 18:47:56,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:56,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405942665] [2021-11-25 18:47:56,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:56,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:56,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:56,242 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:56,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:56,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405942665] [2021-11-25 18:47:56,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405942665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:56,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115666745] [2021-11-25 18:47:56,244 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:47:56,244 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:56,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:56,256 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:56,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:47:56,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:56,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 18:47:56,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:56,327 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 15 treesize of output 11 [2021-11-25 18:47:56,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:47:56,495 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:56,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:56,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:56,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:56,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:56,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:56,649 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:56,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115666745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:56,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1952807498] [2021-11-25 18:47:56,652 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:56,652 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:56,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:56,653 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:56,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:56,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,685 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:47:56,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:47:56,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,716 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:56,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:56,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:56,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,845 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:56,846 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 202 treesize of output 199 [2021-11-25 18:47:56,922 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 18 treesize of output 14 [2021-11-25 18:47:57,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:57,428 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '668#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:57,429 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:57,429 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:57,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 14 [2021-11-25 18:47:57,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944311018] [2021-11-25 18:47:57,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:57,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:47:57,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:57,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:47:57,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:47:57,431 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:57,598 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-11-25 18:47:57,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:47:57,598 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 18:47:57,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:57,599 INFO L225 Difference]: With dead ends: 23 [2021-11-25 18:47:57,599 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 18:47:57,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 27 SyntacticMatches, 9 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:47:57,601 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:57,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 36 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:57,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 18:47:57,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-11-25 18:47:57,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-25 18:47:57,605 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-11-25 18:47:57,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:57,606 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-25 18:47:57,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,606 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-25 18:47:57,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 18:47:57,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:57,607 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 18:47:57,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:57,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:57,820 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:57,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:57,820 INFO L85 PathProgramCache]: Analyzing trace with hash -424927205, now seen corresponding path program 5 times [2021-11-25 18:47:57,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:57,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395592881] [2021-11-25 18:47:57,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:57,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:57,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:57,945 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:57,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:57,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395592881] [2021-11-25 18:47:57,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395592881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:57,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632965984] [2021-11-25 18:47:57,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:47:57,946 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:57,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:57,947 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:57,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:47:58,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:47:58,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:58,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:47:58,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:58,104 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:58,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:58,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632965984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:58,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [267078375] [2021-11-25 18:47:58,147 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:58,148 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:58,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:58,148 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:58,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:58,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,177 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:58,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:58,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:47:58,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:47:58,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,263 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:47:58,264 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 202 treesize of output 199 [2021-11-25 18:47:58,309 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 18 treesize of output 14 [2021-11-25 18:47:58,415 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:58,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '862#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:58,734 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:58,735 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:58,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-25 18:47:58,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409330581] [2021-11-25 18:47:58,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:58,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:47:58,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:58,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:47:58,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:47:58,738 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:58,829 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-25 18:47:58,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:47:58,829 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-25 18:47:58,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:58,831 INFO L225 Difference]: With dead ends: 41 [2021-11-25 18:47:58,832 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 18:47:58,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:47:58,834 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 32 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:58,835 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 32 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:58,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 18:47:58,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2021-11-25 18:47:58,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 18:47:58,845 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-11-25 18:47:58,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:58,845 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 18:47:58,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,846 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 18:47:58,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 18:47:58,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:58,847 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 18:47:58,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:59,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 18:47:59,068 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:59,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:59,069 INFO L85 PathProgramCache]: Analyzing trace with hash 1950268161, now seen corresponding path program 6 times [2021-11-25 18:47:59,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:59,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985119142] [2021-11-25 18:47:59,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:59,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:59,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:59,264 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:59,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:59,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985119142] [2021-11-25 18:47:59,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985119142] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:59,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980802023] [2021-11-25 18:47:59,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:47:59,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:59,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:59,268 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:59,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:47:59,321 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:47:59,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:59,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:47:59,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:59,358 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 15 treesize of output 11 [2021-11-25 18:47:59,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:47:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:59,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:59,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:59,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:59,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:47:59,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:47:59,740 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:59,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980802023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:59,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [486068518] [2021-11-25 18:47:59,745 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:47:59,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:59,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:59,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:59,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:59,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,776 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:47:59,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:47:59,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,801 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:47:59,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:47:59,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:47:59,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:59,896 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:47:59,897 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 195 treesize of output 198 [2021-11-25 18:47:59,950 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 18 treesize of output 14 [2021-11-25 18:48:00,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:00,298 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1083#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:00,299 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:00,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:00,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 17 [2021-11-25 18:48:00,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412817936] [2021-11-25 18:48:00,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:00,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:48:00,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:00,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:48:00,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=404, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:48:00,301 INFO L87 Difference]: Start difference. First operand 20 states and 21 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 18:48:00,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:00,529 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-11-25 18:48:00,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:48:00,530 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 19 [2021-11-25 18:48:00,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:00,530 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:48:00,530 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 18:48:00,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:48:00,532 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:00,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 52 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:00,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 18:48:00,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-11-25 18:48:00,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:00,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-25 18:48:00,537 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2021-11-25 18:48:00,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:00,537 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-25 18:48:00,537 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 18:48:00,537 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-25 18:48:00,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 18:48:00,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:00,538 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 18:48:00,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:00,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:00,739 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:00,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:00,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1874002468, now seen corresponding path program 7 times [2021-11-25 18:48:00,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:00,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493092312] [2021-11-25 18:48:00,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:00,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:00,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:00,862 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:00,862 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:00,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493092312] [2021-11-25 18:48:00,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493092312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:00,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841259605] [2021-11-25 18:48:00,863 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:00,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:00,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:00,866 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:00,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:48:00,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:00,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:48:00,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:01,061 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:01,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:01,128 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:01,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841259605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:01,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677981250] [2021-11-25 18:48:01,130 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:01,130 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:01,130 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:01,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:01,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:01,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,158 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:01,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:01,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,180 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:01,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:01,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:01,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,244 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:01,278 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:01,279 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 195 treesize of output 198 [2021-11-25 18:48:01,349 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 18 treesize of output 14 [2021-11-25 18:48:01,420 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:01,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1318#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:01,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:01,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:01,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 18:48:01,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683707942] [2021-11-25 18:48:01,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:01,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:48:01,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:01,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:48:01,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:48:01,663 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:01,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:01,773 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-25 18:48:01,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:48:01,774 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 18:48:01,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:01,775 INFO L225 Difference]: With dead ends: 48 [2021-11-25 18:48:01,775 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:48:01,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:48:01,777 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 36 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:01,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 37 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:01,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:48:01,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-25 18:48:01,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:01,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-25 18:48:01,784 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-11-25 18:48:01,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:01,784 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-25 18:48:01,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:01,785 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-25 18:48:01,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 18:48:01,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:01,786 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 18:48:01,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-25 18:48:02,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:02,000 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:02,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:02,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1951681086, now seen corresponding path program 8 times [2021-11-25 18:48:02,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:02,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787278098] [2021-11-25 18:48:02,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:02,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:02,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:02,261 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:02,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:02,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787278098] [2021-11-25 18:48:02,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787278098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:02,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212621525] [2021-11-25 18:48:02,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:02,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:02,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:02,262 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:02,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:48:02,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:48:02,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:02,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 18:48:02,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:02,371 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 15 treesize of output 11 [2021-11-25 18:48:02,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:02,665 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:02,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:02,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:02,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:02,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:02,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:02,862 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:02,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212621525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:02,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832043454] [2021-11-25 18:48:02,865 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:02,865 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:02,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:02,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:02,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:02,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,898 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:02,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:02,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:02,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:02,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,965 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:02,987 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:02,987 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 195 treesize of output 198 [2021-11-25 18:48:03,052 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 18 treesize of output 14 [2021-11-25 18:48:03,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:03,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1584#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:03,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:03,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:03,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 20 [2021-11-25 18:48:03,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544387544] [2021-11-25 18:48:03,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:03,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:48:03,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:03,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:48:03,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=534, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:48:03,362 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 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 18:48:03,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:03,647 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-11-25 18:48:03,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 18:48:03,647 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 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 23 [2021-11-25 18:48:03,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:03,648 INFO L225 Difference]: With dead ends: 31 [2021-11-25 18:48:03,648 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 18:48:03,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:48:03,650 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 15 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:03,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 75 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:03,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 18:48:03,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-11-25 18:48:03,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:03,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-25 18:48:03,656 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-11-25 18:48:03,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:03,656 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-25 18:48:03,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 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 18:48:03,657 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-25 18:48:03,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:48:03,657 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:03,658 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1] [2021-11-25 18:48:03,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:03,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:03,883 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:03,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:03,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1554153605, now seen corresponding path program 9 times [2021-11-25 18:48:03,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:03,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067322328] [2021-11-25 18:48:03,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:03,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:03,994 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:03,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:03,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067322328] [2021-11-25 18:48:03,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067322328] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:03,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908174210] [2021-11-25 18:48:03,995 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:03,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:03,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:03,996 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:04,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:48:04,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:04,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:04,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:48:04,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:04,225 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:04,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:04,280 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:04,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908174210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:04,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150319014] [2021-11-25 18:48:04,282 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:04,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:04,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:04,283 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:04,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:04,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,310 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:04,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:04,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:04,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:04,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,393 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:04,394 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 202 treesize of output 199 [2021-11-25 18:48:04,432 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 18 treesize of output 14 [2021-11-25 18:48:04,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:04,903 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1860#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:04,903 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:04,903 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:04,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-25 18:48:04,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419150903] [2021-11-25 18:48:04,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:04,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 18:48:04,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:04,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 18:48:04,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:48:04,905 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 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 18:48:05,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:05,031 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-25 18:48:05,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:48:05,032 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 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 26 [2021-11-25 18:48:05,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:05,033 INFO L225 Difference]: With dead ends: 55 [2021-11-25 18:48:05,033 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 18:48:05,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:48:05,034 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 44 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:05,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 59 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:05,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 18:48:05,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2021-11-25 18:48:05,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 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 18:48:05,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-11-25 18:48:05,040 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2021-11-25 18:48:05,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:05,041 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-11-25 18:48:05,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 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 18:48:05,041 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-11-25 18:48:05,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:48:05,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:05,042 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-25 18:48:05,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:05,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:48:05,260 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:05,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:05,260 INFO L85 PathProgramCache]: Analyzing trace with hash -550382495, now seen corresponding path program 10 times [2021-11-25 18:48:05,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:05,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068603344] [2021-11-25 18:48:05,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:05,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:05,489 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:05,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:05,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068603344] [2021-11-25 18:48:05,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068603344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:05,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913339333] [2021-11-25 18:48:05,489 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:05,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:05,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:05,490 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:05,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:48:05,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:05,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 18:48:05,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:05,600 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 15 treesize of output 11 [2021-11-25 18:48:05,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:05,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:06,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:06,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:06,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:06,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:06,153 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:06,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913339333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:06,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634721929] [2021-11-25 18:48:06,155 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:06,155 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:06,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:06,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:06,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:06,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,194 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:06,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:06,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:06,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:06,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,279 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:06,280 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 202 treesize of output 199 [2021-11-25 18:48:06,318 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 18 treesize of output 14 [2021-11-25 18:48:06,388 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:06,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2171#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:06,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:06,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:06,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 23 [2021-11-25 18:48:06,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048982594] [2021-11-25 18:48:06,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:06,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:48:06,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:06,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:48:06,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=682, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:48:06,826 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 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 18:48:07,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:07,202 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2021-11-25 18:48:07,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:48:07,202 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 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 27 [2021-11-25 18:48:07,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:07,203 INFO L225 Difference]: With dead ends: 35 [2021-11-25 18:48:07,203 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 18:48:07,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 57 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=136, Invalid=1196, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:48:07,204 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:07,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 120 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:07,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 18:48:07,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-11-25 18:48:07,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:07,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-25 18:48:07,210 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2021-11-25 18:48:07,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:07,211 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-25 18:48:07,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 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 18:48:07,211 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-25 18:48:07,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:48:07,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:07,212 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2021-11-25 18:48:07,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:07,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 18:48:07,413 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:07,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:07,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1745021052, now seen corresponding path program 11 times [2021-11-25 18:48:07,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:07,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372869361] [2021-11-25 18:48:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:07,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:07,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:07,541 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:07,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:07,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372869361] [2021-11-25 18:48:07,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372869361] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:07,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965555220] [2021-11-25 18:48:07,542 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:07,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:07,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:07,543 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:07,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:48:07,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:48:07,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:07,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:48:07,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:07,858 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:07,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:07,934 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:07,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965555220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:07,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2082219607] [2021-11-25 18:48:07,936 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:07,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:07,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:07,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:07,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:07,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:07,965 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:07,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:07,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:07,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:07,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:07,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:08,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:08,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:08,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:08,048 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:08,052 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 202 treesize of output 199 [2021-11-25 18:48:08,085 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 18 treesize of output 14 [2021-11-25 18:48:08,169 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:08,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2488#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:08,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:08,513 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:08,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-25 18:48:08,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763374149] [2021-11-25 18:48:08,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:08,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 18:48:08,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:08,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 18:48:08,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:48:08,515 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:08,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:08,643 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-25 18:48:08,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:48:08,652 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-25 18:48:08,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:08,653 INFO L225 Difference]: With dead ends: 62 [2021-11-25 18:48:08,653 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 18:48:08,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 69 SyntacticMatches, 7 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:48:08,655 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 52 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:08,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 51 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:08,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 18:48:08,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2021-11-25 18:48:08,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:08,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-25 18:48:08,661 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2021-11-25 18:48:08,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:08,661 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-25 18:48:08,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:08,661 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-25 18:48:08,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 18:48:08,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:08,663 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-25 18:48:08,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:08,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:08,872 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:08,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:08,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1177967202, now seen corresponding path program 12 times [2021-11-25 18:48:08,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:08,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224275714] [2021-11-25 18:48:08,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:08,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:08,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:09,144 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:09,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:09,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224275714] [2021-11-25 18:48:09,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224275714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:09,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307466996] [2021-11-25 18:48:09,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:09,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:09,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:09,146 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:09,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:48:09,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:09,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:09,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 18:48:09,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:09,249 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 15 treesize of output 11 [2021-11-25 18:48:09,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:09,592 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:09,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:09,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:09,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:09,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:09,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:09,818 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:09,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307466996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:09,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106262861] [2021-11-25 18:48:09,820 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:09,820 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:09,820 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:09,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:09,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:09,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:09,844 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:09,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:09,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:09,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:09,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:09,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:09,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:09,917 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:09,938 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:09,938 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 195 treesize of output 198 [2021-11-25 18:48:09,976 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 18 treesize of output 14 [2021-11-25 18:48:10,050 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:10,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2844#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:10,306 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:10,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:10,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 26 [2021-11-25 18:48:10,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799771351] [2021-11-25 18:48:10,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:10,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 18:48:10,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:10,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 18:48:10,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:48:10,309 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 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 18:48:10,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:10,696 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-11-25 18:48:10,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 18:48:10,696 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 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) Word has length 31 [2021-11-25 18:48:10,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:10,697 INFO L225 Difference]: With dead ends: 39 [2021-11-25 18:48:10,697 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 18:48:10,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:48:10,698 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:10,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 133 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:10,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 18:48:10,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-11-25 18:48:10,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:10,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-25 18:48:10,704 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2021-11-25 18:48:10,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:10,704 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-25 18:48:10,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 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 18:48:10,705 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-25 18:48:10,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:48:10,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:10,705 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2021-11-25 18:48:10,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:10,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:48:10,908 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:10,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:10,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1352067365, now seen corresponding path program 13 times [2021-11-25 18:48:10,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:10,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389670136] [2021-11-25 18:48:10,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:10,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:10,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:11,053 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:11,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:11,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389670136] [2021-11-25 18:48:11,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389670136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:11,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155774644] [2021-11-25 18:48:11,054 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:11,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:11,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:11,056 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:11,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:48:11,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:11,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:48:11,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:11,356 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:11,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:11,441 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:11,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155774644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:11,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [462524813] [2021-11-25 18:48:11,443 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:11,443 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:11,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:11,443 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:11,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:11,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,470 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:11,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:11,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:11,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:11,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,554 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:11,555 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 202 treesize of output 199 [2021-11-25 18:48:11,587 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 18 treesize of output 14 [2021-11-25 18:48:11,653 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:11,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3202#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:11,879 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:11,879 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:11,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-25 18:48:11,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29340761] [2021-11-25 18:48:11,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:11,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 18:48:11,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:11,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 18:48:11,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:48:11,881 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:12,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:12,049 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-11-25 18:48:12,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:48:12,049 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 18:48:12,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:12,050 INFO L225 Difference]: With dead ends: 69 [2021-11-25 18:48:12,050 INFO L226 Difference]: Without dead ends: 42 [2021-11-25 18:48:12,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=1241, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:48:12,052 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 60 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:12,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 62 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:12,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-25 18:48:12,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2021-11-25 18:48:12,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:12,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-11-25 18:48:12,058 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2021-11-25 18:48:12,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:12,058 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-11-25 18:48:12,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:12,058 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-11-25 18:48:12,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 18:48:12,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:12,059 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2021-11-25 18:48:12,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:12,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:48:12,272 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:12,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:12,272 INFO L85 PathProgramCache]: Analyzing trace with hash -2128271935, now seen corresponding path program 14 times [2021-11-25 18:48:12,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:12,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893661843] [2021-11-25 18:48:12,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:12,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:12,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:12,595 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:12,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:12,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893661843] [2021-11-25 18:48:12,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893661843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:12,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160138771] [2021-11-25 18:48:12,595 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:12,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:12,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:12,596 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:12,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:48:12,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:48:12,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:12,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 18:48:12,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:12,811 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 15 treesize of output 11 [2021-11-25 18:48:13,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:13,164 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:13,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:13,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:13,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:13,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:13,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:13,428 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:13,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160138771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:13,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593616679] [2021-11-25 18:48:13,430 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:13,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:13,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:13,430 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:13,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:13,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:13,467 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:13,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:13,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:13,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:13,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:13,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:13,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:13,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:13,559 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:13,559 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 195 treesize of output 198 [2021-11-25 18:48:13,600 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 18 treesize of output 14 [2021-11-25 18:48:13,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:13,967 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3603#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:13,967 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:13,967 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:13,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 29 [2021-11-25 18:48:13,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971521876] [2021-11-25 18:48:13,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:13,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:48:13,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:13,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:48:13,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1032, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:48:13,969 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 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 18:48:14,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:14,578 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-11-25 18:48:14,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 18:48:14,579 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 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 35 [2021-11-25 18:48:14,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:14,579 INFO L225 Difference]: With dead ends: 43 [2021-11-25 18:48:14,580 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 18:48:14,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=166, Invalid=1814, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:48:14,581 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 17 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:14,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 191 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:48:14,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 18:48:14,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-11-25 18:48:14,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:14,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-11-25 18:48:14,593 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2021-11-25 18:48:14,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:14,593 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-11-25 18:48:14,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 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 18:48:14,593 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-11-25 18:48:14,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 18:48:14,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:14,595 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1] [2021-11-25 18:48:14,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:14,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:48:14,796 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:14,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:14,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1037198564, now seen corresponding path program 15 times [2021-11-25 18:48:14,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:14,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417633008] [2021-11-25 18:48:14,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:14,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:14,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:14,989 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:14,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:14,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417633008] [2021-11-25 18:48:14,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417633008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:14,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526683775] [2021-11-25 18:48:14,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:14,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:14,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:14,991 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:15,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:48:15,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:15,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:15,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:48:15,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:15,344 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:15,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:15,425 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:15,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526683775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:15,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065862518] [2021-11-25 18:48:15,428 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:15,428 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:15,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:15,428 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:15,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:15,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,463 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:15,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:15,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:15,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:15,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:15,540 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:15,540 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 202 treesize of output 199 [2021-11-25 18:48:15,578 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 18 treesize of output 14 [2021-11-25 18:48:15,630 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:16,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4002#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:16,172 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:16,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:16,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-25 18:48:16,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685207320] [2021-11-25 18:48:16,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:16,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 18:48:16,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:16,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 18:48:16,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1012, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:48:16,174 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:16,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:16,354 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-25 18:48:16,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 18:48:16,354 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-25 18:48:16,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:16,355 INFO L225 Difference]: With dead ends: 76 [2021-11-25 18:48:16,355 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 18:48:16,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 89 SyntacticMatches, 9 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 805 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=388, Invalid=1504, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:48:16,357 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 72 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:16,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 65 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:16,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 18:48:16,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2021-11-25 18:48:16,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:16,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-25 18:48:16,363 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2021-11-25 18:48:16,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:16,364 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-25 18:48:16,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:16,364 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-25 18:48:16,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 18:48:16,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:16,365 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2021-11-25 18:48:16,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:16,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:48:16,572 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:16,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:16,572 INFO L85 PathProgramCache]: Analyzing trace with hash 668714754, now seen corresponding path program 16 times [2021-11-25 18:48:16,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:16,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300226731] [2021-11-25 18:48:16,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:16,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:16,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:17,033 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:17,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:17,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300226731] [2021-11-25 18:48:17,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300226731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:17,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143628519] [2021-11-25 18:48:17,034 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:17,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:17,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:17,034 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:17,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:48:17,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:17,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 18:48:17,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:17,316 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 13 treesize of output 9 [2021-11-25 18:48:17,738 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:17,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:18,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:18,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:18,132 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:18,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143628519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:18,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923343053] [2021-11-25 18:48:18,133 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:18,133 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:18,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:18,134 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:18,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:18,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:18,163 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:18,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:18,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:18,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:18,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:18,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:18,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:18,241 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:18,263 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:18,264 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 195 treesize of output 198 [2021-11-25 18:48:18,316 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 18 treesize of output 14 [2021-11-25 18:48:18,370 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:18,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4467#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:18,783 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:18,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:18,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 51 [2021-11-25 18:48:18,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258358133] [2021-11-25 18:48:18,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:18,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 18:48:18,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:18,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 18:48:18,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2921, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:48:18,785 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 51 states, 51 states have (on average 2.0) internal successors, (102), 51 states have internal predecessors, (102), 0 states have call successors, (0), 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 18:48:20,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:20,088 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2021-11-25 18:48:20,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 18:48:20,088 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 51 states have internal predecessors, (102), 0 states have call successors, (0), 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 18:48:20,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:20,089 INFO L225 Difference]: With dead ends: 47 [2021-11-25 18:48:20,089 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 18:48:20,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=320, Invalid=5230, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 18:48:20,091 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 34 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 1034 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 1034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:20,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 311 Invalid, 1094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 1034 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:48:20,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 18:48:20,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-11-25 18:48:20,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:20,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-11-25 18:48:20,104 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2021-11-25 18:48:20,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:20,105 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-11-25 18:48:20,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 51 states have internal predecessors, (102), 0 states have call successors, (0), 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 18:48:20,106 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-11-25 18:48:20,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 18:48:20,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:20,107 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1] [2021-11-25 18:48:20,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:20,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:48:20,321 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:20,321 INFO L85 PathProgramCache]: Analyzing trace with hash 1627711035, now seen corresponding path program 17 times [2021-11-25 18:48:20,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:20,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136794830] [2021-11-25 18:48:20,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:20,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:20,554 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:20,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:20,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136794830] [2021-11-25 18:48:20,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136794830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:20,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724930277] [2021-11-25 18:48:20,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:20,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:20,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:20,558 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:20,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:48:20,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 18:48:20,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:20,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:48:20,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:21,082 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:21,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:21,181 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:21,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724930277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:21,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1441746314] [2021-11-25 18:48:21,183 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:21,183 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:21,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:21,183 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:21,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:21,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:21,205 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:21,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:21,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:21,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:21,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:21,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:21,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:21,261 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:21,278 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:21,279 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 195 treesize of output 198 [2021-11-25 18:48:21,360 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 18 treesize of output 14 [2021-11-25 18:48:21,411 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:21,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4921#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:21,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:21,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:21,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-25 18:48:21,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50476536] [2021-11-25 18:48:21,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:21,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:48:21,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:21,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:48:21,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1189, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:48:21,665 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:21,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:21,854 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-25 18:48:21,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:48:21,855 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-25 18:48:21,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:21,855 INFO L225 Difference]: With dead ends: 83 [2021-11-25 18:48:21,855 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 18:48:21,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=464, Invalid=1792, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:48:21,857 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 88 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:21,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 81 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:21,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 18:48:21,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2021-11-25 18:48:21,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:21,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-11-25 18:48:21,864 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2021-11-25 18:48:21,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:21,865 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-11-25 18:48:21,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:21,865 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-11-25 18:48:21,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 18:48:21,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:21,866 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-25 18:48:21,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:22,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:22,080 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:22,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:22,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1437683935, now seen corresponding path program 18 times [2021-11-25 18:48:22,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:22,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592643347] [2021-11-25 18:48:22,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:22,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:22,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:22,545 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:22,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:22,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592643347] [2021-11-25 18:48:22,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592643347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:22,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678232857] [2021-11-25 18:48:22,546 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:22,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:22,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:22,552 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:22,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:48:22,641 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:22,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:22,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 18:48:22,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:22,696 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 15 treesize of output 11 [2021-11-25 18:48:23,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:23,171 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:23,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:23,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:23,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:23,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:23,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:23,443 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:23,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678232857] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:23,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131666795] [2021-11-25 18:48:23,444 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:23,444 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:23,445 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:23,445 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:23,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:23,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:23,477 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:23,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:23,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:23,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:23,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:23,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:23,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:23,529 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:23,547 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:23,547 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 195 treesize of output 198 [2021-11-25 18:48:23,619 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 18 treesize of output 14 [2021-11-25 18:48:23,688 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:24,047 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5412#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:24,047 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:24,048 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:24,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 35 [2021-11-25 18:48:24,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605198520] [2021-11-25 18:48:24,048 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:24,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 18:48:24,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:24,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 18:48:24,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:48:24,049 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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 18:48:24,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:24,723 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2021-11-25 18:48:24,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 18:48:24,724 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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 43 [2021-11-25 18:48:24,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:24,725 INFO L225 Difference]: With dead ends: 51 [2021-11-25 18:48:24,725 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 18:48:24,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 107 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=196, Invalid=2560, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:48:24,726 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 857 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:24,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 255 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 857 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:48:24,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 18:48:24,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-11-25 18:48:24,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:24,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-25 18:48:24,735 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 43 [2021-11-25 18:48:24,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:24,735 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-25 18:48:24,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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 18:48:24,736 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-25 18:48:24,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 18:48:24,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:24,736 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-25 18:48:24,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:24,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:24,952 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:24,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:24,952 INFO L85 PathProgramCache]: Analyzing trace with hash -623438404, now seen corresponding path program 19 times [2021-11-25 18:48:24,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:24,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45765948] [2021-11-25 18:48:24,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:24,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:24,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:25,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:25,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45765948] [2021-11-25 18:48:25,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45765948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:25,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320525687] [2021-11-25 18:48:25,194 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:25,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:25,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:25,196 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:25,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:48:25,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:25,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:48:25,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:25,603 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:25,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:25,692 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:25,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320525687] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:25,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947276038] [2021-11-25 18:48:25,693 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:25,693 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:25,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:25,693 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:25,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:25,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:25,717 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:25,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:25,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:25,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:25,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:25,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:25,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:25,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:25,811 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:25,812 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 195 treesize of output 198 [2021-11-25 18:48:25,854 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 18 treesize of output 14 [2021-11-25 18:48:25,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:26,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5893#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:26,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:26,135 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:26,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-25 18:48:26,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994478248] [2021-11-25 18:48:26,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:26,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 18:48:26,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:26,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 18:48:26,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1380, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:48:26,138 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 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 18:48:26,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:26,379 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-11-25 18:48:26,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:48:26,379 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 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) Word has length 46 [2021-11-25 18:48:26,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:26,380 INFO L225 Difference]: With dead ends: 90 [2021-11-25 18:48:26,380 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 18:48:26,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=547, Invalid=2105, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 18:48:26,381 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 108 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:26,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 78 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:26,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 18:48:26,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2021-11-25 18:48:26,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:26,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-11-25 18:48:26,389 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2021-11-25 18:48:26,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:26,389 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-11-25 18:48:26,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 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 18:48:26,389 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-11-25 18:48:26,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 18:48:26,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:26,390 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-25 18:48:26,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:26,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:26,612 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:26,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:26,612 INFO L85 PathProgramCache]: Analyzing trace with hash 1722153890, now seen corresponding path program 20 times [2021-11-25 18:48:26,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:26,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92288007] [2021-11-25 18:48:26,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:26,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:26,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:27,151 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:27,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:27,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92288007] [2021-11-25 18:48:27,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92288007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:27,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552334861] [2021-11-25 18:48:27,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:27,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:27,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:27,153 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:27,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:48:27,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 18:48:27,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:27,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 18:48:27,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:27,879 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 13 treesize of output 9 [2021-11-25 18:48:28,496 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:28,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:29,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:29,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:29,657 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:29,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552334861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:29,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446947230] [2021-11-25 18:48:29,658 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:29,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:29,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:29,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:29,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:29,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:29,695 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:29,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:29,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:29,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:29,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:29,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:29,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:29,772 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:29,795 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:29,796 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 195 treesize of output 198 [2021-11-25 18:48:29,840 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 18 treesize of output 14 [2021-11-25 18:48:29,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:30,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6464#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:30,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:30,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:30,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 73 [2021-11-25 18:48:30,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052744068] [2021-11-25 18:48:30,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:30,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 18:48:30,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:30,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 18:48:30,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=5552, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 18:48:30,311 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:34,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:34,012 INFO L93 Difference]: Finished difference Result 120 states and 133 transitions. [2021-11-25 18:48:34,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-25 18:48:34,014 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-25 18:48:34,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:34,014 INFO L225 Difference]: With dead ends: 120 [2021-11-25 18:48:34,014 INFO L226 Difference]: Without dead ends: 118 [2021-11-25 18:48:34,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4353 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1491, Invalid=16331, Unknown=0, NotChecked=0, Total=17822 [2021-11-25 18:48:34,020 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 145 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 1599 mSolverCounterSat, 299 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 1898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 299 IncrementalHoareTripleChecker+Valid, 1599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:34,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 470 Invalid, 1898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [299 Valid, 1599 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:48:34,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-25 18:48:34,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 85. [2021-11-25 18:48:34,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 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 18:48:34,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-25 18:48:34,034 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 47 [2021-11-25 18:48:34,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:34,034 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-25 18:48:34,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:34,035 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-25 18:48:34,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 18:48:34,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:34,036 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-25 18:48:34,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-25 18:48:34,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 18:48:34,244 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:34,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:34,244 INFO L85 PathProgramCache]: Analyzing trace with hash -362516351, now seen corresponding path program 21 times [2021-11-25 18:48:34,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:34,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484335523] [2021-11-25 18:48:34,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:34,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:34,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:34,837 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:34,837 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:34,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484335523] [2021-11-25 18:48:34,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484335523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:34,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55077006] [2021-11-25 18:48:34,838 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:34,838 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:34,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:34,839 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:34,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 18:48:34,916 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:34,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:34,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-25 18:48:34,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:34,964 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 15 treesize of output 11 [2021-11-25 18:48:35,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:35,545 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:35,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:35,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:35,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:35,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:35,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:35,854 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:35,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55077006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:35,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1580891205] [2021-11-25 18:48:35,855 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:35,855 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:35,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:35,856 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:35,856 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:35,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,914 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:35,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:35,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,932 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:35,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:35,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:35,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,991 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:35,992 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 202 treesize of output 199 [2021-11-25 18:48:36,019 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 18 treesize of output 14 [2021-11-25 18:48:36,095 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:36,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7211#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:36,923 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:36,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:36,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 41 [2021-11-25 18:48:36,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345417369] [2021-11-25 18:48:36,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:36,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 18:48:36,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:36,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 18:48:36,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1948, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 18:48:36,924 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:37,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:37,804 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2021-11-25 18:48:37,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 18:48:37,805 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 18:48:37,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:37,805 INFO L225 Difference]: With dead ends: 129 [2021-11-25 18:48:37,805 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 18:48:37,806 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 117 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=230, Invalid=3552, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 18:48:37,806 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 28 mSDsluCounter, 534 mSDsCounter, 0 mSdLazyCounter, 1439 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 1491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:37,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 524 Invalid, 1491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1439 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:48:37,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 18:48:37,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 85. [2021-11-25 18:48:37,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 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 18:48:37,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-25 18:48:37,823 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 51 [2021-11-25 18:48:37,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:37,823 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-25 18:48:37,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:37,824 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-25 18:48:37,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 18:48:37,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:37,824 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1] [2021-11-25 18:48:37,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:38,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 18:48:38,052 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:38,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:38,052 INFO L85 PathProgramCache]: Analyzing trace with hash 2122930268, now seen corresponding path program 22 times [2021-11-25 18:48:38,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:38,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869717988] [2021-11-25 18:48:38,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:38,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:38,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:38,326 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:38,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:38,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869717988] [2021-11-25 18:48:38,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869717988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:38,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273753086] [2021-11-25 18:48:38,326 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:38,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:38,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:38,328 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:38,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 18:48:38,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:38,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:48:38,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:38,814 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:38,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:38,930 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:38,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273753086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:38,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544633851] [2021-11-25 18:48:38,931 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:38,931 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:38,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:38,932 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:38,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:38,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:38,953 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:38,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:38,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:38,970 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:38,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:38,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:38,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:39,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,036 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:39,054 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:39,055 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 195 treesize of output 198 [2021-11-25 18:48:39,086 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 18 treesize of output 14 [2021-11-25 18:48:39,138 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:39,400 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7909#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:39,401 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:39,401 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:39,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 18:48:39,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930163455] [2021-11-25 18:48:39,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:39,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:48:39,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:39,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:48:39,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1804, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:48:39,402 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 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 18:48:39,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:39,860 INFO L93 Difference]: Finished difference Result 169 states and 172 transitions. [2021-11-25 18:48:39,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 18:48:39,860 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 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) Word has length 54 [2021-11-25 18:48:39,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:39,861 INFO L225 Difference]: With dead ends: 169 [2021-11-25 18:48:39,861 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 18:48:39,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1361 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1029, Invalid=4083, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 18:48:39,863 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 164 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:39,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 138 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:39,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 18:48:39,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2021-11-25 18:48:39,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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 18:48:39,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-11-25 18:48:39,877 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2021-11-25 18:48:39,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:39,877 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-11-25 18:48:39,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 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 18:48:39,878 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-11-25 18:48:39,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 18:48:39,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:39,878 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2021-11-25 18:48:39,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:40,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:40,104 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:40,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:40,104 INFO L85 PathProgramCache]: Analyzing trace with hash -920717246, now seen corresponding path program 23 times [2021-11-25 18:48:40,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:40,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026791350] [2021-11-25 18:48:40,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:40,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:40,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:40,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:40,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026791350] [2021-11-25 18:48:40,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026791350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:40,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348839536] [2021-11-25 18:48:40,860 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:40,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:40,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:40,861 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:40,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 18:48:41,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 18:48:41,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:41,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 18:48:41,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:41,805 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 13 treesize of output 9 [2021-11-25 18:48:42,598 INFO L354 Elim1Store]: treesize reduction 11, result has 21.4 percent of original size [2021-11-25 18:48:42,598 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 42 treesize of output 23 [2021-11-25 18:48:42,642 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 210 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:42,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:44,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 18:48:44,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 32 [2021-11-25 18:48:45,034 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 198 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:45,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348839536] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:45,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [565417435] [2021-11-25 18:48:45,035 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:45,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:45,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:45,036 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:45,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:45,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,058 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:45,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:45,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,084 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:45,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:45,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:48:45,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:45,165 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:48:45,165 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 202 treesize of output 199 [2021-11-25 18:48:45,211 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 18 treesize of output 14 [2021-11-25 18:48:45,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:46,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8687#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:46,707 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:46,707 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:46,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 85 [2021-11-25 18:48:46,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038463636] [2021-11-25 18:48:46,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:46,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-25 18:48:46,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:46,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-25 18:48:46,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=735, Invalid=7275, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 18:48:46,710 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 85 states, 85 states have (on average 1.8823529411764706) internal successors, (160), 85 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:49,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:49,934 INFO L93 Difference]: Finished difference Result 108 states and 111 transitions. [2021-11-25 18:48:49,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-25 18:48:49,934 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.8823529411764706) internal successors, (160), 85 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 18:48:49,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:49,935 INFO L225 Difference]: With dead ends: 108 [2021-11-25 18:48:49,935 INFO L226 Difference]: Without dead ends: 66 [2021-11-25 18:48:49,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 102 SyntacticMatches, 14 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5563 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1966, Invalid=19790, Unknown=0, NotChecked=0, Total=21756 [2021-11-25 18:48:49,941 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 128 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 1369 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 1816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 1369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:49,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 495 Invalid, 1816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 1369 Invalid, 0 Unknown, 185 Unchecked, 0.7s Time] [2021-11-25 18:48:49,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-25 18:48:49,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-11-25 18:48:49,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:49,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-11-25 18:48:49,958 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2021-11-25 18:48:49,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:49,958 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-11-25 18:48:49,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.8823529411764706) internal successors, (160), 85 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:49,959 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-11-25 18:48:49,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 18:48:49,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:49,960 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2021-11-25 18:48:49,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:50,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 18:48:50,180 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:50,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:50,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1889298913, now seen corresponding path program 24 times [2021-11-25 18:48:50,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:50,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712218836] [2021-11-25 18:48:50,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:50,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:50,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:50,960 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:50,961 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:50,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712218836] [2021-11-25 18:48:50,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712218836] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:50,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995749451] [2021-11-25 18:48:50,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:50,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:50,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:50,964 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:50,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 18:48:51,085 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:51,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:51,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-25 18:48:51,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:51,152 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 15 treesize of output 11 [2021-11-25 18:48:51,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:51,910 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:51,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:52,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:52,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:52,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:52,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:52,281 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:52,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995749451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:52,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117787230] [2021-11-25 18:48:52,282 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:52,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:52,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:52,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:52,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:52,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:52,301 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:52,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:52,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:52,318 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:52,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:52,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:52,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:52,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:52,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:52,401 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:52,402 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 195 treesize of output 198 [2021-11-25 18:48:52,462 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 18 treesize of output 14 [2021-11-25 18:48:52,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:52,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9455#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:52,932 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:52,932 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:52,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 47 [2021-11-25 18:48:52,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381101499] [2021-11-25 18:48:52,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:52,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-25 18:48:52,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:52,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-25 18:48:52,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 18:48:52,934 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 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 18:48:54,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:54,005 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2021-11-25 18:48:54,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 18:48:54,006 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 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 59 [2021-11-25 18:48:54,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:54,007 INFO L225 Difference]: With dead ends: 67 [2021-11-25 18:48:54,007 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 18:48:54,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 151 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=256, Invalid=4436, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 18:48:54,007 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 23 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 1638 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 1697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1638 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:54,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 512 Invalid, 1697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1638 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:48:54,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 18:48:54,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-11-25 18:48:54,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:54,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-11-25 18:48:54,023 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2021-11-25 18:48:54,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:54,024 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-11-25 18:48:54,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 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 18:48:54,024 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-11-25 18:48:54,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 18:48:54,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:54,024 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1] [2021-11-25 18:48:54,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:54,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 18:48:54,225 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:54,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:54,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1437703428, now seen corresponding path program 25 times [2021-11-25 18:48:54,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:54,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445608195] [2021-11-25 18:48:54,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:54,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:54,620 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:54,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:54,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445608195] [2021-11-25 18:48:54,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445608195] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:54,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768298477] [2021-11-25 18:48:54,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:54,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:54,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:54,624 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:54,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 18:48:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:54,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 18:48:54,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:55,302 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:55,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:55,447 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:55,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768298477] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:55,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337759496] [2021-11-25 18:48:55,449 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:55,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:55,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:55,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:55,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:55,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:55,476 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:48:55,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:48:55,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:55,495 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:55,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:55,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:55,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:55,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:55,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:55,576 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:55,576 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 195 treesize of output 198 [2021-11-25 18:48:55,633 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 18 treesize of output 14 [2021-11-25 18:48:55,700 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:55,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10100#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:55,978 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:55,978 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:55,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2021-11-25 18:48:55,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452101678] [2021-11-25 18:48:55,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:55,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 18:48:55,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:55,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 18:48:55,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=2284, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:48:55,980 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:56,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:56,250 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-11-25 18:48:56,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 18:48:56,250 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-25 18:48:56,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:56,251 INFO L225 Difference]: With dead ends: 118 [2021-11-25 18:48:56,251 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 18:48:56,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1257 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=949, Invalid=3607, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 18:48:56,256 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 144 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:56,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 132 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:56,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 18:48:56,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-11-25 18:48:56,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:56,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-11-25 18:48:56,265 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2021-11-25 18:48:56,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:56,266 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-11-25 18:48:56,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:56,266 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-11-25 18:48:56,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 18:48:56,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:56,266 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2021-11-25 18:48:56,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:56,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 18:48:56,484 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:56,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:56,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1179696354, now seen corresponding path program 26 times [2021-11-25 18:48:56,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:56,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682025166] [2021-11-25 18:48:56,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:56,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:56,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:57,225 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:57,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:57,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682025166] [2021-11-25 18:48:57,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682025166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:57,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272732727] [2021-11-25 18:48:57,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:57,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:57,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:57,227 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:57,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 18:48:57,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-25 18:48:57,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:57,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 18:48:57,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:57,907 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 15 treesize of output 11 [2021-11-25 18:48:58,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:48:58,775 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:58,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:59,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:59,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:59,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:48:59,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:48:59,164 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:59,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272732727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:59,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768708759] [2021-11-25 18:48:59,166 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:48:59,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:59,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:59,167 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:59,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:59,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,192 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:48:59,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:48:59,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:48:59,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:48:59,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,262 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:59,283 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:48:59,284 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 195 treesize of output 198 [2021-11-25 18:48:59,341 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 18 treesize of output 14 [2021-11-25 18:48:59,399 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:59,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10816#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:59,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:59,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:59,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 50 [2021-11-25 18:48:59,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434768224] [2021-11-25 18:48:59,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:59,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 18:48:59,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:59,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 18:48:59,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2824, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 18:48:59,853 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 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 18:49:00,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:00,972 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2021-11-25 18:49:00,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 18:49:00,973 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-25 18:49:00,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:00,973 INFO L225 Difference]: With dead ends: 71 [2021-11-25 18:49:00,973 INFO L226 Difference]: Without dead ends: 69 [2021-11-25 18:49:00,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 162 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=271, Invalid=4985, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 18:49:00,974 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 25 mSDsluCounter, 545 mSDsCounter, 0 mSdLazyCounter, 1792 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 545 SdHoareTripleChecker+Invalid, 1856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 1792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:00,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 545 Invalid, 1856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 1792 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:49:00,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-25 18:49:00,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-11-25 18:49:00,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:00,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-11-25 18:49:00,993 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2021-11-25 18:49:00,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:00,993 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-11-25 18:49:00,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 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 18:49:00,994 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-11-25 18:49:00,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:49:00,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:00,995 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2021-11-25 18:49:01,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:01,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 18:49:01,216 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:01,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:01,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1378507685, now seen corresponding path program 27 times [2021-11-25 18:49:01,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:01,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948970022] [2021-11-25 18:49:01,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:01,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:01,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:01,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:01,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948970022] [2021-11-25 18:49:01,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948970022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:01,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917512634] [2021-11-25 18:49:01,710 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:49:01,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:01,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:01,711 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:01,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 18:49:01,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:49:01,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:01,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 18:49:01,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:02,428 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:02,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:02,548 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:02,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917512634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:02,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995592152] [2021-11-25 18:49:02,550 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:02,550 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:02,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:02,550 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:02,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:02,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:02,571 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:02,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:02,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:02,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:02,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:02,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:02,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:02,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:02,650 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:02,651 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 195 treesize of output 198 [2021-11-25 18:49:02,684 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 18 treesize of output 14 [2021-11-25 18:49:02,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:03,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11502#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:03,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:03,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:03,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2021-11-25 18:49:03,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861499986] [2021-11-25 18:49:03,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:03,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 18:49:03,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:03,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 18:49:03,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=2545, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:49:03,021 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:03,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:03,327 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-11-25 18:49:03,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 18:49:03,328 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-25 18:49:03,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:03,328 INFO L225 Difference]: With dead ends: 125 [2021-11-25 18:49:03,328 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 18:49:03,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1067, Invalid=4045, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 18:49:03,329 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 168 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:03,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 130 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:49:03,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 18:49:03,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-11-25 18:49:03,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:03,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-11-25 18:49:03,342 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2021-11-25 18:49:03,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:03,342 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-11-25 18:49:03,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:03,342 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-11-25 18:49:03,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 18:49:03,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:03,342 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-25 18:49:03,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-25 18:49:03,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 18:49:03,543 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:03,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:03,543 INFO L85 PathProgramCache]: Analyzing trace with hash 1806474049, now seen corresponding path program 28 times [2021-11-25 18:49:03,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:03,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199447204] [2021-11-25 18:49:03,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:03,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:03,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:04,456 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:04,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:04,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199447204] [2021-11-25 18:49:04,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199447204] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:04,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668540336] [2021-11-25 18:49:04,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:49:04,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:04,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:04,457 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:04,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 18:49:04,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:04,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 18:49:04,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:04,642 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 15 treesize of output 11 [2021-11-25 18:49:05,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:49:05,622 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:05,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:06,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:06,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:06,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:06,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:06,092 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:06,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668540336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:06,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278763069] [2021-11-25 18:49:06,093 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:06,093 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:06,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:06,094 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:06,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:06,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:06,118 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:06,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:06,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:06,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:06,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:06,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:06,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:06,201 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:06,225 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:06,226 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 195 treesize of output 198 [2021-11-25 18:49:06,276 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 18 treesize of output 14 [2021-11-25 18:49:06,340 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:06,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12263#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:06,730 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:06,730 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:06,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 53 [2021-11-25 18:49:06,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222909935] [2021-11-25 18:49:06,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:06,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 18:49:06,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:06,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 18:49:06,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3152, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 18:49:06,732 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:08,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:08,063 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2021-11-25 18:49:08,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 18:49:08,064 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-25 18:49:08,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:08,064 INFO L225 Difference]: With dead ends: 75 [2021-11-25 18:49:08,065 INFO L226 Difference]: Without dead ends: 73 [2021-11-25 18:49:08,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 173 SyntacticMatches, 6 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 757 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=286, Invalid=5566, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 18:49:08,066 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 25 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 2231 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 694 SdHoareTripleChecker+Invalid, 2298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:08,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 694 Invalid, 2298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2231 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:49:08,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-25 18:49:08,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-11-25 18:49:08,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:08,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-11-25 18:49:08,077 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2021-11-25 18:49:08,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:08,077 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-11-25 18:49:08,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:08,077 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-11-25 18:49:08,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:49:08,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:08,078 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1] [2021-11-25 18:49:08,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-25 18:49:08,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:08,278 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:08,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:08,279 INFO L85 PathProgramCache]: Analyzing trace with hash 732968348, now seen corresponding path program 29 times [2021-11-25 18:49:08,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:08,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942291566] [2021-11-25 18:49:08,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:08,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:08,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:08,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:08,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942291566] [2021-11-25 18:49:08,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942291566] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:08,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550445583] [2021-11-25 18:49:08,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:49:08,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:08,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:08,682 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:08,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 18:49:09,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-25 18:49:09,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:09,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 18:49:09,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:09,984 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:09,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:10,113 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:10,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550445583] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:10,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961613034] [2021-11-25 18:49:10,114 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:10,114 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:10,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:10,115 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:10,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:10,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:10,154 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:49:10,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:49:10,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:10,174 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:10,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:10,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:10,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:10,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:10,221 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:10,239 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:10,239 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 195 treesize of output 198 [2021-11-25 18:49:10,290 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 18 treesize of output 14 [2021-11-25 18:49:10,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:10,724 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12990#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:10,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:10,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:10,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2021-11-25 18:49:10,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316335720] [2021-11-25 18:49:10,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:10,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-25 18:49:10,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:10,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-25 18:49:10,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=2820, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 18:49:10,726 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:11,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:11,115 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-11-25 18:49:11,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 18:49:11,115 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 18:49:11,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:11,116 INFO L225 Difference]: With dead ends: 132 [2021-11-25 18:49:11,116 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 18:49:11,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1561 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1192, Invalid=4508, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 18:49:11,117 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 168 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:11,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 120 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:11,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 18:49:11,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2021-11-25 18:49:11,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:11,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-25 18:49:11,128 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 70 [2021-11-25 18:49:11,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:11,128 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-25 18:49:11,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:11,128 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-25 18:49:11,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:49:11,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:11,129 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2021-11-25 18:49:11,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-25 18:49:11,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:11,329 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:11,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:11,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1513797246, now seen corresponding path program 30 times [2021-11-25 18:49:11,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:11,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119488019] [2021-11-25 18:49:11,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:11,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:11,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:12,205 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:12,205 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:12,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119488019] [2021-11-25 18:49:12,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119488019] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:12,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840287035] [2021-11-25 18:49:12,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:49:12,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:12,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:12,215 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:12,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 18:49:12,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:49:12,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:12,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-25 18:49:12,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:12,408 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 15 treesize of output 11 [2021-11-25 18:49:13,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:49:13,533 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:13,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:13,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:13,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:13,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:13,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:13,936 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:13,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840287035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:13,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404721780] [2021-11-25 18:49:13,937 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:13,937 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:13,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:13,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:13,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:13,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:13,972 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:49:13,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:49:13,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:13,988 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:13,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:14,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:14,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:14,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:14,039 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:14,057 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:14,057 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 195 treesize of output 198 [2021-11-25 18:49:14,112 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 18 treesize of output 14 [2021-11-25 18:49:14,158 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:14,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13796#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:14,561 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:14,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:14,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 56 [2021-11-25 18:49:14,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216639316] [2021-11-25 18:49:14,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:14,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 18:49:14,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:14,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 18:49:14,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=3498, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:49:14,563 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 56 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:15,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:15,998 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2021-11-25 18:49:15,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-25 18:49:15,998 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-25 18:49:15,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:15,999 INFO L225 Difference]: With dead ends: 79 [2021-11-25 18:49:15,999 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 18:49:16,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 184 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=301, Invalid=6179, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 18:49:16,000 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 26 mSDsluCounter, 775 mSDsCounter, 0 mSdLazyCounter, 2400 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 773 SdHoareTripleChecker+Invalid, 2471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:16,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 773 Invalid, 2471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2400 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:49:16,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 18:49:16,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-11-25 18:49:16,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:16,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-11-25 18:49:16,017 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2021-11-25 18:49:16,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:16,017 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-11-25 18:49:16,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:16,018 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-11-25 18:49:16,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 18:49:16,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:16,018 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1] [2021-11-25 18:49:16,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-25 18:49:16,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:16,224 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:16,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:16,224 INFO L85 PathProgramCache]: Analyzing trace with hash -372354117, now seen corresponding path program 31 times [2021-11-25 18:49:16,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:16,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295448500] [2021-11-25 18:49:16,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:16,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:16,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:16,747 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:16,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:16,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295448500] [2021-11-25 18:49:16,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295448500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:16,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463436259] [2021-11-25 18:49:16,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:49:16,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:16,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:16,752 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:16,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 18:49:16,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:16,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 18:49:16,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:17,721 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:17,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:17,856 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:17,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463436259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:17,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1371154113] [2021-11-25 18:49:17,857 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:17,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:17,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:17,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:17,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:17,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,881 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:17,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:17,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:17,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:49:17,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:17,983 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:49:17,983 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 202 treesize of output 199 [2021-11-25 18:49:18,015 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 18 treesize of output 14 [2021-11-25 18:49:18,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:18,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14564#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:18,361 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:18,361 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:18,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2021-11-25 18:49:18,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071537156] [2021-11-25 18:49:18,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:18,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 18:49:18,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:18,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 18:49:18,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=797, Invalid=3109, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 18:49:18,363 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:18,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:18,712 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-11-25 18:49:18,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 18:49:18,712 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-25 18:49:18,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:18,713 INFO L225 Difference]: With dead ends: 139 [2021-11-25 18:49:18,713 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 18:49:18,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1725 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1324, Invalid=4996, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 18:49:18,714 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 144 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:18,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 174 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:18,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 18:49:18,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2021-11-25 18:49:18,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:18,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-11-25 18:49:18,726 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2021-11-25 18:49:18,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:18,726 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-11-25 18:49:18,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:18,726 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-11-25 18:49:18,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:49:18,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:18,726 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2021-11-25 18:49:18,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-25 18:49:18,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 18:49:18,927 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:18,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:18,928 INFO L85 PathProgramCache]: Analyzing trace with hash 1774912673, now seen corresponding path program 32 times [2021-11-25 18:49:18,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:18,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787489761] [2021-11-25 18:49:18,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:18,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:18,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:19,947 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:19,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:19,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787489761] [2021-11-25 18:49:19,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787489761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:19,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344965635] [2021-11-25 18:49:19,948 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:49:19,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:19,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:19,949 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:19,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 18:49:20,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 18:49:20,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:20,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 18:49:20,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:20,796 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 15 treesize of output 11 [2021-11-25 18:49:21,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:49:21,890 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:21,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:22,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:22,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:22,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:22,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:22,365 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:22,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344965635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:22,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1370104275] [2021-11-25 18:49:22,366 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:22,367 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:22,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:22,367 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:22,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:22,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:22,390 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:22,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:22,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:22,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:22,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:22,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:22,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:22,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:22,477 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:22,477 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 195 treesize of output 198 [2021-11-25 18:49:22,516 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 18 treesize of output 14 [2021-11-25 18:49:22,573 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:22,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15415#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:22,992 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:22,992 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:22,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 59 [2021-11-25 18:49:22,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931291081] [2021-11-25 18:49:22,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:22,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 18:49:22,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:22,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 18:49:22,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3862, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 18:49:22,993 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 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 18:49:24,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:24,595 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2021-11-25 18:49:24,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 18:49:24,595 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 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 18:49:24,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:24,596 INFO L225 Difference]: With dead ends: 83 [2021-11-25 18:49:24,596 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 18:49:24,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 921 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=316, Invalid=6824, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 18:49:24,597 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 851 mSDsCounter, 0 mSdLazyCounter, 2760 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 2837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:24,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 851 Invalid, 2837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2760 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:49:24,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 18:49:24,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-11-25 18:49:24,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:24,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-11-25 18:49:24,609 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2021-11-25 18:49:24,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:24,609 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-11-25 18:49:24,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 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 18:49:24,609 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-11-25 18:49:24,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 18:49:24,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:24,610 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1] [2021-11-25 18:49:24,630 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-25 18:49:24,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-25 18:49:24,810 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:24,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:24,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1085853756, now seen corresponding path program 33 times [2021-11-25 18:49:24,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:24,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229175600] [2021-11-25 18:49:24,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:24,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:24,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:25,394 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:25,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:25,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229175600] [2021-11-25 18:49:25,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229175600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:25,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806364060] [2021-11-25 18:49:25,395 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:49:25,395 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:25,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:25,400 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:25,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 18:49:25,547 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:49:25,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:25,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 18:49:25,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:26,297 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:26,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:26,435 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:26,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806364060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:26,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1552659811] [2021-11-25 18:49:26,437 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:26,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:26,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:26,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:26,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:26,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:26,458 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:49:26,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:49:26,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:26,475 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:26,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:26,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:26,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:26,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:26,516 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:26,535 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:26,535 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 195 treesize of output 198 [2021-11-25 18:49:26,594 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 18 treesize of output 14 [2021-11-25 18:49:26,651 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:26,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16224#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:26,965 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:26,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:26,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-25 18:49:26,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773274846] [2021-11-25 18:49:26,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:26,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 18:49:26,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:26,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 18:49:26,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=878, Invalid=3412, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 18:49:26,966 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:27,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:27,355 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-11-25 18:49:27,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 18:49:27,356 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-25 18:49:27,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:27,356 INFO L225 Difference]: With dead ends: 146 [2021-11-25 18:49:27,356 INFO L226 Difference]: Without dead ends: 86 [2021-11-25 18:49:27,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1897 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1463, Invalid=5509, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 18:49:27,357 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 216 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:27,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 141 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:27,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-25 18:49:27,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2021-11-25 18:49:27,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:27,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-11-25 18:49:27,371 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 78 [2021-11-25 18:49:27,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:27,371 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-11-25 18:49:27,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:27,371 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-11-25 18:49:27,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:49:27,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:27,371 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2021-11-25 18:49:27,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:27,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:27,572 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:27,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:27,572 INFO L85 PathProgramCache]: Analyzing trace with hash 528916002, now seen corresponding path program 34 times [2021-11-25 18:49:27,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:27,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795940178] [2021-11-25 18:49:27,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:27,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:27,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:28,798 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:28,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:28,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795940178] [2021-11-25 18:49:28,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795940178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:28,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298074498] [2021-11-25 18:49:28,799 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:49:28,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:28,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:28,799 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:28,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 18:49:28,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:28,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 18:49:28,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:29,011 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 15 treesize of output 11 [2021-11-25 18:49:30,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:49:30,195 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:30,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:30,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:30,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:30,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:30,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:30,670 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:30,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [298074498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:30,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56067251] [2021-11-25 18:49:30,671 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:30,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:30,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:30,672 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:30,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:30,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,693 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:30,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:30,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:30,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:49:30,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,752 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:49:30,752 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 202 treesize of output 199 [2021-11-25 18:49:30,780 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 18 treesize of output 14 [2021-11-25 18:49:30,857 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:32,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17120#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:32,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:32,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:32,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 62 [2021-11-25 18:49:32,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811781583] [2021-11-25 18:49:32,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:32,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 18:49:32,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:32,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 18:49:32,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=4244, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 18:49:32,344 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 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 18:49:34,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:34,032 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2021-11-25 18:49:34,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-25 18:49:34,032 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-25 18:49:34,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:34,033 INFO L225 Difference]: With dead ends: 87 [2021-11-25 18:49:34,033 INFO L226 Difference]: Without dead ends: 85 [2021-11-25 18:49:34,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 187 SyntacticMatches, 25 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1462 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=331, Invalid=7501, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 18:49:34,035 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 29 mSDsluCounter, 921 mSDsCounter, 0 mSdLazyCounter, 2926 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 3006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 2926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:34,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 919 Invalid, 3006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 2926 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 18:49:34,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-25 18:49:34,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-11-25 18:49:34,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:34,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-11-25 18:49:34,049 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2021-11-25 18:49:34,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:34,049 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-11-25 18:49:34,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 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 18:49:34,050 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-11-25 18:49:34,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 18:49:34,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:34,050 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1] [2021-11-25 18:49:34,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:34,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 18:49:34,268 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:34,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:34,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1293599973, now seen corresponding path program 35 times [2021-11-25 18:49:34,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:34,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347551735] [2021-11-25 18:49:34,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:34,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:34,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:34,902 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:34,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:34,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347551735] [2021-11-25 18:49:34,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347551735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:34,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398030141] [2021-11-25 18:49:34,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:49:34,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:34,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:34,908 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:34,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 18:49:37,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-25 18:49:37,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:37,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:49:37,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:38,124 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:38,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:38,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398030141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:38,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [507314120] [2021-11-25 18:49:38,332 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:38,332 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:38,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:38,332 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:38,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:38,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:38,360 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:49:38,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:49:38,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:38,384 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:38,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:38,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:38,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:38,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:38,457 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:38,480 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:38,481 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 195 treesize of output 198 [2021-11-25 18:49:38,520 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 18 treesize of output 14 [2021-11-25 18:49:38,579 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:38,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17970#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:38,987 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:38,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:38,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2021-11-25 18:49:38,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853943229] [2021-11-25 18:49:38,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:38,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 18:49:38,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:38,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 18:49:38,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3729, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 18:49:38,989 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:39,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:39,398 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-11-25 18:49:39,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 18:49:39,399 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-25 18:49:39,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:39,399 INFO L225 Difference]: With dead ends: 153 [2021-11-25 18:49:39,399 INFO L226 Difference]: Without dead ends: 90 [2021-11-25 18:49:39,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1609, Invalid=6047, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 18:49:39,400 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 220 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:39,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 189 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:39,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-25 18:49:39,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-11-25 18:49:39,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:39,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2021-11-25 18:49:39,418 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 82 [2021-11-25 18:49:39,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:39,419 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2021-11-25 18:49:39,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:39,419 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2021-11-25 18:49:39,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 18:49:39,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:39,420 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2021-11-25 18:49:39,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:39,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 18:49:39,628 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:39,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:39,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1196579327, now seen corresponding path program 36 times [2021-11-25 18:49:39,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:39,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347749867] [2021-11-25 18:49:39,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:39,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:40,870 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:40,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:40,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347749867] [2021-11-25 18:49:40,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347749867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:40,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136076252] [2021-11-25 18:49:40,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:49:40,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:40,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:40,872 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:40,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 18:49:41,012 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:49:41,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:41,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-25 18:49:41,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:41,099 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 15 treesize of output 11 [2021-11-25 18:49:42,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:49:42,398 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:42,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:42,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:42,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:42,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:49:42,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:49:42,879 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:42,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136076252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:42,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294269381] [2021-11-25 18:49:42,881 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:42,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:42,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:42,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:42,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:42,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:42,917 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:42,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:42,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:42,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:49:42,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:42,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:49:42,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:42,967 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:42,985 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:49:42,985 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 195 treesize of output 198 [2021-11-25 18:49:43,030 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 18 treesize of output 14 [2021-11-25 18:49:43,076 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:43,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18911#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:43,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:43,526 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:43,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 65 [2021-11-25 18:49:43,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770806665] [2021-11-25 18:49:43,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:43,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 18:49:43,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:43,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 18:49:43,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4644, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 18:49:43,528 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:45,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:45,382 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2021-11-25 18:49:45,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-25 18:49:45,383 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-25 18:49:45,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:45,384 INFO L225 Difference]: With dead ends: 91 [2021-11-25 18:49:45,384 INFO L226 Difference]: Without dead ends: 89 [2021-11-25 18:49:45,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 217 SyntacticMatches, 6 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=346, Invalid=8210, Unknown=0, NotChecked=0, Total=8556 [2021-11-25 18:49:45,385 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 29 mSDsluCounter, 1070 mSDsCounter, 0 mSdLazyCounter, 3263 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 1068 SdHoareTripleChecker+Invalid, 3346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:45,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 1068 Invalid, 3346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3263 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 18:49:45,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-25 18:49:45,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-11-25 18:49:45,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:45,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-11-25 18:49:45,401 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2021-11-25 18:49:45,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:45,401 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-11-25 18:49:45,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:45,402 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-11-25 18:49:45,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 18:49:45,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:45,402 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1] [2021-11-25 18:49:45,422 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-25 18:49:45,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 18:49:45,604 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:45,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:45,605 INFO L85 PathProgramCache]: Analyzing trace with hash 938619612, now seen corresponding path program 37 times [2021-11-25 18:49:45,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:45,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400439441] [2021-11-25 18:49:45,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:45,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:45,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:46,326 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:46,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:46,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400439441] [2021-11-25 18:49:46,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400439441] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:46,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898721512] [2021-11-25 18:49:46,327 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:49:46,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:46,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:46,328 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:46,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 18:49:46,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:46,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 18:49:46,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:47,314 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:47,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:47,469 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:47,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898721512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:47,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55557907] [2021-11-25 18:49:47,470 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:49:47,470 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:47,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:47,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:47,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:47,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,500 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:49:47,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:49:47,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,517 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:49:47,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:49:47,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:49:47,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:47,574 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:49:47,574 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 202 treesize of output 199 [2021-11-25 18:49:47,601 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 18 treesize of output 14 [2021-11-25 18:49:47,700 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:48,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19802#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:49:48,737 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:48,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:48,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2021-11-25 18:49:48,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770949316] [2021-11-25 18:49:48,738 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:48,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 18:49:48,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:48,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 18:49:48,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=4060, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 18:49:48,739 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:49,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:49,160 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2021-11-25 18:49:49,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 18:49:49,165 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-25 18:49:49,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:49,166 INFO L225 Difference]: With dead ends: 160 [2021-11-25 18:49:49,166 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 18:49:49,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 209 SyntacticMatches, 21 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3649 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1762, Invalid=6610, Unknown=0, NotChecked=0, Total=8372 [2021-11-25 18:49:49,167 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 228 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:49,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 153 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:49,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 18:49:49,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2021-11-25 18:49:49,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:49,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-11-25 18:49:49,183 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2021-11-25 18:49:49,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:49,184 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-11-25 18:49:49,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:49:49,184 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-11-25 18:49:49,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 18:49:49,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:49,184 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2021-11-25 18:49:49,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-25 18:49:49,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 18:49:49,385 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:49,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:49,385 INFO L85 PathProgramCache]: Analyzing trace with hash -65094974, now seen corresponding path program 38 times [2021-11-25 18:49:49,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:49,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431941699] [2021-11-25 18:49:49,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:49,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:49,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:50,574 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:50,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:50,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431941699] [2021-11-25 18:49:50,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431941699] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:50,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315459552] [2021-11-25 18:49:50,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:49:50,574 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:50,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:50,575 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:50,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 18:49:53,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-25 18:49:53,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:53,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 18:49:53,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:53,999 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 18 treesize of output 14 [2021-11-25 18:49:54,066 INFO L354 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2021-11-25 18:49:54,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-25 18:49:54,152 INFO L354 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2021-11-25 18:49:54,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 18:49:56,448 INFO L354 Elim1Store]: treesize reduction 76, result has 3.8 percent of original size [2021-11-25 18:49:56,449 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 60 treesize of output 29 [2021-11-25 18:49:56,541 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 590 proven. 251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:56,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:50:07,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 39 [2021-11-25 18:50:07,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 564 treesize of output 550 [2021-11-25 18:50:10,228 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 408 proven. 432 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:10,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315459552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:50:10,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495948956] [2021-11-25 18:50:10,229 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:50:10,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:50:10,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:50:10,229 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:50:10,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:10,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,249 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:50:10,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:50:10,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,266 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:50:10,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:50:10,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:50:10,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:10,355 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:50:10,355 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 202 treesize of output 199 [2021-11-25 18:50:10,387 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 18 treesize of output 14 [2021-11-25 18:50:10,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:50:13,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20853#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:50:13,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:50:13,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:50:13,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 133 [2021-11-25 18:50:13,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053959393] [2021-11-25 18:50:13,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:50:13,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-25 18:50:13,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:13,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-25 18:50:13,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1488, Invalid=17410, Unknown=8, NotChecked=0, Total=18906 [2021-11-25 18:50:13,103 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 133 states, 133 states have (on average 1.9248120300751879) internal successors, (256), 133 states have internal predecessors, (256), 0 states have call successors, (0), 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 18:50:27,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:27,059 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2021-11-25 18:50:27,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-25 18:50:27,060 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.9248120300751879) internal successors, (256), 133 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-25 18:50:27,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:27,061 INFO L225 Difference]: With dead ends: 220 [2021-11-25 18:50:27,061 INFO L226 Difference]: Without dead ends: 91 [2021-11-25 18:50:27,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 176 SyntacticMatches, 25 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12222 ImplicationChecksByTransitivity, 31.3s TimeCoverageRelationStatistics Valid=3909, Invalid=37901, Unknown=10, NotChecked=0, Total=41820 [2021-11-25 18:50:27,066 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 1130 mSDsCounter, 0 mSdLazyCounter, 3398 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 1150 SdHoareTripleChecker+Invalid, 4087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 3398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 609 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:27,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 1150 Invalid, 4087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 3398 Invalid, 0 Unknown, 609 Unchecked, 1.5s Time] [2021-11-25 18:50:27,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-25 18:50:27,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-25 18:50:27,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:50:27,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-11-25 18:50:27,085 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2021-11-25 18:50:27,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:27,085 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-11-25 18:50:27,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.9248120300751879) internal successors, (256), 133 states have internal predecessors, (256), 0 states have call successors, (0), 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 18:50:27,085 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-11-25 18:50:27,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 18:50:27,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:27,086 INFO L514 BasicCegarLoop]: trace histogram [24, 21, 20, 20, 1, 1, 1, 1, 1] [2021-11-25 18:50:27,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:27,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 18:50:27,286 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:27,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:27,287 INFO L85 PathProgramCache]: Analyzing trace with hash 583531612, now seen corresponding path program 39 times [2021-11-25 18:50:27,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:27,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255444351] [2021-11-25 18:50:27,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:27,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:27,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:28,663 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 1 proven. 909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:28,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:28,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255444351] [2021-11-25 18:50:28,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255444351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:28,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56965907] [2021-11-25 18:50:28,664 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:50:28,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:28,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:28,665 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:28,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 18:50:28,837 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:50:28,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:50:28,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-25 18:50:28,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:28,925 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 15 treesize of output 11 [2021-11-25 18:50:28,970 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:28,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:28,987 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:28,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:29,048 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:29,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:30,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:50:30,524 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 3 proven. 907 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:30,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:50:31,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 18:50:31,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 60 [2021-11-25 18:50:31,247 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 0 proven. 909 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:50:31,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56965907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:50:31,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [349954044] [2021-11-25 18:50:31,248 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:50:31,248 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:50:31,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:50:31,248 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:50:31,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:31,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,273 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:50:31,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:50:31,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,295 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:50:31,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:50:31,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:50:31,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:31,379 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:50:31,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 199 [2021-11-25 18:50:31,408 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 18 treesize of output 14 [2021-11-25 18:50:31,473 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:50:33,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22076#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:50:33,712 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:50:33,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:50:33,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 48] total 72 [2021-11-25 18:50:33,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646063563] [2021-11-25 18:50:33,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:50:33,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-25 18:50:33,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:33,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-25 18:50:33,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=5640, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 18:50:33,714 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 72 states, 72 states have (on average 2.2083333333333335) internal successors, (159), 72 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:50:36,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:36,538 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-11-25 18:50:36,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-25 18:50:36,538 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 2.2083333333333335) internal successors, (159), 72 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-25 18:50:36,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:36,539 INFO L225 Difference]: With dead ends: 98 [2021-11-25 18:50:36,539 INFO L226 Difference]: Without dead ends: 96 [2021-11-25 18:50:36,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 213 SyntacticMatches, 29 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3139 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=675, Invalid=13845, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 18:50:36,541 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 32 mSDsluCounter, 1118 mSDsCounter, 0 mSdLazyCounter, 3700 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 1118 SdHoareTripleChecker+Invalid, 3790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 3700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:36,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 1118 Invalid, 3790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 3700 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 18:50:36,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-25 18:50:36,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2021-11-25 18:50:36,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 0 states have call successors, (0), 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 18:50:36,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-11-25 18:50:36,564 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-11-25 18:50:36,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:36,565 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-11-25 18:50:36,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 2.2083333333333335) internal successors, (159), 72 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:50:36,565 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-11-25 18:50:36,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:50:36,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:36,566 INFO L514 BasicCegarLoop]: trace histogram [24, 22, 21, 21, 1, 1, 1, 1, 1] [2021-11-25 18:50:36,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:36,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:36,780 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:36,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:36,780 INFO L85 PathProgramCache]: Analyzing trace with hash -2032567647, now seen corresponding path program 40 times [2021-11-25 18:50:36,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:36,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323519075] [2021-11-25 18:50:36,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:36,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:36,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:38,183 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:38,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:38,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323519075] [2021-11-25 18:50:38,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323519075] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:38,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149538689] [2021-11-25 18:50:38,184 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:50:38,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:38,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:38,185 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:38,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 18:50:38,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:38,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-25 18:50:38,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:38,493 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 15 treesize of output 11 [2021-11-25 18:50:38,539 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:38,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:38,615 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:38,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:40,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:50:40,163 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 1 proven. 971 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:40,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:50:40,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 18:50:40,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 60 [2021-11-25 18:50:40,950 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:40,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149538689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:50:40,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710623570] [2021-11-25 18:50:40,951 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:50:40,951 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:50:40,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:50:40,951 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:50:40,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:40,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:40,973 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:50:40,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:50:40,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:40,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:50:40,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:40,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:50:41,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:41,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:41,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:41,049 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:50:41,049 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 202 treesize of output 199 [2021-11-25 18:50:41,079 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 18 treesize of output 14 [2021-11-25 18:50:41,125 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:50:41,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23082#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:50:41,649 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:50:41,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:50:41,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 74 [2021-11-25 18:50:41,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438451585] [2021-11-25 18:50:41,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:50:41,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-25 18:50:41,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:41,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-25 18:50:41,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=5948, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 18:50:41,650 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 74 states, 74 states have (on average 2.2027027027027026) internal successors, (163), 74 states have internal predecessors, (163), 0 states have call successors, (0), 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 18:50:44,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:44,775 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2021-11-25 18:50:44,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-25 18:50:44,776 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.2027027027027026) internal successors, (163), 74 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-25 18:50:44,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:44,777 INFO L225 Difference]: With dead ends: 101 [2021-11-25 18:50:44,777 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 18:50:44,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 243 SyntacticMatches, 7 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2662 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=652, Invalid=14848, Unknown=0, NotChecked=0, Total=15500 [2021-11-25 18:50:44,778 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 31 mSDsluCounter, 1308 mSDsCounter, 0 mSdLazyCounter, 4372 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 1306 SdHoareTripleChecker+Invalid, 4464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 4372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:44,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 1306 Invalid, 4464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 4372 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-25 18:50:44,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 18:50:44,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2021-11-25 18:50:44,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 96 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 18:50:44,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-11-25 18:50:44,804 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2021-11-25 18:50:44,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:44,804 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-11-25 18:50:44,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.2027027027027026) internal successors, (163), 74 states have internal predecessors, (163), 0 states have call successors, (0), 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 18:50:44,805 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-11-25 18:50:44,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 18:50:44,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:44,805 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-25 18:50:44,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:45,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:45,020 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:45,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:45,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1769039300, now seen corresponding path program 41 times [2021-11-25 18:50:45,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:45,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085388026] [2021-11-25 18:50:45,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:45,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:45,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:46,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1037 backedges. 0 proven. 1037 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:46,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:46,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085388026] [2021-11-25 18:50:46,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085388026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:46,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549226702] [2021-11-25 18:50:46,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:50:46,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:46,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:46,828 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:46,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 18:50:50,015 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-25 18:50:50,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:50:50,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-25 18:50:50,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:50,140 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 15 treesize of output 11 [2021-11-25 18:50:50,246 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-25 18:50:50,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 18:50:51,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:50:52,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1037 backedges. 0 proven. 1037 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:52,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:50:52,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2021-11-25 18:50:52,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 63 [2021-11-25 18:50:52,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1037 backedges. 0 proven. 1037 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:52,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549226702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:50:52,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1507807641] [2021-11-25 18:50:52,653 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:50:52,653 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:50:52,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:50:52,654 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:50:52,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:52,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:52,691 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:50:52,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:50:52,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:52,709 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:50:52,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:50:52,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:52,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:50:52,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:50:52,752 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:50:52,770 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:50:52,770 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 195 treesize of output 198 [2021-11-25 18:50:52,843 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 18 treesize of output 14 [2021-11-25 18:50:52,895 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:50:53,434 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24120#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:50:53,434 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:50:53,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:50:53,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2021-11-25 18:50:53,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354285518] [2021-11-25 18:50:53,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:50:53,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-25 18:50:53,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:53,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-25 18:50:53,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=6263, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 18:50:53,436 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 76 states, 76 states have (on average 2.223684210526316) internal successors, (169), 76 states have internal predecessors, (169), 0 states have call successors, (0), 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 18:50:55,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:55,979 INFO L93 Difference]: Finished difference Result 175 states and 177 transitions. [2021-11-25 18:50:55,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-25 18:50:55,980 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.223684210526316) internal successors, (169), 76 states have internal predecessors, (169), 0 states have call successors, (0), 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 96 [2021-11-25 18:50:55,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:55,981 INFO L225 Difference]: With dead ends: 175 [2021-11-25 18:50:55,981 INFO L226 Difference]: Without dead ends: 173 [2021-11-25 18:50:55,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 251 SyntacticMatches, 7 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1519 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=398, Invalid=10944, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 18:50:55,982 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 32 mSDsluCounter, 1599 mSDsCounter, 0 mSdLazyCounter, 4444 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 1598 SdHoareTripleChecker+Invalid, 4571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 4444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:55,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 1598 Invalid, 4571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 4444 Invalid, 0 Unknown, 74 Unchecked, 1.7s Time] [2021-11-25 18:50:55,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-25 18:50:56,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 101. [2021-11-25 18:50:56,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.03) internal successors, (103), 100 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 18:50:56,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-11-25 18:50:56,002 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 96 [2021-11-25 18:50:56,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:56,003 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-11-25 18:50:56,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.223684210526316) internal successors, (169), 76 states have internal predecessors, (169), 0 states have call successors, (0), 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 18:50:56,003 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-11-25 18:50:56,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-25 18:50:56,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:56,004 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-25 18:50:56,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:56,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:56,224 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:56,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:56,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1937177250, now seen corresponding path program 42 times [2021-11-25 18:50:56,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:56,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310560856] [2021-11-25 18:50:56,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:56,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:56,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:57,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:57,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:57,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310560856] [2021-11-25 18:50:57,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310560856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:57,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137476637] [2021-11-25 18:50:57,879 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:50:57,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:57,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:57,879 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:57,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 18:50:58,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:50:58,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:50:58,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 18:50:58,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:58,143 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 15 treesize of output 11 [2021-11-25 18:50:58,190 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:58,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:58,253 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:50:58,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:50:59,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:50:59,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 1 proven. 1061 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:50:59,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:00,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 18:51:00,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 60 [2021-11-25 18:51:00,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:00,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137476637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:00,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1275899865] [2021-11-25 18:51:00,588 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:00,589 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:00,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:00,589 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:00,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:00,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:00,612 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:51:00,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:51:00,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:00,629 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:00,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:00,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:00,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:00,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:00,694 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:00,712 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:00,712 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 195 treesize of output 198 [2021-11-25 18:51:00,756 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 18 treesize of output 14 [2021-11-25 18:51:00,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:01,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25230#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:01,320 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:01,321 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:01,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 77 [2021-11-25 18:51:01,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284737538] [2021-11-25 18:51:01,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:01,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 18:51:01,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:01,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 18:51:01,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=6420, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 18:51:01,323 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 77 states, 77 states have (on average 2.207792207792208) internal successors, (170), 77 states have internal predecessors, (170), 0 states have call successors, (0), 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 18:51:04,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:04,790 INFO L93 Difference]: Finished difference Result 173 states and 175 transitions. [2021-11-25 18:51:04,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-25 18:51:04,790 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.207792207792208) internal successors, (170), 77 states have internal predecessors, (170), 0 states have call successors, (0), 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 97 [2021-11-25 18:51:04,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:04,791 INFO L225 Difference]: With dead ends: 173 [2021-11-25 18:51:04,791 INFO L226 Difference]: Without dead ends: 171 [2021-11-25 18:51:04,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 254 SyntacticMatches, 7 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2884 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=679, Invalid=16091, Unknown=0, NotChecked=0, Total=16770 [2021-11-25 18:51:04,792 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 90 mSDsluCounter, 1459 mSDsCounter, 0 mSdLazyCounter, 4781 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1457 SdHoareTripleChecker+Invalid, 4971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 4781 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:04,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 1457 Invalid, 4971 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 4781 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 18:51:04,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-25 18:51:04,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 100. [2021-11-25 18:51:04,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:04,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-11-25 18:51:04,816 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 97 [2021-11-25 18:51:04,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:04,816 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-11-25 18:51:04,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.207792207792208) internal successors, (170), 77 states have internal predecessors, (170), 0 states have call successors, (0), 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 18:51:04,816 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-11-25 18:51:04,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 18:51:04,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:04,817 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2021-11-25 18:51:04,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:05,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-25 18:51:05,017 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:05,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:05,018 INFO L85 PathProgramCache]: Analyzing trace with hash 2098696385, now seen corresponding path program 43 times [2021-11-25 18:51:05,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:05,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619516813] [2021-11-25 18:51:05,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:05,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:05,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:06,728 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:06,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619516813] [2021-11-25 18:51:06,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619516813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:06,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715673740] [2021-11-25 18:51:06,729 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:51:06,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:06,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:06,729 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:06,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 18:51:06,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:06,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 18:51:06,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:07,020 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 15 treesize of output 11 [2021-11-25 18:51:08,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:51:08,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:08,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:09,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:09,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:09,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:09,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:09,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:09,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715673740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:09,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132522581] [2021-11-25 18:51:09,495 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:09,495 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:09,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:09,495 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:09,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:09,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:09,516 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:09,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:09,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:09,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:51:09,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:09,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:09,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:09,567 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:09,586 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:09,586 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 195 treesize of output 198 [2021-11-25 18:51:09,629 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 18 treesize of output 14 [2021-11-25 18:51:09,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:10,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26392#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:10,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:10,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:10,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 77 [2021-11-25 18:51:10,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165648020] [2021-11-25 18:51:10,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:10,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 18:51:10,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:10,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 18:51:10,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=6424, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 18:51:10,222 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 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 18:51:12,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:12,930 INFO L93 Difference]: Finished difference Result 107 states and 108 transitions. [2021-11-25 18:51:12,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 18:51:12,931 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-25 18:51:12,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:12,932 INFO L225 Difference]: With dead ends: 107 [2021-11-25 18:51:12,932 INFO L226 Difference]: Without dead ends: 105 [2021-11-25 18:51:12,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 261 SyntacticMatches, 6 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=406, Invalid=11366, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 18:51:12,933 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 32 mSDsluCounter, 1498 mSDsCounter, 0 mSdLazyCounter, 4734 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 1496 SdHoareTripleChecker+Invalid, 4832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 4734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:12,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 1496 Invalid, 4832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 4734 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 18:51:12,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-25 18:51:12,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-11-25 18:51:12,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 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 18:51:12,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-11-25 18:51:12,977 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 99 [2021-11-25 18:51:12,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:12,977 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-11-25 18:51:12,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 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 18:51:12,978 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-11-25 18:51:12,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-25 18:51:12,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:12,978 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1, 1] [2021-11-25 18:51:13,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:13,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-25 18:51:13,184 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:13,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:13,184 INFO L85 PathProgramCache]: Analyzing trace with hash 429871132, now seen corresponding path program 44 times [2021-11-25 18:51:13,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:13,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322657987] [2021-11-25 18:51:13,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:13,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:13,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 806 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:14,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:14,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322657987] [2021-11-25 18:51:14,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322657987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:14,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651275288] [2021-11-25 18:51:14,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:51:14,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:14,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:14,033 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:14,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 18:51:18,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 18:51:18,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:51:18,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 18:51:18,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:19,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:19,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:19,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651275288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:19,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318001786] [2021-11-25 18:51:19,477 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:19,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:19,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:19,477 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:19,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:19,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:19,496 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:51:19,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:51:19,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:19,512 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:19,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:19,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:19,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:19,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:19,575 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:19,594 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:19,594 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 195 treesize of output 198 [2021-11-25 18:51:19,636 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 18 treesize of output 14 [2021-11-25 18:51:19,682 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:20,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27447#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:20,034 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:20,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:20,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2021-11-25 18:51:20,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170770127] [2021-11-25 18:51:20,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:20,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-25 18:51:20,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:20,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-25 18:51:20,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1448, Invalid=5524, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 18:51:20,036 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 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 18:51:20,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:20,625 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2021-11-25 18:51:20,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 18:51:20,626 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 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 102 [2021-11-25 18:51:20,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:20,626 INFO L225 Difference]: With dead ends: 188 [2021-11-25 18:51:20,626 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 18:51:20,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3097 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2444, Invalid=9112, Unknown=0, NotChecked=0, Total=11556 [2021-11-25 18:51:20,627 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 356 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:20,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [356 Valid, 193 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:51:20,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 18:51:20,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 104. [2021-11-25 18:51:20,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:20,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2021-11-25 18:51:20,649 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 102 [2021-11-25 18:51:20,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:20,649 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2021-11-25 18:51:20,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 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 18:51:20,649 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2021-11-25 18:51:20,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 18:51:20,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:20,650 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2021-11-25 18:51:20,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-25 18:51:20,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:20,850 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:20,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:20,851 INFO L85 PathProgramCache]: Analyzing trace with hash 310070274, now seen corresponding path program 45 times [2021-11-25 18:51:20,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:20,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299649928] [2021-11-25 18:51:20,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:20,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:20,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:22,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:22,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:22,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299649928] [2021-11-25 18:51:22,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299649928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:22,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411472922] [2021-11-25 18:51:22,549 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:51:22,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:22,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:22,550 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:22,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 18:51:22,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:51:22,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:51:22,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-25 18:51:22,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:22,886 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 15 treesize of output 11 [2021-11-25 18:51:24,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:51:24,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:24,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:25,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:25,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:25,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:25,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:25,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:25,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411472922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:25,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321833457] [2021-11-25 18:51:25,430 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:25,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:25,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:25,431 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:25,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:25,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:25,459 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:51:25,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:51:25,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:25,482 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:25,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:25,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:25,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:25,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:25,543 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:25,567 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:25,568 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 195 treesize of output 198 [2021-11-25 18:51:25,646 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 18 treesize of output 14 [2021-11-25 18:51:25,705 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:26,237 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28613#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:26,237 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:26,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:26,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 80 [2021-11-25 18:51:26,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802677765] [2021-11-25 18:51:26,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:26,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-25 18:51:26,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:26,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-25 18:51:26,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=6914, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 18:51:26,238 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 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 18:51:29,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:29,032 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2021-11-25 18:51:29,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-25 18:51:29,033 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-25 18:51:29,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:29,033 INFO L225 Difference]: With dead ends: 111 [2021-11-25 18:51:29,033 INFO L226 Difference]: Without dead ends: 109 [2021-11-25 18:51:29,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 272 SyntacticMatches, 6 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1621 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=421, Invalid=12235, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 18:51:29,035 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 34 mSDsluCounter, 1509 mSDsCounter, 0 mSdLazyCounter, 4868 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 1507 SdHoareTripleChecker+Invalid, 4971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 4868 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:29,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 1507 Invalid, 4971 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 4868 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 18:51:29,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-25 18:51:29,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-11-25 18:51:29,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:29,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-25 18:51:29,067 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 103 [2021-11-25 18:51:29,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:29,068 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-25 18:51:29,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 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 18:51:29,068 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-25 18:51:29,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-25 18:51:29,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:29,069 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1] [2021-11-25 18:51:29,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-25 18:51:29,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-25 18:51:29,284 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:29,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:29,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1166327493, now seen corresponding path program 46 times [2021-11-25 18:51:29,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:29,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065368773] [2021-11-25 18:51:29,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:29,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:29,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:30,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:30,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:30,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065368773] [2021-11-25 18:51:30,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065368773] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:30,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669947942] [2021-11-25 18:51:30,140 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:51:30,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:30,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:30,153 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:30,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 18:51:30,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:30,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 18:51:30,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:31,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:31,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:31,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:31,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669947942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:31,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1838956127] [2021-11-25 18:51:31,915 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:31,915 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:31,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:31,916 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:31,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:31,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:31,959 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:31,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:31,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:31,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:51:31,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:31,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:51:32,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:32,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:32,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:32,039 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:51:32,039 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 202 treesize of output 199 [2021-11-25 18:51:32,065 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 18 treesize of output 14 [2021-11-25 18:51:32,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:32,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29709#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:32,471 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:32,471 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:32,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 82 [2021-11-25 18:51:32,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795639738] [2021-11-25 18:51:32,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:32,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-25 18:51:32,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:32,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-25 18:51:32,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=5925, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 18:51:32,473 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:33,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:33,046 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2021-11-25 18:51:33,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 18:51:33,047 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-25 18:51:33,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:33,047 INFO L225 Difference]: With dead ends: 195 [2021-11-25 18:51:33,047 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 18:51:33,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3325 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2632, Invalid=9800, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 18:51:33,049 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 356 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:33,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [356 Valid, 203 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:51:33,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 18:51:33,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2021-11-25 18:51:33,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:33,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2021-11-25 18:51:33,081 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 106 [2021-11-25 18:51:33,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:33,081 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2021-11-25 18:51:33,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:51:33,082 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2021-11-25 18:51:33,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 18:51:33,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:33,082 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2021-11-25 18:51:33,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:33,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 18:51:33,283 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:33,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:33,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1416963551, now seen corresponding path program 47 times [2021-11-25 18:51:33,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:33,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233040399] [2021-11-25 18:51:33,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:33,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:33,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:34,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:34,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:34,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233040399] [2021-11-25 18:51:34,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233040399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:34,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970013644] [2021-11-25 18:51:34,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:51:34,997 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:34,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:34,997 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:34,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 18:51:40,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-25 18:51:40,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:51:40,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-25 18:51:40,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:40,589 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 15 treesize of output 11 [2021-11-25 18:51:42,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:51:42,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:42,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:43,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:43,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:43,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:43,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:43,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:43,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970013644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:43,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1092489325] [2021-11-25 18:51:43,294 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:43,294 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:43,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:43,294 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:43,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:43,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:43,324 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:43,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:43,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:43,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:51:43,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:43,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:43,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:43,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:43,413 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:43,414 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 195 treesize of output 198 [2021-11-25 18:51:43,469 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 18 treesize of output 14 [2021-11-25 18:51:43,528 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:44,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30920#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:44,145 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:44,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:44,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 83 [2021-11-25 18:51:44,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482780228] [2021-11-25 18:51:44,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:44,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 18:51:44,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:44,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 18:51:44,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7422, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 18:51:44,146 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 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 18:51:47,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:47,175 INFO L93 Difference]: Finished difference Result 115 states and 116 transitions. [2021-11-25 18:51:47,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-25 18:51:47,176 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2021-11-25 18:51:47,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:47,177 INFO L225 Difference]: With dead ends: 115 [2021-11-25 18:51:47,177 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 18:51:47,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 283 SyntacticMatches, 6 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1737 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=436, Invalid=13136, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 18:51:47,178 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 36 mSDsluCounter, 1673 mSDsCounter, 0 mSdLazyCounter, 5327 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 1671 SdHoareTripleChecker+Invalid, 5435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 5327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:47,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 1671 Invalid, 5435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 5327 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 18:51:47,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 18:51:47,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 111. [2021-11-25 18:51:47,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 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 18:51:47,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2021-11-25 18:51:47,203 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 107 [2021-11-25 18:51:47,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:47,203 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2021-11-25 18:51:47,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 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 18:51:47,204 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2021-11-25 18:51:47,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-25 18:51:47,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:47,204 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1, 1] [2021-11-25 18:51:47,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:47,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 18:51:47,432 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:47,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:47,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1817769284, now seen corresponding path program 48 times [2021-11-25 18:51:47,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:47,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626000713] [2021-11-25 18:51:47,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:47,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:47,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 951 proven. 427 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:48,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:48,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626000713] [2021-11-25 18:51:48,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626000713] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:48,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609098661] [2021-11-25 18:51:48,385 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:51:48,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:48,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:48,392 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:48,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 18:51:48,613 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:51:48,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:51:48,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 18:51:48,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:50,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:50,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:50,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:50,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609098661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:50,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209125689] [2021-11-25 18:51:50,353 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:50,353 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:50,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:50,354 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:50,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:50,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:50,379 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:50,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:50,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:50,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:51:50,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:50,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:51:50,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:50,445 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:51:50,470 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:51:50,470 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 195 treesize of output 198 [2021-11-25 18:51:50,509 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 18 treesize of output 14 [2021-11-25 18:51:50,568 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:51,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32057#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:51,035 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:51,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:51,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2021-11-25 18:51:51,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182407270] [2021-11-25 18:51:51,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:51,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-25 18:51:51,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:51,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-25 18:51:51,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1670, Invalid=6340, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 18:51:51,037 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 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 18:51:51,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:51,660 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2021-11-25 18:51:51,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-25 18:51:51,661 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 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 110 [2021-11-25 18:51:51,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:51,661 INFO L225 Difference]: With dead ends: 202 [2021-11-25 18:51:51,670 INFO L226 Difference]: Without dead ends: 118 [2021-11-25 18:51:51,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3561 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2827, Invalid=10513, Unknown=0, NotChecked=0, Total=13340 [2021-11-25 18:51:51,672 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 256 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:51,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 276 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 558 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:51:51,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-25 18:51:51,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 112. [2021-11-25 18:51:51,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 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 18:51:51,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2021-11-25 18:51:51,699 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2021-11-25 18:51:51,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:51,700 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2021-11-25 18:51:51,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 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 18:51:51,700 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2021-11-25 18:51:51,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-25 18:51:51,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:51,701 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2021-11-25 18:51:51,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:51,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 18:51:51,916 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:51,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:51,916 INFO L85 PathProgramCache]: Analyzing trace with hash -808206174, now seen corresponding path program 49 times [2021-11-25 18:51:51,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:51,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569571284] [2021-11-25 18:51:51,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:51,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:52,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:53,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:53,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:53,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569571284] [2021-11-25 18:51:53,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1569571284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:53,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664773648] [2021-11-25 18:51:53,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:51:53,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:53,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:53,748 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:53,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 18:51:53,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:53,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-25 18:51:53,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:54,105 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 15 treesize of output 11 [2021-11-25 18:51:56,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:51:56,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:56,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:56,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:56,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:56,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:51:56,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:51:57,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:57,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664773648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:57,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143568081] [2021-11-25 18:51:57,067 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:51:57,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:57,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:57,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:57,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:57,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,091 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:51:57,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:51:57,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:51:57,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:51:57,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:51:57,152 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:51:57,152 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 202 treesize of output 199 [2021-11-25 18:51:57,179 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 18 treesize of output 14 [2021-11-25 18:51:57,250 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:59,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33313#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:51:59,890 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:59,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:59,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 86 [2021-11-25 18:51:59,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368346999] [2021-11-25 18:51:59,890 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:59,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 18:51:59,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:59,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 18:51:59,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=7948, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 18:51:59,892 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 86 states, 86 states have (on average 2.255813953488372) internal successors, (194), 86 states have internal predecessors, (194), 0 states have call successors, (0), 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 18:52:03,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:03,245 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2021-11-25 18:52:03,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-25 18:52:03,246 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 2.255813953488372) internal successors, (194), 86 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-25 18:52:03,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:03,247 INFO L225 Difference]: With dead ends: 119 [2021-11-25 18:52:03,247 INFO L226 Difference]: Without dead ends: 117 [2021-11-25 18:52:03,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 267 SyntacticMatches, 33 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2718 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=451, Invalid=14069, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 18:52:03,248 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 36 mSDsluCounter, 1818 mSDsCounter, 0 mSdLazyCounter, 5833 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 1816 SdHoareTripleChecker+Invalid, 5944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 5833 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:03,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 1816 Invalid, 5944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 5833 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 18:52:03,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-25 18:52:03,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-11-25 18:52:03,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0175438596491229) internal successors, (116), 114 states have internal predecessors, (116), 0 states have call successors, (0), 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 18:52:03,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2021-11-25 18:52:03,278 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2021-11-25 18:52:03,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:03,278 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2021-11-25 18:52:03,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 2.255813953488372) internal successors, (194), 86 states have internal predecessors, (194), 0 states have call successors, (0), 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 18:52:03,279 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2021-11-25 18:52:03,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-25 18:52:03,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:03,280 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1, 1] [2021-11-25 18:52:03,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-25 18:52:03,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:03,484 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:03,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:03,484 INFO L85 PathProgramCache]: Analyzing trace with hash 321325211, now seen corresponding path program 50 times [2021-11-25 18:52:03,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:03,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745177199] [2021-11-25 18:52:03,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:03,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:03,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:04,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1028 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:04,586 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:04,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745177199] [2021-11-25 18:52:04,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745177199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:04,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122080731] [2021-11-25 18:52:04,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:52:04,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:04,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:04,588 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:04,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 18:52:11,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-25 18:52:11,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:52:12,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 18:52:12,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:13,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:13,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:13,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122080731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:13,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1192509987] [2021-11-25 18:52:13,648 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:52:13,648 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:13,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:13,648 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:13,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:13,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,670 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:52:13,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:52:13,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:52:13,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:52:13,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:13,743 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:52:13,744 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 202 treesize of output 199 [2021-11-25 18:52:13,781 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 18 treesize of output 14 [2021-11-25 18:52:13,829 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:14,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34491#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:52:14,214 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:14,214 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:14,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 88 [2021-11-25 18:52:14,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779198454] [2021-11-25 18:52:14,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:14,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-25 18:52:14,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:14,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-25 18:52:14,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1787, Invalid=6769, Unknown=0, NotChecked=0, Total=8556 [2021-11-25 18:52:14,217 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:14,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:14,913 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2021-11-25 18:52:14,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 18:52:14,913 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-25 18:52:14,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:14,914 INFO L225 Difference]: With dead ends: 209 [2021-11-25 18:52:14,914 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 18:52:14,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3805 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3029, Invalid=11251, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 18:52:14,915 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 368 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:14,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [368 Valid, 279 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:52:14,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 18:52:14,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 116. [2021-11-25 18:52:14,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.017391304347826) internal successors, (117), 115 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:14,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2021-11-25 18:52:14,939 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 114 [2021-11-25 18:52:14,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:14,939 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2021-11-25 18:52:14,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:14,940 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2021-11-25 18:52:14,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 18:52:14,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:14,941 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2021-11-25 18:52:14,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-25 18:52:15,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:15,147 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:15,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:15,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1553619841, now seen corresponding path program 51 times [2021-11-25 18:52:15,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:15,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631887573] [2021-11-25 18:52:15,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:15,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:15,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:17,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:17,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631887573] [2021-11-25 18:52:17,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631887573] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426989994] [2021-11-25 18:52:17,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:52:17,288 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:17,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:17,289 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:17,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 18:52:17,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:52:17,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:52:17,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-25 18:52:17,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:17,614 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 15 treesize of output 11 [2021-11-25 18:52:19,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:52:19,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:19,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:20,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:52:20,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:52:20,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:52:20,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:52:20,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:20,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426989994] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:20,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581953261] [2021-11-25 18:52:20,656 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:52:20,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:20,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:20,656 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:20,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:20,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:20,692 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:52:20,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:52:20,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:20,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:52:20,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:20,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:52:20,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:20,746 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:52:20,765 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:52:20,766 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 195 treesize of output 198 [2021-11-25 18:52:20,808 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 18 treesize of output 14 [2021-11-25 18:52:20,856 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:21,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35792#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:52:21,461 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:21,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:21,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 89 [2021-11-25 18:52:21,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29088013] [2021-11-25 18:52:21,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:21,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 18:52:21,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:21,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 18:52:21,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8492, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 18:52:21,463 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 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 18:52:25,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:25,105 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2021-11-25 18:52:25,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-25 18:52:25,106 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-25 18:52:25,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:25,107 INFO L225 Difference]: With dead ends: 123 [2021-11-25 18:52:25,107 INFO L226 Difference]: Without dead ends: 121 [2021-11-25 18:52:25,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 305 SyntacticMatches, 6 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1981 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=466, Invalid=15034, Unknown=0, NotChecked=0, Total=15500 [2021-11-25 18:52:25,108 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 38 mSDsluCounter, 1993 mSDsCounter, 0 mSdLazyCounter, 6302 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 1993 SdHoareTripleChecker+Invalid, 6418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 6302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:25,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 1993 Invalid, 6418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 6302 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 18:52:25,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-25 18:52:25,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2021-11-25 18:52:25,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:25,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2021-11-25 18:52:25,132 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 115 [2021-11-25 18:52:25,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:25,133 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2021-11-25 18:52:25,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 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 18:52:25,133 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2021-11-25 18:52:25,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-25 18:52:25,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:25,134 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1] [2021-11-25 18:52:25,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-25 18:52:25,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:25,341 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:25,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:25,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1325895004, now seen corresponding path program 52 times [2021-11-25 18:52:25,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:25,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655336333] [2021-11-25 18:52:25,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:25,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:25,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:26,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:26,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:26,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655336333] [2021-11-25 18:52:26,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655336333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:26,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121996756] [2021-11-25 18:52:26,397 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:52:26,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:26,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:26,398 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:26,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 18:52:26,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:26,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 18:52:26,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:28,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:28,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:28,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:28,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121996756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:28,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [640898147] [2021-11-25 18:52:28,392 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:52:28,392 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:28,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:28,392 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:28,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:28,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:28,416 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:52:28,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:52:28,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:28,436 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:52:28,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:52:28,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:28,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:52:28,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:28,508 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:52:28,534 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:52:28,534 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 195 treesize of output 198 [2021-11-25 18:52:28,578 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 18 treesize of output 14 [2021-11-25 18:52:28,639 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:29,157 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37011#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:52:29,157 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:29,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:29,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2021-11-25 18:52:29,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944173414] [2021-11-25 18:52:29,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:29,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 18:52:29,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:29,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 18:52:29,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1908, Invalid=7212, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 18:52:29,159 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:29,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:29,868 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2021-11-25 18:52:29,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-25 18:52:29,868 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-25 18:52:29,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:29,872 INFO L225 Difference]: With dead ends: 216 [2021-11-25 18:52:29,873 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 18:52:29,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4057 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3238, Invalid=12014, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 18:52:29,875 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 340 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:29,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 288 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:52:29,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 18:52:29,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 120. [2021-11-25 18:52:29,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:29,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2021-11-25 18:52:29,913 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 118 [2021-11-25 18:52:29,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:29,913 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2021-11-25 18:52:29,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:29,914 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2021-11-25 18:52:29,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 18:52:29,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:29,914 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2021-11-25 18:52:29,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:30,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:30,124 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:30,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:30,124 INFO L85 PathProgramCache]: Analyzing trace with hash 925564226, now seen corresponding path program 53 times [2021-11-25 18:52:30,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:30,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252208761] [2021-11-25 18:52:30,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:30,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:32,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:32,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:32,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252208761] [2021-11-25 18:52:32,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252208761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:32,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873047066] [2021-11-25 18:52:32,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:52:32,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:32,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:32,255 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:32,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 18:52:41,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-11-25 18:52:41,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:52:41,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-25 18:52:41,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:41,992 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 15 treesize of output 11 [2021-11-25 18:52:44,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:52:44,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:44,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:45,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:52:45,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:52:45,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:52:45,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:52:45,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:45,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873047066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:45,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1935068609] [2021-11-25 18:52:45,167 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:52:45,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:45,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:45,167 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:45,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:45,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,206 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:52:45,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:52:45,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,223 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:52:45,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:52:45,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:52:45,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:45,304 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:52:45,305 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 202 treesize of output 199 [2021-11-25 18:52:45,341 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 18 treesize of output 14 [2021-11-25 18:52:45,404 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:49,124 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38357#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:52:49,124 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:49,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:49,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 92 [2021-11-25 18:52:49,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709546543] [2021-11-25 18:52:49,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:49,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-25 18:52:49,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:49,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-25 18:52:49,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=9054, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 18:52:49,127 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 92 states, 92 states have (on average 2.260869565217391) internal successors, (208), 92 states have internal predecessors, (208), 0 states have call successors, (0), 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 18:52:52,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:52,854 INFO L93 Difference]: Finished difference Result 127 states and 128 transitions. [2021-11-25 18:52:52,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-25 18:52:52,854 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 2.260869565217391) internal successors, (208), 92 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2021-11-25 18:52:52,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:52,855 INFO L225 Difference]: With dead ends: 127 [2021-11-25 18:52:52,855 INFO L226 Difference]: Without dead ends: 125 [2021-11-25 18:52:52,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 287 SyntacticMatches, 35 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=481, Invalid=16031, Unknown=0, NotChecked=0, Total=16512 [2021-11-25 18:52:52,857 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 38 mSDsluCounter, 2214 mSDsCounter, 0 mSdLazyCounter, 6583 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 2212 SdHoareTripleChecker+Invalid, 6702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 6583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:52,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 2212 Invalid, 6702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 6583 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 18:52:52,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-25 18:52:52,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-11-25 18:52:52,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:52,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2021-11-25 18:52:52,886 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 119 [2021-11-25 18:52:52,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:52,887 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2021-11-25 18:52:52,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 2.260869565217391) internal successors, (208), 92 states have internal predecessors, (208), 0 states have call successors, (0), 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 18:52:52,887 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2021-11-25 18:52:52,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 18:52:52,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:52,887 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1, 1] [2021-11-25 18:52:52,911 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-25 18:52:53,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-25 18:52:53,088 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:53,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:53,088 INFO L85 PathProgramCache]: Analyzing trace with hash -201390085, now seen corresponding path program 54 times [2021-11-25 18:52:53,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:53,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820026573] [2021-11-25 18:52:53,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:53,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:53,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1191 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:54,233 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:54,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820026573] [2021-11-25 18:52:54,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820026573] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:54,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406245828] [2021-11-25 18:52:54,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:52:54,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:54,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:54,234 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:54,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 18:52:54,508 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:52:54,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:52:54,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 18:52:54,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:56,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:56,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:56,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:52:56,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406245828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:56,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1633122438] [2021-11-25 18:52:56,313 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:52:56,314 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:56,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:56,314 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:56,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:56,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:56,339 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:52:56,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:52:56,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:56,356 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:52:56,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:52:56,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:56,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:52:56,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:52:56,398 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:52:56,417 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:52:56,417 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 195 treesize of output 198 [2021-11-25 18:52:56,460 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 18 treesize of output 14 [2021-11-25 18:52:56,508 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:56,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39617#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:52:56,904 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:56,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:56,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 94 [2021-11-25 18:52:56,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665231440] [2021-11-25 18:52:56,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:56,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-25 18:52:56,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:56,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-25 18:52:56,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2033, Invalid=7669, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 18:52:56,907 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:57,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:57,639 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2021-11-25 18:52:57,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-25 18:52:57,640 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2021-11-25 18:52:57,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:57,640 INFO L225 Difference]: With dead ends: 223 [2021-11-25 18:52:57,640 INFO L226 Difference]: Without dead ends: 130 [2021-11-25 18:52:57,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4317 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3454, Invalid=12802, Unknown=0, NotChecked=0, Total=16256 [2021-11-25 18:52:57,641 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 360 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:57,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 251 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:52:57,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-25 18:52:57,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 124. [2021-11-25 18:52:57,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:57,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2021-11-25 18:52:57,666 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2021-11-25 18:52:57,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:57,666 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2021-11-25 18:52:57,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:52:57,667 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2021-11-25 18:52:57,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 18:52:57,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:57,668 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2021-11-25 18:52:57,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-25 18:52:57,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-25 18:52:57,872 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:57,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:57,872 INFO L85 PathProgramCache]: Analyzing trace with hash 997987553, now seen corresponding path program 55 times [2021-11-25 18:52:57,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:57,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618518749] [2021-11-25 18:52:57,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:57,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:57,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:00,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:00,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:53:00,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618518749] [2021-11-25 18:53:00,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618518749] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:53:00,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611787577] [2021-11-25 18:53:00,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:53:00,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:53:00,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:00,228 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:53:00,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 18:53:00,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:00,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-25 18:53:00,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:53:00,577 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 15 treesize of output 11 [2021-11-25 18:53:03,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:53:03,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:03,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:53:03,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:53:03,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:53:03,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:53:03,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:53:03,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:03,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611787577] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:53:03,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756546013] [2021-11-25 18:53:03,913 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:53:03,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:53:03,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:53:03,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:53:03,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:53:03,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:03,936 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:53:03,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:53:03,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:03,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:53:03,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:03,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:53:03,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:03,984 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:53:04,002 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:53:04,003 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 195 treesize of output 198 [2021-11-25 18:53:04,034 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 18 treesize of output 14 [2021-11-25 18:53:04,082 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:53:04,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41008#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:53:04,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:53:04,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:53:04,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 95 [2021-11-25 18:53:04,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693228845] [2021-11-25 18:53:04,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:53:04,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-25 18:53:04,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:53:04,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-25 18:53:04,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9634, Unknown=0, NotChecked=0, Total=9900 [2021-11-25 18:53:04,698 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 95 states, 95 states have (on average 2.263157894736842) internal successors, (215), 95 states have internal predecessors, (215), 0 states have call successors, (0), 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 18:53:08,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:53:08,708 INFO L93 Difference]: Finished difference Result 131 states and 132 transitions. [2021-11-25 18:53:08,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-25 18:53:08,708 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 2.263157894736842) internal successors, (215), 95 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-25 18:53:08,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:53:08,709 INFO L225 Difference]: With dead ends: 131 [2021-11-25 18:53:08,709 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 18:53:08,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 327 SyntacticMatches, 6 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=496, Invalid=17060, Unknown=0, NotChecked=0, Total=17556 [2021-11-25 18:53:08,711 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 40 mSDsluCounter, 2409 mSDsCounter, 0 mSdLazyCounter, 7177 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 2407 SdHoareTripleChecker+Invalid, 7301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 7177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:53:08,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 2407 Invalid, 7301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 7177 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 18:53:08,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 18:53:08,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-11-25 18:53:08,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:08,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2021-11-25 18:53:08,741 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 123 [2021-11-25 18:53:08,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:53:08,742 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2021-11-25 18:53:08,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 2.263157894736842) internal successors, (215), 95 states have internal predecessors, (215), 0 states have call successors, (0), 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 18:53:08,742 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2021-11-25 18:53:08,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 18:53:08,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:08,743 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1, 1] [2021-11-25 18:53:08,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 18:53:08,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:53:08,956 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:08,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:08,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1288361980, now seen corresponding path program 56 times [2021-11-25 18:53:08,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:53:08,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494619611] [2021-11-25 18:53:08,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:08,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:53:08,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1277 proven. 553 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:10,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:53:10,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494619611] [2021-11-25 18:53:10,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494619611] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:53:10,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100334838] [2021-11-25 18:53:10,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:53:10,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:53:10,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:10,164 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:53:10,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 18:53:36,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2021-11-25 18:53:36,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:53:36,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 18:53:36,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:53:38,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:38,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:53:38,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:38,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100334838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:53:38,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [454148314] [2021-11-25 18:53:38,441 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:53:38,441 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:53:38,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:53:38,441 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:53:38,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:53:38,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,470 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:53:38,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:53:38,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:53:38,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:53:38,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:38,548 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:53:38,549 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 202 treesize of output 199 [2021-11-25 18:53:38,589 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 18 treesize of output 14 [2021-11-25 18:53:38,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:53:40,538 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42309#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:53:40,539 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:53:40,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:53:40,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2021-11-25 18:53:40,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315860522] [2021-11-25 18:53:40,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:53:40,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-25 18:53:40,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:53:40,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-25 18:53:40,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2162, Invalid=8140, Unknown=0, NotChecked=0, Total=10302 [2021-11-25 18:53:40,541 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:41,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:53:41,289 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2021-11-25 18:53:41,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-25 18:53:41,289 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2021-11-25 18:53:41,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:53:41,290 INFO L225 Difference]: With dead ends: 230 [2021-11-25 18:53:41,290 INFO L226 Difference]: Without dead ends: 134 [2021-11-25 18:53:41,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 309 SyntacticMatches, 31 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7559 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3677, Invalid=13615, Unknown=0, NotChecked=0, Total=17292 [2021-11-25 18:53:41,291 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 492 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 492 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:53:41,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [492 Valid, 271 Invalid, 867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 558 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:53:41,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-25 18:53:41,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 128. [2021-11-25 18:53:41,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:41,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2021-11-25 18:53:41,317 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 126 [2021-11-25 18:53:41,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:53:41,317 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2021-11-25 18:53:41,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:41,317 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2021-11-25 18:53:41,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:53:41,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:41,318 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2021-11-25 18:53:41,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 18:53:41,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-25 18:53:41,544 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:41,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:41,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1133183458, now seen corresponding path program 57 times [2021-11-25 18:53:41,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:53:41,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812090506] [2021-11-25 18:53:41,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:41,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:53:41,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:43,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:43,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:53:43,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812090506] [2021-11-25 18:53:43,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812090506] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:53:43,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995917879] [2021-11-25 18:53:43,955 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:53:43,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:53:43,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:43,956 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:53:43,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-25 18:53:44,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:53:44,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:53:44,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-25 18:53:44,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:53:44,320 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 15 treesize of output 11 [2021-11-25 18:53:46,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:53:47,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:47,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:53:47,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:53:47,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:53:47,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:53:47,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:53:47,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:47,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995917879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:53:47,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769557166] [2021-11-25 18:53:47,800 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:53:47,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:53:47,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:53:47,801 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:53:47,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:53:47,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:47,820 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:53:47,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:53:47,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:47,836 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:53:47,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:53:47,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:47,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:53:47,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:47,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:53:47,899 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:53:47,899 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 195 treesize of output 198 [2021-11-25 18:53:47,927 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 18 treesize of output 14 [2021-11-25 18:53:47,973 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:53:48,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43745#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:53:48,601 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:53:48,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:53:48,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 98 [2021-11-25 18:53:48,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944102672] [2021-11-25 18:53:48,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:53:48,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 18:53:48,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:53:48,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 18:53:48,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=10232, Unknown=0, NotChecked=0, Total=10506 [2021-11-25 18:53:48,602 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:52,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:53:52,700 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2021-11-25 18:53:52,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-25 18:53:52,700 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2021-11-25 18:53:52,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:53:52,701 INFO L225 Difference]: With dead ends: 135 [2021-11-25 18:53:52,701 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 18:53:52,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 338 SyntacticMatches, 6 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2377 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=511, Invalid=18121, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 18:53:52,702 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 42 mSDsluCounter, 2392 mSDsCounter, 0 mSdLazyCounter, 7241 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 2392 SdHoareTripleChecker+Invalid, 7370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 7241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:53:52,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 2392 Invalid, 7370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 7241 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 18:53:52,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 18:53:52,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-11-25 18:53:52,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 0 states have call successors, (0), 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 18:53:52,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2021-11-25 18:53:52,734 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 127 [2021-11-25 18:53:52,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:53:52,734 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2021-11-25 18:53:52,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:52,734 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2021-11-25 18:53:52,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 18:53:52,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:52,735 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1, 1] [2021-11-25 18:53:52,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-25 18:53:52,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 18:53:52,935 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:52,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:52,935 INFO L85 PathProgramCache]: Analyzing trace with hash 230244187, now seen corresponding path program 58 times [2021-11-25 18:53:52,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:53:52,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390338024] [2021-11-25 18:53:52,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:52,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:53:52,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:54,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1366 proven. 587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:54,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:53:54,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390338024] [2021-11-25 18:53:54,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390338024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:53:54,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260408443] [2021-11-25 18:53:54,240 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:53:54,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:53:54,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:54,241 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:53:54,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 18:53:54,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:54,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 18:53:54,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:53:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:56,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:53:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:56,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260408443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:53:56,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1536523571] [2021-11-25 18:53:56,447 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:53:56,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:53:56,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:53:56,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:53:56,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:53:56,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:56,480 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:53:56,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:53:56,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:56,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:53:56,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:56,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:53:56,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:53:56,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:53:56,576 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:53:56,577 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 195 treesize of output 198 [2021-11-25 18:53:56,624 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 18 treesize of output 14 [2021-11-25 18:53:56,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:53:57,085 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45087#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:53:57,085 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:53:57,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:53:57,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 100 [2021-11-25 18:53:57,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863643218] [2021-11-25 18:53:57,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:53:57,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-25 18:53:57,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:53:57,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-25 18:53:57,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2295, Invalid=8625, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 18:53:57,087 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 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 18:53:57,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:53:57,872 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2021-11-25 18:53:57,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 18:53:57,873 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 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 130 [2021-11-25 18:53:57,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:53:57,873 INFO L225 Difference]: With dead ends: 237 [2021-11-25 18:53:57,874 INFO L226 Difference]: Without dead ends: 138 [2021-11-25 18:53:57,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4861 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3907, Invalid=14453, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 18:53:57,875 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 336 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:53:57,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [336 Valid, 302 Invalid, 822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:53:57,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-25 18:53:57,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 132. [2021-11-25 18:53:57,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:53:57,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2021-11-25 18:53:57,917 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 130 [2021-11-25 18:53:57,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:53:57,917 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2021-11-25 18:53:57,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 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 18:53:57,918 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2021-11-25 18:53:57,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 18:53:57,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:57,918 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2021-11-25 18:53:57,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-25 18:53:58,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-25 18:53:58,119 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:58,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:58,119 INFO L85 PathProgramCache]: Analyzing trace with hash -219806143, now seen corresponding path program 59 times [2021-11-25 18:53:58,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:53:58,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931121998] [2021-11-25 18:53:58,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:58,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:53:58,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:00,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:54:00,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931121998] [2021-11-25 18:54:00,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931121998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:54:00,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596480038] [2021-11-25 18:54:00,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:54:00,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:00,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:54:00,649 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:54:00,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 18:54:15,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-25 18:54:15,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:54:15,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 137 conjunts are in the unsatisfiable core [2021-11-25 18:54:15,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:54:15,257 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 15 treesize of output 11 [2021-11-25 18:54:18,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:54:18,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:18,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:54:18,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:54:18,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:54:18,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:54:18,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:54:18,889 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:18,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596480038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:54:18,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134384724] [2021-11-25 18:54:18,890 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:54:18,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:54:18,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:54:18,891 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:54:18,891 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:54:18,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:18,909 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:54:18,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:54:18,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:18,926 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:54:18,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:54:18,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:18,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:54:18,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:18,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:54:18,990 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:54:18,990 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 195 treesize of output 198 [2021-11-25 18:54:19,022 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 18 treesize of output 14 [2021-11-25 18:54:19,068 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:54:19,705 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46568#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:54:19,705 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:54:19,705 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:54:19,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 101 [2021-11-25 18:54:19,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738525077] [2021-11-25 18:54:19,705 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:54:19,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-25 18:54:19,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:54:19,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-25 18:54:19,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=10848, Unknown=0, NotChecked=0, Total=11130 [2021-11-25 18:54:19,707 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 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 18:54:24,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:54:24,337 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2021-11-25 18:54:24,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-25 18:54:24,338 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-25 18:54:24,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:54:24,338 INFO L225 Difference]: With dead ends: 139 [2021-11-25 18:54:24,338 INFO L226 Difference]: Without dead ends: 137 [2021-11-25 18:54:24,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 349 SyntacticMatches, 6 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2517 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=526, Invalid=19214, Unknown=0, NotChecked=0, Total=19740 [2021-11-25 18:54:24,339 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 41 mSDsluCounter, 2761 mSDsCounter, 0 mSdLazyCounter, 8631 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 2759 SdHoareTripleChecker+Invalid, 8762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 8631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:54:24,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 2759 Invalid, 8762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 8631 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-25 18:54:24,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-25 18:54:24,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2021-11-25 18:54:24,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:54:24,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-25 18:54:24,375 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 131 [2021-11-25 18:54:24,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:54:24,375 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-25 18:54:24,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 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 18:54:24,375 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-25 18:54:24,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 18:54:24,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:54:24,376 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1] [2021-11-25 18:54:24,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-25 18:54:24,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-11-25 18:54:24,580 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:54:24,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:54:24,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1585113756, now seen corresponding path program 60 times [2021-11-25 18:54:24,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:54:24,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501348419] [2021-11-25 18:54:24,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:54:24,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:54:24,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:25,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:25,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:54:25,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501348419] [2021-11-25 18:54:25,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501348419] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:54:25,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134350140] [2021-11-25 18:54:25,921 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:54:25,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:25,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:54:25,922 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:54:25,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-25 18:54:26,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:54:26,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:54:26,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 18:54:26,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:54:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:28,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:54:28,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:28,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134350140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:54:28,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874366030] [2021-11-25 18:54:28,282 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:54:28,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:54:28,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:54:28,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:54:28,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:54:28,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,304 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:54:28,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:54:28,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:54:28,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:54:28,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:28,367 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:54:28,367 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 202 treesize of output 199 [2021-11-25 18:54:28,395 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 18 treesize of output 14 [2021-11-25 18:54:28,457 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:54:28,873 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47951#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:54:28,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:54:28,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:54:28,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2021-11-25 18:54:28,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47012413] [2021-11-25 18:54:28,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:54:28,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-25 18:54:28,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:54:28,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-25 18:54:28,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2432, Invalid=9124, Unknown=0, NotChecked=0, Total=11556 [2021-11-25 18:54:28,876 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:54:29,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:54:29,666 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2021-11-25 18:54:29,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-25 18:54:29,667 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-25 18:54:29,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:54:29,667 INFO L225 Difference]: With dead ends: 244 [2021-11-25 18:54:29,667 INFO L226 Difference]: Without dead ends: 142 [2021-11-25 18:54:29,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5145 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4144, Invalid=15316, Unknown=0, NotChecked=0, Total=19460 [2021-11-25 18:54:29,668 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 440 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:54:29,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [440 Valid, 289 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:54:29,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-25 18:54:29,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 136. [2021-11-25 18:54:29,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:54:29,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2021-11-25 18:54:29,697 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2021-11-25 18:54:29,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:54:29,697 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2021-11-25 18:54:29,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:54:29,697 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2021-11-25 18:54:29,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 18:54:29,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:54:29,698 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2021-11-25 18:54:29,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-25 18:54:29,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:29,913 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:54:29,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:54:29,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1065496958, now seen corresponding path program 61 times [2021-11-25 18:54:29,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:54:29,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156951523] [2021-11-25 18:54:29,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:54:29,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:54:30,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:32,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:32,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:54:32,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156951523] [2021-11-25 18:54:32,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156951523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:54:32,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353252912] [2021-11-25 18:54:32,716 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:54:32,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:32,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:54:32,717 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:54:32,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 18:54:32,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:32,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 141 conjunts are in the unsatisfiable core [2021-11-25 18:54:32,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:54:33,134 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 15 treesize of output 11 [2021-11-25 18:54:36,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:54:36,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:36,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:54:36,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:54:36,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:54:36,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:54:36,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:54:37,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:37,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353252912] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:54:37,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [924914511] [2021-11-25 18:54:37,013 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:54:37,013 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:54:37,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:54:37,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:54:37,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:54:37,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,033 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:54:37,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:54:37,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,051 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:54:37,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:54:37,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:54:37,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:54:37,106 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:54:37,107 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 202 treesize of output 199 [2021-11-25 18:54:37,137 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 18 treesize of output 14 [2021-11-25 18:54:37,206 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:54:40,914 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49477#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:54:40,914 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:54:40,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:54:40,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 104 [2021-11-25 18:54:40,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125704330] [2021-11-25 18:54:40,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:54:40,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-25 18:54:40,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:54:40,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-25 18:54:40,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=11482, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 18:54:40,916 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 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 18:54:45,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:54:45,688 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2021-11-25 18:54:45,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-25 18:54:45,689 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-25 18:54:45,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:54:45,690 INFO L225 Difference]: With dead ends: 143 [2021-11-25 18:54:45,690 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 18:54:45,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 327 SyntacticMatches, 39 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3912 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=541, Invalid=20339, Unknown=0, NotChecked=0, Total=20880 [2021-11-25 18:54:45,691 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 44 mSDsluCounter, 2777 mSDsCounter, 0 mSdLazyCounter, 8580 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2777 SdHoareTripleChecker+Invalid, 8717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 8580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:54:45,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 2777 Invalid, 8717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 8580 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-25 18:54:45,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 18:54:45,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-11-25 18:54:45,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:54:45,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2021-11-25 18:54:45,734 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 135 [2021-11-25 18:54:45,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:54:45,735 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2021-11-25 18:54:45,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 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 18:54:45,735 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2021-11-25 18:54:45,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 18:54:45,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:54:45,735 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1] [2021-11-25 18:54:45,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-25 18:54:45,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:45,940 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:54:45,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:54:45,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1888202427, now seen corresponding path program 62 times [2021-11-25 18:54:45,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:54:45,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248884341] [2021-11-25 18:54:45,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:54:45,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:54:45,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:47,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:54:47,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:54:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248884341] [2021-11-25 18:54:47,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248884341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:54:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982419230] [2021-11-25 18:54:47,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:54:47,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:54:47,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:54:47,419 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:54:47,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 18:55:57,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-11-25 18:55:57,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:55:57,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-25 18:55:57,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:59,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:59,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:59,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982419230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:59,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1006494147] [2021-11-25 18:55:59,824 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:55:59,824 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:59,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:59,825 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:59,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:59,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:55:59,846 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:55:59,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:55:59,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:55:59,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:55:59,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:55:59,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:55:59,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:55:59,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:55:59,917 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:55:59,917 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 195 treesize of output 198 [2021-11-25 18:55:59,947 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 18 treesize of output 14 [2021-11-25 18:56:00,008 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:56:00,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50901#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:56:00,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:56:00,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:56:00,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 106 [2021-11-25 18:56:00,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8167876] [2021-11-25 18:56:00,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:00,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-25 18:56:00,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:56:00,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-25 18:56:00,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2573, Invalid=9637, Unknown=0, NotChecked=0, Total=12210 [2021-11-25 18:56:00,444 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:01,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:01,323 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2021-11-25 18:56:01,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-25 18:56:01,324 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-25 18:56:01,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:01,325 INFO L225 Difference]: With dead ends: 251 [2021-11-25 18:56:01,325 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 18:56:01,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5437 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4388, Invalid=16204, Unknown=0, NotChecked=0, Total=20592 [2021-11-25 18:56:01,327 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 436 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 436 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 288 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:01,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [436 Valid, 330 Invalid, 960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [288 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:56:01,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 18:56:01,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2021-11-25 18:56:01,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:01,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2021-11-25 18:56:01,373 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 138 [2021-11-25 18:56:01,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:01,374 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2021-11-25 18:56:01,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:01,374 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2021-11-25 18:56:01,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-25 18:56:01,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:01,375 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1, 1] [2021-11-25 18:56:01,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:01,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:01,595 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:01,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:01,595 INFO L85 PathProgramCache]: Analyzing trace with hash -1928450143, now seen corresponding path program 63 times [2021-11-25 18:56:01,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:56:01,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914912467] [2021-11-25 18:56:01,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:01,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:56:01,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:04,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:04,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:56:04,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914912467] [2021-11-25 18:56:04,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914912467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:56:04,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363945984] [2021-11-25 18:56:04,459 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:56:04,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:04,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:04,460 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:04,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-25 18:56:04,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:56:04,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:05,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-25 18:56:05,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:05,126 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 15 treesize of output 11 [2021-11-25 18:56:08,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:56:08,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:08,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:09,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:56:09,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:56:09,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-25 18:56:09,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 18:56:09,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:09,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363945984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:09,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [42072320] [2021-11-25 18:56:09,378 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:56:09,379 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:56:09,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:56:09,379 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:56:09,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:56:09,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,401 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:56:09,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:56:09,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:56:09,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:56:09,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:09,462 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:56:09,462 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 202 treesize of output 199 [2021-11-25 18:56:09,488 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 18 treesize of output 14 [2021-11-25 18:56:09,538 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:56:10,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52472#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:56:10,215 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:56:10,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:56:10,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 107 [2021-11-25 18:56:10,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051019363] [2021-11-25 18:56:10,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:10,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-25 18:56:10,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:56:10,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-25 18:56:10,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12134, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 18:56:10,217 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 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 18:56:15,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:15,670 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2021-11-25 18:56:15,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-25 18:56:15,670 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-25 18:56:15,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:15,671 INFO L225 Difference]: With dead ends: 147 [2021-11-25 18:56:15,671 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 18:56:15,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 371 SyntacticMatches, 6 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2809 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=556, Invalid=21496, Unknown=0, NotChecked=0, Total=22052 [2021-11-25 18:56:15,673 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 42 mSDsluCounter, 3104 mSDsCounter, 0 mSdLazyCounter, 9748 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 3102 SdHoareTripleChecker+Invalid, 9886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 9748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:15,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 3102 Invalid, 9886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 9748 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-25 18:56:15,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 18:56:15,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 143. [2021-11-25 18:56:15,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:15,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2021-11-25 18:56:15,716 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 139 [2021-11-25 18:56:15,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:15,716 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2021-11-25 18:56:15,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 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 18:56:15,717 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2021-11-25 18:56:15,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 18:56:15,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:15,717 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1] [2021-11-25 18:56:15,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:15,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:15,920 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:15,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:15,920 INFO L85 PathProgramCache]: Analyzing trace with hash -970865348, now seen corresponding path program 64 times [2021-11-25 18:56:15,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:56:15,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520520995] [2021-11-25 18:56:15,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:15,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:56:15,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:17,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:17,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:56:17,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520520995] [2021-11-25 18:56:17,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520520995] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:56:17,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140631984] [2021-11-25 18:56:17,353 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:56:17,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:17,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:17,354 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:17,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 18:56:17,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:17,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-25 18:56:17,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:19,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:19,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:19,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:19,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140631984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:19,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356606637] [2021-11-25 18:56:19,938 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:56:19,938 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:56:19,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:56:19,938 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:56:19,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:56:19,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:19,959 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:56:19,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:56:19,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:19,978 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:56:19,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:56:19,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:19,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:56:20,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:20,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:20,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:56:20,069 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:56:20,070 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 202 treesize of output 199 [2021-11-25 18:56:20,111 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 18 treesize of output 14 [2021-11-25 18:56:20,179 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:56:23,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53937#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:56:23,185 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:56:23,185 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:56:23,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2021-11-25 18:56:23,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525246799] [2021-11-25 18:56:23,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:23,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-25 18:56:23,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:56:23,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-25 18:56:23,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2718, Invalid=10164, Unknown=0, NotChecked=0, Total=12882 [2021-11-25 18:56:23,189 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:24,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:24,117 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2021-11-25 18:56:24,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-25 18:56:24,118 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-25 18:56:24,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:24,119 INFO L225 Difference]: With dead ends: 258 [2021-11-25 18:56:24,119 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 18:56:24,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 349 SyntacticMatches, 35 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9515 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4639, Invalid=17117, Unknown=0, NotChecked=0, Total=21756 [2021-11-25 18:56:24,120 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 468 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:24,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [468 Valid, 306 Invalid, 936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:56:24,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 18:56:24,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 144. [2021-11-25 18:56:24,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:24,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2021-11-25 18:56:24,172 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 142 [2021-11-25 18:56:24,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:24,172 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2021-11-25 18:56:24,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:24,172 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2021-11-25 18:56:24,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 18:56:24,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:24,173 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1, 1] [2021-11-25 18:56:24,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:24,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-25 18:56:24,388 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:24,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:24,388 INFO L85 PathProgramCache]: Analyzing trace with hash -368221406, now seen corresponding path program 65 times [2021-11-25 18:56:24,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:56:24,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084372432] [2021-11-25 18:56:24,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:24,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:56:24,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:27,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:27,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:56:27,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084372432] [2021-11-25 18:56:27,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084372432] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:56:27,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735621431] [2021-11-25 18:56:27,494 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:56:27,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:27,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:27,495 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:27,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-25 18:57:45,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-25 18:57:45,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:57:45,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 152 conjunts are in the unsatisfiable core [2021-11-25 18:57:45,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:57:47,560 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 13 treesize of output 9 [2021-11-25 18:57:51,745 INFO L354 Elim1Store]: treesize reduction 11, result has 21.4 percent of original size [2021-11-25 18:57:51,745 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 42 treesize of output 23 [2021-11-25 18:57:51,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 1717 proven. 664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:57:51,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:57:58,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 18:57:58,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 32 [2021-11-25 18:58:03,116 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 1683 proven. 698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:03,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735621431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:03,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1579626598] [2021-11-25 18:58:03,117 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:58:03,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:58:03,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:58:03,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:58:03,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:58:03,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:03,135 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:58:03,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:58:03,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:03,152 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:58:03,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:58:03,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:03,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:58:03,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:03,197 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:58:03,214 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-25 18:58:03,215 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 195 treesize of output 198 [2021-11-25 18:58:03,256 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 18 treesize of output 14 [2021-11-25 18:58:03,302 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:58:04,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55660#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:58:04,207 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:58:04,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:58:04,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 217 [2021-11-25 18:58:04,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292685197] [2021-11-25 18:58:04,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:58:04,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 217 states [2021-11-25 18:58:04,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:04,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 217 interpolants. [2021-11-25 18:58:04,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3642, Invalid=45420, Unknown=0, NotChecked=0, Total=49062 [2021-11-25 18:58:04,211 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 217 states, 217 states have (on average 1.9539170506912442) internal successors, (424), 217 states have internal predecessors, (424), 0 states have call successors, (0), 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 18:58:16,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:16,114 INFO L93 Difference]: Finished difference Result 253 states and 255 transitions. [2021-11-25 18:58:16,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2021-11-25 18:58:16,115 INFO L78 Accepts]: Start accepts. Automaton has has 217 states, 217 states have (on average 1.9539170506912442) internal successors, (424), 217 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-25 18:58:16,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:16,116 INFO L225 Difference]: With dead ends: 253 [2021-11-25 18:58:16,116 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 18:58:16,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 622 GetRequests, 291 SyntacticMatches, 9 SemanticMatches, 322 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24769 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=8875, Invalid=95777, Unknown=0, NotChecked=0, Total=104652 [2021-11-25 18:58:16,123 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 191 mSDsluCounter, 3058 mSDsCounter, 0 mSdLazyCounter, 9216 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 3094 SdHoareTripleChecker+Invalid, 9783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 9216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:16,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 3094 Invalid, 9783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 9216 Invalid, 0 Unknown, 187 Unchecked, 3.7s Time] [2021-11-25 18:58:16,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 18:58:16,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2021-11-25 18:58:16,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0138888888888888) internal successors, (146), 144 states have internal predecessors, (146), 0 states have call successors, (0), 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 18:58:16,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2021-11-25 18:58:16,173 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2021-11-25 18:58:16,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:16,173 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2021-11-25 18:58:16,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 217 states, 217 states have (on average 1.9539170506912442) internal successors, (424), 217 states have internal predecessors, (424), 0 states have call successors, (0), 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 18:58:16,174 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2021-11-25 18:58:16,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:58:16,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:16,175 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 34, 34, 1, 1, 1, 1, 1] [2021-11-25 18:58:16,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:16,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-25 18:58:16,388 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:16,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:16,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1133871612, now seen corresponding path program 66 times [2021-11-25 18:58:16,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:16,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421273691] [2021-11-25 18:58:16,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:16,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:16,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:19,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2417 backedges. 0 proven. 2417 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:19,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:19,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421273691] [2021-11-25 18:58:19,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421273691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:58:19,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285353427] [2021-11-25 18:58:19,678 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:58:19,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:19,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:19,679 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:58:19,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-25 18:58:20,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:58:20,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:58:20,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 152 conjunts are in the unsatisfiable core [2021-11-25 18:58:20,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:20,148 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 15 treesize of output 11 [2021-11-25 18:58:20,255 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-25 18:58:20,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 18:58:23,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:58:23,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2417 backedges. 0 proven. 2417 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:23,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:58:24,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2021-11-25 18:58:24,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 63 [2021-11-25 18:58:24,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2417 backedges. 0 proven. 2417 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:24,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285353427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:24,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [118960279] [2021-11-25 18:58:24,633 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:58:24,634 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:58:24,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:58:24,634 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:58:24,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:58:24,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,678 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-25 18:58:24,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-25 18:58:24,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,700 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:58:24,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:58:24,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:58:24,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:24,761 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:58:24,761 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 202 treesize of output 199 [2021-11-25 18:58:24,788 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 18 treesize of output 14 [2021-11-25 18:58:24,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:58:29,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57436#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:58:29,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:58:29,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:58:29,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2021-11-25 18:58:29,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527150296] [2021-11-25 18:58:29,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:58:29,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-25 18:58:29,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:29,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-25 18:58:29,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=13259, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 18:58:29,971 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand has 112 states, 112 states have (on average 2.2589285714285716) internal successors, (253), 112 states have internal predecessors, (253), 0 states have call successors, (0), 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 18:58:35,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:35,240 INFO L93 Difference]: Finished difference Result 259 states and 261 transitions. [2021-11-25 18:58:35,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-25 18:58:35,240 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 2.2589285714285716) internal successors, (253), 112 states have internal predecessors, (253), 0 states have call successors, (0), 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 144 [2021-11-25 18:58:35,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:35,242 INFO L225 Difference]: With dead ends: 259 [2021-11-25 18:58:35,242 INFO L226 Difference]: Without dead ends: 257 [2021-11-25 18:58:35,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 348 SyntacticMatches, 42 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4594 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=578, Invalid=23292, Unknown=0, NotChecked=0, Total=23870 [2021-11-25 18:58:35,243 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 43 mSDsluCounter, 3353 mSDsCounter, 0 mSdLazyCounter, 9474 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 9551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 9474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:35,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 3351 Invalid, 9551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 9474 Invalid, 0 Unknown, 1 Unchecked, 3.5s Time] [2021-11-25 18:58:35,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-25 18:58:35,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 149. [2021-11-25 18:58:35,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 148 states have internal predecessors, (151), 0 states have call successors, (0), 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 18:58:35,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-11-25 18:58:35,306 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 144 [2021-11-25 18:58:35,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:35,306 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-11-25 18:58:35,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 2.2589285714285716) internal successors, (253), 112 states have internal predecessors, (253), 0 states have call successors, (0), 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 18:58:35,307 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-11-25 18:58:35,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 18:58:35,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:35,308 INFO L514 BasicCegarLoop]: trace histogram [37, 35, 34, 34, 1, 1, 1, 1, 1] [2021-11-25 18:58:35,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-25 18:58:35,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:35,524 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:35,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:35,524 INFO L85 PathProgramCache]: Analyzing trace with hash 454114914, now seen corresponding path program 67 times [2021-11-25 18:58:35,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:35,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114892034] [2021-11-25 18:58:35,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:35,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:35,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:38,514 INFO L134 CoverageAnalysis]: Checked inductivity of 2454 backedges. 0 proven. 2454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:38,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:38,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114892034] [2021-11-25 18:58:38,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114892034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:58:38,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119207909] [2021-11-25 18:58:38,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:58:38,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:38,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:38,516 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:58:38,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 18:58:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:38,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 726 conjuncts, 155 conjunts are in the unsatisfiable core [2021-11-25 18:58:38,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:39,063 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 15 treesize of output 11 [2021-11-25 18:58:39,122 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:58:39,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:58:39,208 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 18:58:39,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2021-11-25 18:58:42,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2021-11-25 18:58:42,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2454 backedges. 1 proven. 2453 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:42,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:58:43,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 18:58:43,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 60 [2021-11-25 18:58:43,567 INFO L134 CoverageAnalysis]: Checked inductivity of 2454 backedges. 0 proven. 2454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:43,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119207909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:43,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1235360821] [2021-11-25 18:58:43,568 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 18:58:43,568 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:58:43,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:58:43,568 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:58:43,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:58:43,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,590 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 18:58:43,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 18:58:43,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-25 18:58:43,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:58:43,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:58:43,682 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-25 18:58:43,682 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 202 treesize of output 199 [2021-11-25 18:58:43,723 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 18 treesize of output 14 [2021-11-25 18:58:43,778 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:58:48,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59086#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:58:48,059 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:58:48,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:58:48,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 113 [2021-11-25 18:58:48,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504313466] [2021-11-25 18:58:48,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:58:48,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-25 18:58:48,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:48,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-25 18:58:48,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=13488, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 18:58:48,061 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 113 states, 113 states have (on average 2.247787610619469) internal successors, (254), 113 states have internal predecessors, (254), 0 states have call successors, (0), 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 18:58:55,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:55,087 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2021-11-25 18:58:55,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-25 18:58:55,088 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.247787610619469) internal successors, (254), 113 states have internal predecessors, (254), 0 states have call successors, (0), 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 145 [2021-11-25 18:58:55,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:55,089 INFO L225 Difference]: With dead ends: 257 [2021-11-25 18:58:55,089 INFO L226 Difference]: Without dead ends: 255 [2021-11-25 18:58:55,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 351 SyntacticMatches, 42 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7752 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=1003, Invalid=34907, Unknown=0, NotChecked=0, Total=35910 [2021-11-25 18:58:55,090 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 87 mSDsluCounter, 3120 mSDsCounter, 0 mSdLazyCounter, 9967 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 3120 SdHoareTripleChecker+Invalid, 10184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 9967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:55,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 3120 Invalid, 10184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 9967 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-25 18:58:55,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-25 18:58:55,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 148. [2021-11-25 18:58:55,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 0 states have call successors, (0), 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 18:58:55,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2021-11-25 18:58:55,151 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 145 [2021-11-25 18:58:55,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:55,151 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2021-11-25 18:58:55,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.247787610619469) internal successors, (254), 113 states have internal predecessors, (254), 0 states have call successors, (0), 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 18:58:55,152 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2021-11-25 18:58:55,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-25 18:58:55,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:55,153 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1, 1] [2021-11-25 18:58:55,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:55,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-25 18:58:55,360 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:55,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:55,360 INFO L85 PathProgramCache]: Analyzing trace with hash -743796479, now seen corresponding path program 68 times [2021-11-25 18:58:55,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:55,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751134234] [2021-11-25 18:58:55,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:55,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:55,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:58,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:58,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:58,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751134234] [2021-11-25 18:58:58,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751134234] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:58:58,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151081723] [2021-11-25 18:58:58,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:58:58,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:58,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:58,330 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:58:58,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617f25eb-8c1e-4a8a-9114-f85e20bae09f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-25 18:59:46,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-11-25 18:59:46,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:59:46,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-25 18:59:46,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:49,054 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 13 treesize of output 9 [2021-11-25 18:59:53,458 INFO L354 Elim1Store]: treesize reduction 11, result has 21.4 percent of original size [2021-11-25 18:59:53,458 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 42 treesize of output 23 [2021-11-25 18:59:53,566 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 1820 proven. 701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:59:53,566 INFO L328 TraceCheckSpWp]: Computing backward predicates...