./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/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_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/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_2f698deb-7b98-47a9-a997-a900413d295c/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 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:29:11,223 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:29:11,226 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:29:11,284 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:29:11,284 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:29:11,286 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:29:11,287 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:29:11,290 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:29:11,292 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:29:11,294 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:29:11,295 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:29:11,297 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:29:11,298 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:29:11,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:29:11,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:29:11,303 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:29:11,304 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:29:11,306 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:29:11,308 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:29:11,315 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:29:11,318 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:29:11,329 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:29:11,331 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:29:11,332 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:29:11,337 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:29:11,337 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:29:11,338 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:29:11,339 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:29:11,340 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:29:11,354 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:29:11,354 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:29:11,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:29:11,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:29:11,358 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:29:11,360 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:29:11,360 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:29:11,361 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:29:11,362 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:29:11,362 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:29:11,364 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:29:11,365 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:29:11,369 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:29:11,403 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:29:11,403 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:29:11,404 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:29:11,404 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:29:11,405 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:29:11,405 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:29:11,405 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:29:11,406 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:29:11,406 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:29:11,406 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:29:11,407 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:29:11,407 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:29:11,407 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:29:11,407 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:29:11,408 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:29:11,408 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:29:11,408 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:29:11,408 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:29:11,409 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:29:11,409 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:29:11,410 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:29:11,410 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:29:11,410 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:29:11,410 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:29:11,411 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:29:11,411 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:29:11,411 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:29:11,411 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:29:11,412 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:29:11,412 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:29:11,412 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:29:11,412 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:29:11,413 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:29:11,413 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:29:11,413 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:29:11,414 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:29:11,414 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:29:11,414 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:29:11,414 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:29:11,415 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:29:11,415 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:29:11,415 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_2f698deb-7b98-47a9-a997-a900413d295c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f [2021-11-25 20:29:11,714 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:29:11,738 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:29:11,741 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:29:11,742 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:29:11,743 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:29:11,744 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-25 20:29:11,822 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/data/8f4cc66a7/b22eca83ab1a4d52b368d8f4ce1682a1/FLAGe6411b353 [2021-11-25 20:29:12,340 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:29:12,340 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-25 20:29:12,346 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/data/8f4cc66a7/b22eca83ab1a4d52b368d8f4ce1682a1/FLAGe6411b353 [2021-11-25 20:29:12,718 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/data/8f4cc66a7/b22eca83ab1a4d52b368d8f4ce1682a1 [2021-11-25 20:29:12,721 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:29:12,723 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:29:12,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:29:12,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:29:12,733 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:29:12,734 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:29:12" (1/1) ... [2021-11-25 20:29:12,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49adc7a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:12, skipping insertion in model container [2021-11-25 20:29:12,739 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:29:12" (1/1) ... [2021-11-25 20:29:12,750 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:29:12,774 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:29:12,957 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_2f698deb-7b98-47a9-a997-a900413d295c/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-25 20:29:13,009 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:29:13,029 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:29:13,051 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_2f698deb-7b98-47a9-a997-a900413d295c/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-25 20:29:13,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:29:13,101 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:29:13,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13 WrapperNode [2021-11-25 20:29:13,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:29:13,104 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:29:13,104 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:29:13,104 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:29:13,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,124 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,158 INFO L137 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-25 20:29:13,159 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:29:13,160 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:29:13,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:29:13,161 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:29:13,171 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,206 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,208 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,214 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:29:13,217 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:29:13,217 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:29:13,217 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:29:13,219 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (1/1) ... [2021-11-25 20:29:13,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:29:13,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:13,259 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:29:13,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:29:13,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:29:13,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:29:13,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:29:13,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:29:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:29:13,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:29:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:29:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:29:13,416 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:29:13,417 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:29:13,585 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:29:13,626 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:29:13,627 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-25 20:29:13,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:29:13 BoogieIcfgContainer [2021-11-25 20:29:13,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:29:13,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:29:13,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:29:13,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:29:13,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:29:12" (1/3) ... [2021-11-25 20:29:13,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@772ba52a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:29:13, skipping insertion in model container [2021-11-25 20:29:13,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:13" (2/3) ... [2021-11-25 20:29:13,639 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@772ba52a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:29:13, skipping insertion in model container [2021-11-25 20:29:13,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:29:13" (3/3) ... [2021-11-25 20:29:13,641 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2021-11-25 20:29:13,648 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:29:13,648 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:29:13,707 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:29:13,716 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 20:29:13,717 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:29:13,734 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:13,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:29:13,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:13,741 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:13,742 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:13,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:13,750 INFO L85 PathProgramCache]: Analyzing trace with hash 871733126, now seen corresponding path program 1 times [2021-11-25 20:29:13,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:13,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985913665] [2021-11-25 20:29:13,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:13,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:13,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:14,077 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 20:29:14,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:14,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985913665] [2021-11-25 20:29:14,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985913665] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:14,080 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:14,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:29:14,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588826251] [2021-11-25 20:29:14,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:14,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:14,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:14,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:14,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:14,135 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:14,240 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2021-11-25 20:29:14,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:14,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:29:14,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:14,257 INFO L225 Difference]: With dead ends: 24 [2021-11-25 20:29:14,257 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 20:29:14,261 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 20:29:14,273 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:14,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:14,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 20:29:14,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 20:29:14,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2021-11-25 20:29:14,325 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2021-11-25 20:29:14,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:14,326 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2021-11-25 20:29:14,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,329 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2021-11-25 20:29:14,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:29:14,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:14,331 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:14,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:29:14,333 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:14,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:14,340 INFO L85 PathProgramCache]: Analyzing trace with hash 280227729, now seen corresponding path program 1 times [2021-11-25 20:29:14,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:14,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854245062] [2021-11-25 20:29:14,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:14,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:14,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:14,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:29:14,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:14,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854245062] [2021-11-25 20:29:14,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854245062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:14,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:14,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:29:14,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526180757] [2021-11-25 20:29:14,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:14,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:29:14,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:14,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:29:14,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:29:14,461 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:14,543 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2021-11-25 20:29:14,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:29:14,545 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 20:29:14,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:14,546 INFO L225 Difference]: With dead ends: 21 [2021-11-25 20:29:14,546 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 20:29:14,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:29:14,550 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:14,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:14,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 20:29:14,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 20:29:14,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-25 20:29:14,560 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2021-11-25 20:29:14,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:14,560 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-25 20:29:14,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,561 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-25 20:29:14,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:29:14,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:14,562 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:14,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:29:14,562 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:14,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:14,564 INFO L85 PathProgramCache]: Analyzing trace with hash 2106682685, now seen corresponding path program 1 times [2021-11-25 20:29:14,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:14,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315283770] [2021-11-25 20:29:14,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:14,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:14,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:14,649 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:29:14,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:14,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315283770] [2021-11-25 20:29:14,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315283770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:14,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294521163] [2021-11-25 20:29:14,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:14,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:14,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:14,655 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:14,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:29:14,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:14,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:29:14,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:14,908 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:29:14,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:29:14,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294521163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:14,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [267423553] [2021-11-25 20:29:14,984 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:14,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:14,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:14,995 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:14,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:15,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,154 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:15,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:15,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:15,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:15,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:15,489 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:15,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:15,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:15,851 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:16,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:16,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:16,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:16,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 20:29:16,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586292187] [2021-11-25 20:29:16,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:16,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:29:16,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:16,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:29:16,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:29:16,066 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:16,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:16,117 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2021-11-25 20:29:16,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:29:16,118 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:29:16,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:16,119 INFO L225 Difference]: With dead ends: 27 [2021-11-25 20:29:16,119 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 20:29:16,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:29:16,122 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:16,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:29:16,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 20:29:16,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 20:29:16,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:16,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 20:29:16,129 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2021-11-25 20:29:16,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:16,129 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 20:29:16,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:16,130 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 20:29:16,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:29:16,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:16,131 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:16,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:16,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:16,358 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:16,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:16,359 INFO L85 PathProgramCache]: Analyzing trace with hash 617571346, now seen corresponding path program 2 times [2021-11-25 20:29:16,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:16,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714685925] [2021-11-25 20:29:16,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:16,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:16,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:16,464 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:29:16,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:16,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714685925] [2021-11-25 20:29:16,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714685925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:16,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067218271] [2021-11-25 20:29:16,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:16,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:16,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:16,473 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:16,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:29:16,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:29:16,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:16,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:29:16,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:16,592 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:29:16,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:16,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:29:16,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067218271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:16,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382714897] [2021-11-25 20:29:16,658 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:16,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:16,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:16,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:16,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:16,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,762 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:16,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:16,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:16,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:16,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,959 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:16,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:17,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:17,257 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:17,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:17,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:17,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:17,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-25 20:29:17,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510616177] [2021-11-25 20:29:17,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:17,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:29:17,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:17,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:29:17,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:29:17,466 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:17,532 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-25 20:29:17,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:29:17,533 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 20:29:17,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:17,534 INFO L225 Difference]: With dead ends: 29 [2021-11-25 20:29:17,534 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 20:29:17,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:29:17,537 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:17,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 7 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:17,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 20:29:17,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 20:29:17,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-25 20:29:17,543 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2021-11-25 20:29:17,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:17,544 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-25 20:29:17,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,545 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-25 20:29:17,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:29:17,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:17,546 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:17,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:17,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:17,769 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:17,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:17,769 INFO L85 PathProgramCache]: Analyzing trace with hash 956916582, now seen corresponding path program 3 times [2021-11-25 20:29:17,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:17,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189319825] [2021-11-25 20:29:17,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:17,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:17,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:18,729 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:18,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:18,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189319825] [2021-11-25 20:29:18,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189319825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:18,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104513415] [2021-11-25 20:29:18,730 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:18,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:18,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:18,731 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:18,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:29:18,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:18,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:18,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:29:18,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:19,374 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:29:19,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:19,943 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-25 20:29:19,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 52 [2021-11-25 20:29:20,057 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-25 20:29:20,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 17 [2021-11-25 20:29:20,115 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:29:20,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104513415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:20,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786175512] [2021-11-25 20:29:20,119 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:20,120 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:20,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:20,120 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:20,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:20,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,179 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:20,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:20,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:20,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:20,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:20,345 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:20,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:20,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:20,580 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:20,947 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '615#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:20,947 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:20,948 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:20,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 27 [2021-11-25 20:29:20,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648554012] [2021-11-25 20:29:20,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:20,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:29:20,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:20,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:29:20,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:29:20,951 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 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 20:29:21,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:21,353 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-11-25 20:29:21,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:29:21,354 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 20:29:21,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:21,355 INFO L225 Difference]: With dead ends: 33 [2021-11-25 20:29:21,355 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:29:21,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 29 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=95, Invalid=961, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:29:21,357 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:21,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 35 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:21,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:29:21,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-25 20:29:21,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:21,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-25 20:29:21,365 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2021-11-25 20:29:21,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:21,365 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-25 20:29:21,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 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 20:29:21,366 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-25 20:29:21,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:29:21,367 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:21,367 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:21,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:21,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:21,568 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:21,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:21,568 INFO L85 PathProgramCache]: Analyzing trace with hash -489495424, now seen corresponding path program 4 times [2021-11-25 20:29:21,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:21,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615461006] [2021-11-25 20:29:21,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:21,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:21,681 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:29:21,682 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:21,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615461006] [2021-11-25 20:29:21,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615461006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:21,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295480904] [2021-11-25 20:29:21,683 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:21,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:21,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:21,684 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:21,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:29:21,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:21,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:29:21,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:21,856 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:29:21,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:21,917 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:29:21,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295480904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:21,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233872669] [2021-11-25 20:29:21,921 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:21,921 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:21,922 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:21,922 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:21,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:21,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:21,978 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:21,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:21,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:21,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:22,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:22,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:22,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:22,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:22,116 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:22,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:22,211 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 16 treesize of output 12 [2021-11-25 20:29:22,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:22,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:22,565 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:22,565 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:22,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-25 20:29:22,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018655870] [2021-11-25 20:29:22,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:22,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 20:29:22,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:22,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 20:29:22,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:29:22,567 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:22,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:22,722 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2021-11-25 20:29:22,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:29:22,723 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 20:29:22,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:22,724 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:29:22,724 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 20:29:22,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:29:22,726 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:22,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:22,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 20:29:22,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 20:29:22,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:22,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-25 20:29:22,733 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2021-11-25 20:29:22,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:22,733 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-25 20:29:22,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:22,734 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-25 20:29:22,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 20:29:22,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:22,735 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:22,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:22,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:22,935 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:22,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:22,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1462786155, now seen corresponding path program 5 times [2021-11-25 20:29:22,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:22,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684862633] [2021-11-25 20:29:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:22,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:22,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:23,045 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:29:23,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:23,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684862633] [2021-11-25 20:29:23,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684862633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:23,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560360129] [2021-11-25 20:29:23,046 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:23,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:23,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:23,047 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:23,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:29:23,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:29:23,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:23,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:29:23,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:23,272 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:29:23,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:23,360 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:29:23,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560360129] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:23,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [854248924] [2021-11-25 20:29:23,363 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:23,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:23,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:23,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:23,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:23,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,420 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:23,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:23,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:23,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:23,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,543 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:23,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:23,633 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 16 treesize of output 12 [2021-11-25 20:29:23,803 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:24,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1156#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:24,050 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:24,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:24,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:29:24,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588689461] [2021-11-25 20:29:24,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:24,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:29:24,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:24,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:29:24,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:29:24,052 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:24,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:24,201 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2021-11-25 20:29:24,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:29:24,205 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 20:29:24,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:24,206 INFO L225 Difference]: With dead ends: 42 [2021-11-25 20:29:24,206 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 20:29:24,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:29:24,208 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:24,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 7 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:24,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 20:29:24,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 20:29:24,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:24,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 20:29:24,215 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2021-11-25 20:29:24,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:24,216 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 20:29:24,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:24,216 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 20:29:24,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:29:24,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:24,218 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:24,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:24,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:24,434 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:24,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:24,434 INFO L85 PathProgramCache]: Analyzing trace with hash 844534749, now seen corresponding path program 6 times [2021-11-25 20:29:24,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:24,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066377117] [2021-11-25 20:29:24,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:24,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:24,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:25,542 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:25,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:25,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066377117] [2021-11-25 20:29:25,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066377117] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:25,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048014914] [2021-11-25 20:29:25,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:25,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:25,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:25,546 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:25,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:29:25,613 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:25,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:25,615 WARN L261 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 20:29:25,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:26,472 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:29:26,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:27,406 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-25 20:29:27,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-25 20:29:27,804 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-25 20:29:27,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-25 20:29:27,874 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:29:27,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048014914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:27,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793839709] [2021-11-25 20:29:27,876 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:27,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:27,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:27,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:27,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:27,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:27,913 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:29:27,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:29:27,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:27,948 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:27,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:27,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:27,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:28,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:28,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:28,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:28,076 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:28,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:28,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:28,246 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:28,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1477#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:28,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:28,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:28,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 18] total 49 [2021-11-25 20:29:28,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727492179] [2021-11-25 20:29:28,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:28,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 20:29:28,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:28,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 20:29:28,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2685, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:29:28,550 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 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 20:29:29,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:29,759 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-25 20:29:29,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:29:29,760 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 20:29:29,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:29,761 INFO L225 Difference]: With dead ends: 41 [2021-11-25 20:29:29,761 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:29:29,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 33 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1234 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=252, Invalid=3654, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 20:29:29,764 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 768 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:29,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 59 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 768 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:29:29,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:29:29,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2021-11-25 20:29:29,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:29,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-25 20:29:29,773 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2021-11-25 20:29:29,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:29,773 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-25 20:29:29,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 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 20:29:29,774 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-25 20:29:29,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:29:29,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:29,775 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:29,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 20:29:30,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:30,002 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:30,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:30,002 INFO L85 PathProgramCache]: Analyzing trace with hash 247414721, now seen corresponding path program 7 times [2021-11-25 20:29:30,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:30,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951805658] [2021-11-25 20:29:30,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:30,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:30,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:30,086 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:29:30,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:30,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951805658] [2021-11-25 20:29:30,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951805658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:30,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583089914] [2021-11-25 20:29:30,087 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:30,087 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:30,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:30,089 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:30,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:29:30,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:30,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:29:30,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:30,258 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:29:30,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:30,317 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:29:30,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583089914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:30,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1664629871] [2021-11-25 20:29:30,319 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:30,320 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:30,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:30,320 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:30,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:30,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,368 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:30,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:30,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:30,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:30,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:30,516 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:30,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:30,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:30,709 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:30,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1799#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:30,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:30,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:30,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-25 20:29:30,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697608208] [2021-11-25 20:29:30,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:30,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:29:30,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:30,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:29:30,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:29:30,871 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:31,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:31,027 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-11-25 20:29:31,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:29:31,028 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 20:29:31,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:31,028 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:29:31,029 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 20:29:31,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:29:31,030 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:31,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:31,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 20:29:31,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-25 20:29:31,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:31,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2021-11-25 20:29:31,038 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2021-11-25 20:29:31,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:31,038 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2021-11-25 20:29:31,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:31,038 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2021-11-25 20:29:31,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:29:31,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:31,040 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:31,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:31,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:31,266 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:31,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:31,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1961221684, now seen corresponding path program 8 times [2021-11-25 20:29:31,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:31,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657453717] [2021-11-25 20:29:31,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:31,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:31,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:31,369 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:29:31,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:31,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657453717] [2021-11-25 20:29:31,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657453717] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:31,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524032929] [2021-11-25 20:29:31,370 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:31,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:31,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:31,390 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:31,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:29:31,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:29:31,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:31,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:29:31,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:31,580 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:29:31,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:31,643 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:29:31,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524032929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:31,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065195401] [2021-11-25 20:29:31,645 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:31,645 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:31,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:31,646 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:31,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:31,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:31,686 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:29:31,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:29:31,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:31,735 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:31,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:31,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:31,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:31,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:31,832 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:31,856 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:31,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:31,976 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 16 treesize of output 12 [2021-11-25 20:29:32,100 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:32,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2174#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:32,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:32,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:32,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 20:29:32,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23116448] [2021-11-25 20:29:32,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:32,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:29:32,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:32,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:29:32,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:29:32,266 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:32,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:32,424 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2021-11-25 20:29:32,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:29:32,425 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 20:29:32,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:32,426 INFO L225 Difference]: With dead ends: 51 [2021-11-25 20:29:32,426 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:29:32,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:29:32,428 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:32,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:32,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:29:32,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 20:29:32,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:32,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-25 20:29:32,435 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2021-11-25 20:29:32,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:32,435 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-25 20:29:32,436 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 20:29:32,436 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-25 20:29:32,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:29:32,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:32,437 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:32,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:32,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:29:32,657 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:32,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:32,658 INFO L85 PathProgramCache]: Analyzing trace with hash 919934790, now seen corresponding path program 9 times [2021-11-25 20:29:32,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:32,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353115445] [2021-11-25 20:29:32,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:32,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:32,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:33,977 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:33,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:33,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353115445] [2021-11-25 20:29:33,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353115445] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:33,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370259057] [2021-11-25 20:29:33,978 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:33,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:33,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:33,988 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:33,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:29:34,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:34,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:34,042 WARN L261 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 20:29:34,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:34,959 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:29:34,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:36,361 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-25 20:29:36,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-25 20:29:36,951 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-25 20:29:36,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-25 20:29:37,019 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:29:37,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370259057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:37,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [546802990] [2021-11-25 20:29:37,022 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:37,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:37,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:37,022 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:37,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:37,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:37,071 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:29:37,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:29:37,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:37,101 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:37,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:37,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:37,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:37,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:37,173 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:37,192 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:37,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:37,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:37,441 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:37,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2565#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:37,925 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:37,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:37,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22, 22] total 59 [2021-11-25 20:29:37,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750586125] [2021-11-25 20:29:37,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:37,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 20:29:37,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:37,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 20:29:37,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=3837, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:29:37,930 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 59 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 59 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:40,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:40,193 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2021-11-25 20:29:40,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:29:40,198 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 59 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 20:29:40,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:40,199 INFO L225 Difference]: With dead ends: 49 [2021-11-25 20:29:40,199 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 20:29:40,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 41 SyntacticMatches, 10 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=343, Invalid=5977, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:29:40,202 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 1180 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:40,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 75 Invalid, 1218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1180 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:29:40,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 20:29:40,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-25 20:29:40,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:40,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-25 20:29:40,212 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 29 [2021-11-25 20:29:40,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:40,213 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-25 20:29:40,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 59 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:40,213 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-25 20:29:40,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 20:29:40,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:40,215 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:40,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:40,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:29:40,426 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:40,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:40,426 INFO L85 PathProgramCache]: Analyzing trace with hash -234145888, now seen corresponding path program 10 times [2021-11-25 20:29:40,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:40,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375203131] [2021-11-25 20:29:40,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:40,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:40,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:40,536 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:29:40,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:40,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375203131] [2021-11-25 20:29:40,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375203131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:40,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373442898] [2021-11-25 20:29:40,538 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:40,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:40,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:40,539 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:40,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:29:40,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:40,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:29:40,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:40,765 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:29:40,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:40,830 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:29:40,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373442898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:40,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962309130] [2021-11-25 20:29:40,832 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:40,833 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:40,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:40,833 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:40,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:40,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:40,874 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:29:40,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:29:40,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:40,913 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:40,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:40,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:40,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:29:40,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:40,980 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:41,000 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:29:41,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:29:41,099 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 16 treesize of output 12 [2021-11-25 20:29:41,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:41,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2964#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:41,412 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:41,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:41,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 20:29:41,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058490963] [2021-11-25 20:29:41,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:41,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:29:41,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:41,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:29:41,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:29:41,415 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:41,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:41,574 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2021-11-25 20:29:41,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:29:41,575 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-25 20:29:41,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:41,578 INFO L225 Difference]: With dead ends: 82 [2021-11-25 20:29:41,578 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 20:29:41,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=650, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:29:41,580 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:41,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 7 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:41,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 20:29:41,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-25 20:29:41,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:41,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-11-25 20:29:41,590 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 30 [2021-11-25 20:29:41,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:41,590 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-11-25 20:29:41,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:41,591 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-11-25 20:29:41,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:29:41,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:41,594 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:41,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:41,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:41,821 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:41,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:41,822 INFO L85 PathProgramCache]: Analyzing trace with hash -671947659, now seen corresponding path program 11 times [2021-11-25 20:29:41,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:41,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301800777] [2021-11-25 20:29:41,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:41,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:41,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:41,963 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:29:41,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:41,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301800777] [2021-11-25 20:29:41,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301800777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:41,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601152566] [2021-11-25 20:29:41,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:41,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:41,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:41,966 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:41,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:29:42,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:29:42,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:42,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:29:42,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:29:42,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:42,272 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:29:42,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601152566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:42,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578869999] [2021-11-25 20:29:42,275 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:42,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:42,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:42,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:42,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:42,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,318 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:42,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:42,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:42,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:42,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:42,413 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:42,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:42,460 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 16 treesize of output 12 [2021-11-25 20:29:42,573 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:42,732 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3416#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:42,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:42,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:42,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 20:29:42,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385172613] [2021-11-25 20:29:42,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:42,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:29:42,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:42,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:29:42,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:29:42,734 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:42,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:42,878 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-11-25 20:29:42,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:29:42,879 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-25 20:29:42,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:42,880 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:29:42,880 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 20:29:42,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:29:42,881 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:42,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 15 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:42,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 20:29:42,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-25 20:29:42,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:42,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-11-25 20:29:42,888 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2021-11-25 20:29:42,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:42,888 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-11-25 20:29:42,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:42,889 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-11-25 20:29:42,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 20:29:42,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:42,890 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:42,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:43,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:43,106 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:43,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:43,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1768952445, now seen corresponding path program 12 times [2021-11-25 20:29:43,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:43,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10542074] [2021-11-25 20:29:43,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:43,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:43,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:44,859 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:44,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:44,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10542074] [2021-11-25 20:29:44,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10542074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:44,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047683808] [2021-11-25 20:29:44,860 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:44,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:44,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:44,866 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:44,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:29:44,932 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:44,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:44,934 WARN L261 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-25 20:29:44,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:46,721 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:46,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:49,246 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-25 20:29:49,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-25 20:29:51,144 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-25 20:29:51,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-25 20:29:51,260 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:51,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047683808] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:51,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504955801] [2021-11-25 20:29:51,262 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:51,263 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:51,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:51,263 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:51,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:51,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,305 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:29:51,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:29:51,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,338 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:51,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:51,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:51,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:51,425 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:51,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:51,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:51,590 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:52,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3883#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:52,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:52,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:52,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 26, 26] total 75 [2021-11-25 20:29:52,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244181453] [2021-11-25 20:29:52,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:52,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-25 20:29:52,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:52,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-25 20:29:52,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=6062, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:29:52,074 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 75 states, 75 states have (on average 1.16) internal successors, (87), 75 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 20:29:54,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:54,892 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2021-11-25 20:29:54,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:29:54,893 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.16) internal successors, (87), 75 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 20:29:54,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:54,893 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:29:54,894 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:29:54,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 47 SyntacticMatches, 8 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2571 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=462, Invalid=9438, Unknown=0, NotChecked=0, Total=9900 [2021-11-25 20:29:54,898 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 1623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:54,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 87 Invalid, 1623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:29:54,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:29:54,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2021-11-25 20:29:54,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:54,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-11-25 20:29:54,908 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2021-11-25 20:29:54,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:54,909 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-11-25 20:29:54,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.16) internal successors, (87), 75 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 20:29:54,909 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-11-25 20:29:54,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:29:54,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:54,910 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:54,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:55,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:29:55,130 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:55,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:55,130 INFO L85 PathProgramCache]: Analyzing trace with hash 875301153, now seen corresponding path program 13 times [2021-11-25 20:29:55,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:55,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133818267] [2021-11-25 20:29:55,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:55,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:55,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:55,273 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:29:55,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:55,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133818267] [2021-11-25 20:29:55,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133818267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:55,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294186392] [2021-11-25 20:29:55,274 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:55,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:55,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:55,276 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:55,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:29:55,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:55,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:29:55,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:55,503 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:29:55,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:55,561 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:29:55,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294186392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:55,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [287416243] [2021-11-25 20:29:55,562 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:55,565 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:55,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:55,566 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:55,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:55,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,612 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:55,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:55,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:55,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:55,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:55,713 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:55,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:55,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:55,849 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:56,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4353#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:56,014 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:56,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:56,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-25 20:29:56,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242712704] [2021-11-25 20:29:56,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:56,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:29:56,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:56,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:29:56,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:29:56,016 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:56,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:56,236 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2021-11-25 20:29:56,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:29:56,237 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 20:29:56,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:56,237 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:29:56,238 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:29:56,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:29:56,239 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:56,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:56,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:29:56,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 20:29:56,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:56,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2021-11-25 20:29:56,249 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 35 [2021-11-25 20:29:56,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:56,249 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2021-11-25 20:29:56,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:56,250 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2021-11-25 20:29:56,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:29:56,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:56,251 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:56,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:56,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:29:56,470 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:56,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:56,470 INFO L85 PathProgramCache]: Analyzing trace with hash -743958164, now seen corresponding path program 14 times [2021-11-25 20:29:56,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:56,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049412965] [2021-11-25 20:29:56,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:56,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:56,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:56,622 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 20:29:56,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:56,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049412965] [2021-11-25 20:29:56,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049412965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:56,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565388446] [2021-11-25 20:29:56,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:56,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:56,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:56,624 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:56,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:29:56,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:29:56,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:56,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:29:56,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:56,869 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 20:29:56,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:56,961 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 20:29:56,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565388446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:56,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [712310470] [2021-11-25 20:29:56,963 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:56,963 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:56,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:56,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:56,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:56,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,008 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:29:57,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:29:57,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:29:57,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:29:57,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:57,111 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:29:57,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:29:57,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:29:57,268 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:57,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4882#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:57,422 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:57,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:57,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 20:29:57,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823092999] [2021-11-25 20:29:57,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:57,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:29:57,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:57,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:29:57,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:29:57,425 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:57,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:57,591 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2021-11-25 20:29:57,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:29:57,592 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-25 20:29:57,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:57,592 INFO L225 Difference]: With dead ends: 69 [2021-11-25 20:29:57,593 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:29:57,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:29:57,594 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:57,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 13 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:57,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:29:57,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 20:29:57,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:57,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-25 20:29:57,602 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2021-11-25 20:29:57,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:57,602 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-25 20:29:57,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:57,603 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-25 20:29:57,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:29:57,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:57,604 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:57,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:57,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:57,821 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:57,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:57,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1584221402, now seen corresponding path program 15 times [2021-11-25 20:29:57,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:57,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984545964] [2021-11-25 20:29:57,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:57,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:57,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:30:00,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:00,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984545964] [2021-11-25 20:30:00,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984545964] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:00,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451296575] [2021-11-25 20:30:00,179 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:30:00,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:00,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:00,180 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:00,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:30:00,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:30:00,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:00,264 WARN L261 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-25 20:30:00,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:02,211 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:30:02,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:05,757 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-25 20:30:05,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-25 20:30:08,855 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-25 20:30:08,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-25 20:30:08,951 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:30:08,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451296575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:08,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561966993] [2021-11-25 20:30:08,952 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:08,953 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:08,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:08,953 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:08,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:08,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:08,995 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:30:08,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:30:09,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:09,023 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:09,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:09,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:09,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:09,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:09,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:09,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:09,123 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:09,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:09,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:09,280 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:09,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5417#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:09,801 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:09,801 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:09,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 30, 30] total 83 [2021-11-25 20:30:09,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146587423] [2021-11-25 20:30:09,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:09,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 20:30:09,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:09,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 20:30:09,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=7368, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 20:30:09,804 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 83 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 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 20:30:14,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:14,155 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2021-11-25 20:30:14,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 20:30:14,155 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 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) Word has length 39 [2021-11-25 20:30:14,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:14,156 INFO L225 Difference]: With dead ends: 65 [2021-11-25 20:30:14,156 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 20:30:14,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3115 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=555, Invalid=11877, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 20:30:14,160 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 2234 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 2295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 2234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:14,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 111 Invalid, 2295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 2234 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 20:30:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 20:30:14,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2021-11-25 20:30:14,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:14,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2021-11-25 20:30:14,181 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2021-11-25 20:30:14,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:14,182 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2021-11-25 20:30:14,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 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 20:30:14,182 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2021-11-25 20:30:14,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:30:14,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:14,183 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:14,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-25 20:30:14,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:30:14,398 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:14,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:14,398 INFO L85 PathProgramCache]: Analyzing trace with hash 722707136, now seen corresponding path program 16 times [2021-11-25 20:30:14,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:14,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040212890] [2021-11-25 20:30:14,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:14,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:14,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:14,556 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 20:30:14,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:14,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040212890] [2021-11-25 20:30:14,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040212890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:14,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346685616] [2021-11-25 20:30:14,557 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:30:14,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:14,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:14,569 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:14,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:30:14,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:14,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:30:14,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:14,832 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 20:30:14,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:14,909 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 20:30:14,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346685616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:14,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842424050] [2021-11-25 20:30:14,913 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:14,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:14,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:14,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:14,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:14,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:14,957 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:30:14,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:30:14,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:14,994 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:14,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:15,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:15,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:15,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:15,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:15,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:15,112 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:15,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:15,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:15,244 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:15,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5958#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:15,428 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:15,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:15,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-25 20:30:15,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617324185] [2021-11-25 20:30:15,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:15,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 20:30:15,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:15,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 20:30:15,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:30:15,429 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:15,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:15,664 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2021-11-25 20:30:15,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:30:15,665 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:30:15,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:15,665 INFO L225 Difference]: With dead ends: 110 [2021-11-25 20:30:15,665 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:30:15,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:30:15,666 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:15,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:15,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:30:15,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 20:30:15,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:15,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-11-25 20:30:15,678 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 40 [2021-11-25 20:30:15,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:15,678 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-11-25 20:30:15,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:15,679 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-11-25 20:30:15,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 20:30:15,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:15,680 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:15,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:15,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:30:15,882 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:15,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:15,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1499657899, now seen corresponding path program 17 times [2021-11-25 20:30:15,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:15,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470848917] [2021-11-25 20:30:15,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:15,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:15,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:16,027 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:30:16,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:16,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470848917] [2021-11-25 20:30:16,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470848917] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:16,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111121442] [2021-11-25 20:30:16,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:16,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:16,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:16,029 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:16,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:30:16,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:30:16,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:16,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:30:16,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:30:16,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:16,393 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:30:16,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111121442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:16,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958245430] [2021-11-25 20:30:16,394 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:16,394 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:16,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:16,395 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:16,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:16,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:16,429 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:16,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:16,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:16,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:16,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:16,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:30:16,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:16,491 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:30:16,509 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:30:16,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:30:16,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:16,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:16,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6564#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:16,878 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:16,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:16,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 20:30:16,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408026343] [2021-11-25 20:30:16,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:16,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:30:16,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:16,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:30:16,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:30:16,880 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:17,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:17,051 INFO L93 Difference]: Finished difference Result 78 states and 90 transitions. [2021-11-25 20:30:17,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:30:17,051 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 20:30:17,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:17,052 INFO L225 Difference]: With dead ends: 78 [2021-11-25 20:30:17,052 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 20:30:17,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:30:17,053 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:17,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:17,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 20:30:17,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 20:30:17,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:17,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-11-25 20:30:17,062 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2021-11-25 20:30:17,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:17,062 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-11-25 20:30:17,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:17,063 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-11-25 20:30:17,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 20:30:17,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:17,063 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:17,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:17,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:17,290 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:17,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:17,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1455167203, now seen corresponding path program 18 times [2021-11-25 20:30:17,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:17,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420634246] [2021-11-25 20:30:17,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:17,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:17,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:20,066 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:30:20,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:20,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420634246] [2021-11-25 20:30:20,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420634246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:20,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111959639] [2021-11-25 20:30:20,067 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:30:20,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:20,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:20,068 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:20,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:30:20,153 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:30:20,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:20,155 WARN L261 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-25 20:30:20,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:22,272 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:30:22,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:27,081 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-25 20:30:27,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-25 20:30:31,749 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-25 20:30:31,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-25 20:30:31,900 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:30:31,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111959639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:31,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033935682] [2021-11-25 20:30:31,902 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:31,902 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:31,902 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:31,903 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:31,903 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:31,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:31,940 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:30:31,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:30:31,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:31,969 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:31,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:31,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:31,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:32,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:32,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:32,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:32,050 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:32,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:32,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:32,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:32,755 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7165#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:32,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:32,755 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:32,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 34, 34] total 89 [2021-11-25 20:30:32,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815670598] [2021-11-25 20:30:32,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:32,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 20:30:32,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:32,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 20:30:32,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=8390, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 20:30:32,757 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 89 states, 89 states have (on average 1.1123595505617978) internal successors, (99), 89 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:37,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:37,744 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2021-11-25 20:30:37,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 20:30:37,745 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.1123595505617978) internal successors, (99), 89 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 20:30:37,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:37,746 INFO L225 Difference]: With dead ends: 73 [2021-11-25 20:30:37,746 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 20:30:37,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 64 SyntacticMatches, 17 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=642, Invalid=13400, Unknown=0, NotChecked=0, Total=14042 [2021-11-25 20:30:37,748 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 2369 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 2439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 2369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:37,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 101 Invalid, 2439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 2369 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 20:30:37,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 20:30:37,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2021-11-25 20:30:37,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:37,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2021-11-25 20:30:37,758 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2021-11-25 20:30:37,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:37,758 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2021-11-25 20:30:37,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.1123595505617978) internal successors, (99), 89 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:37,758 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2021-11-25 20:30:37,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:30:37,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:37,759 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:37,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:37,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:37,959 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:37,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:37,960 INFO L85 PathProgramCache]: Analyzing trace with hash -1118766463, now seen corresponding path program 19 times [2021-11-25 20:30:37,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:37,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862678617] [2021-11-25 20:30:37,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:37,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:37,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:38,137 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 20:30:38,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:38,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862678617] [2021-11-25 20:30:38,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862678617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:38,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365319107] [2021-11-25 20:30:38,138 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:30:38,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:38,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:38,139 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:38,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:30:38,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:38,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:30:38,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 20:30:38,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:38,530 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 20:30:38,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365319107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:38,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [645687106] [2021-11-25 20:30:38,532 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:38,532 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:38,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:38,533 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:38,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:38,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,571 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:38,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:38,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:38,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:38,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:38,667 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:38,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:38,709 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 16 treesize of output 12 [2021-11-25 20:30:38,832 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:39,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7771#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:39,029 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:39,029 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:39,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-25 20:30:39,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299969045] [2021-11-25 20:30:39,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:39,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:30:39,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:39,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:30:39,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:30:39,030 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:39,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:39,287 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2021-11-25 20:30:39,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:30:39,288 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 20:30:39,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:39,289 INFO L225 Difference]: With dead ends: 124 [2021-11-25 20:30:39,289 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 20:30:39,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=330, Invalid=1310, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:30:39,290 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:39,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:39,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 20:30:39,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-25 20:30:39,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:39,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-11-25 20:30:39,300 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 45 [2021-11-25 20:30:39,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:39,300 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-11-25 20:30:39,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:39,301 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-11-25 20:30:39,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 20:30:39,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:39,301 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:39,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:39,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:39,502 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:39,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:39,502 INFO L85 PathProgramCache]: Analyzing trace with hash 469330188, now seen corresponding path program 20 times [2021-11-25 20:30:39,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:39,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162739734] [2021-11-25 20:30:39,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:39,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:39,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:39,705 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:30:39,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:39,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162739734] [2021-11-25 20:30:39,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162739734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:39,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064998653] [2021-11-25 20:30:39,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:39,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:39,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:39,708 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:39,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:30:39,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:30:39,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:39,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:30:39,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:40,135 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:30:40,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:40,270 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:30:40,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064998653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:40,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1542406260] [2021-11-25 20:30:40,272 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:30:40,273 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:40,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:40,273 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:40,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:40,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:40,317 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:40,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:40,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:40,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:40,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:40,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:30:40,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:40,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:30:40,417 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:30:40,417 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 230 treesize of output 229 [2021-11-25 20:30:40,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:40,646 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:40,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8454#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:40,828 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:40,828 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:40,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 20:30:40,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770590705] [2021-11-25 20:30:40,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:40,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:30:40,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:40,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:30:40,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:30:40,829 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:41,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:41,087 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2021-11-25 20:30:41,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:30:41,089 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 20:30:41,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:41,090 INFO L225 Difference]: With dead ends: 87 [2021-11-25 20:30:41,090 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:30:41,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:30:41,091 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 50 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:41,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 15 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:41,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:30:41,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 20:30:41,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:41,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-25 20:30:41,101 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2021-11-25 20:30:41,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:41,101 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-25 20:30:41,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:41,101 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-25 20:30:41,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:30:41,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:41,102 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:41,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:41,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 20:30:41,302 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:41,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:41,303 INFO L85 PathProgramCache]: Analyzing trace with hash 301741830, now seen corresponding path program 21 times [2021-11-25 20:30:41,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:41,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738197105] [2021-11-25 20:30:41,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:41,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:41,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:44,738 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 3 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:30:44,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738197105] [2021-11-25 20:30:44,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738197105] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490776942] [2021-11-25 20:30:44,738 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:30:44,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:44,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:44,740 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:44,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:30:44,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:30:44,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:44,857 WARN L261 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-25 20:30:44,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:47,572 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:30:47,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:54,179 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-25 20:30:54,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-25 20:31:07,675 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-25 20:31:07,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-25 20:31:07,810 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:31:07,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490776942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:07,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449263032] [2021-11-25 20:31:07,811 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:31:07,811 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:07,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:07,811 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:07,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:07,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:07,856 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:07,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:07,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:07,884 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:07,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:07,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:07,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:31:07,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:07,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:07,969 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:31:07,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:31:08,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:08,147 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:08,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9126#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:08,775 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:08,775 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:08,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 38, 38] total 100 [2021-11-25 20:31:08,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866075083] [2021-11-25 20:31:08,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:08,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-25 20:31:08,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:08,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-25 20:31:08,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=10507, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 20:31:08,779 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 100 states, 100 states have (on average 1.1) internal successors, (110), 100 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 20:31:15,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:15,391 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2021-11-25 20:31:15,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:31:15,392 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.1) internal successors, (110), 100 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 49 [2021-11-25 20:31:15,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:15,392 INFO L225 Difference]: With dead ends: 81 [2021-11-25 20:31:15,392 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 20:31:15,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 72 SyntacticMatches, 18 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4815 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=790, Invalid=17300, Unknown=0, NotChecked=0, Total=18090 [2021-11-25 20:31:15,395 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 3128 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 3235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 3128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:15,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 3235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 3128 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 20:31:15,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 20:31:15,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2021-11-25 20:31:15,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:15,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2021-11-25 20:31:15,410 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2021-11-25 20:31:15,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:15,411 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2021-11-25 20:31:15,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.1) internal successors, (110), 100 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 20:31:15,412 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2021-11-25 20:31:15,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:31:15,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:15,412 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:15,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:15,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:15,626 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:15,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:15,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1167448608, now seen corresponding path program 22 times [2021-11-25 20:31:15,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:15,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437087074] [2021-11-25 20:31:15,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:15,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:15,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:15,819 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 20:31:15,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:15,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437087074] [2021-11-25 20:31:15,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437087074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:15,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593875336] [2021-11-25 20:31:15,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:31:15,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:15,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:15,821 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:15,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:31:15,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:15,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:31:15,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:16,155 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 20:31:16,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:16,252 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 20:31:16,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593875336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:16,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [551150656] [2021-11-25 20:31:16,254 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:31:16,254 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:16,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:16,255 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:16,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:16,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,305 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:16,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:16,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:31:16,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:16,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,423 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:16,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:16,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:16,568 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:16,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9805#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:16,827 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:16,827 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:16,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-25 20:31:16,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562958807] [2021-11-25 20:31:16,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:16,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:31:16,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:16,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:31:16,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:31:16,829 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:17,157 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2021-11-25 20:31:17,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:31:17,159 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 20:31:17,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:17,160 INFO L225 Difference]: With dead ends: 138 [2021-11-25 20:31:17,160 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 20:31:17,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=400, Invalid=1580, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:31:17,160 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:17,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:17,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 20:31:17,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-25 20:31:17,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1142857142857143) internal successors, (78), 70 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2021-11-25 20:31:17,172 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 50 [2021-11-25 20:31:17,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:17,172 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2021-11-25 20:31:17,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,172 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2021-11-25 20:31:17,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:31:17,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:17,173 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:17,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:17,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:17,373 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:17,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:17,374 INFO L85 PathProgramCache]: Analyzing trace with hash -418900427, now seen corresponding path program 23 times [2021-11-25 20:31:17,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:17,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172711178] [2021-11-25 20:31:17,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:17,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:17,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:17,581 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 20:31:17,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:17,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172711178] [2021-11-25 20:31:17,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172711178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:17,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364376703] [2021-11-25 20:31:17,582 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:31:17,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:17,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:17,589 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:17,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:31:17,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:31:17,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:17,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:31:17,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 20:31:18,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:18,233 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 20:31:18,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364376703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:18,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1572578289] [2021-11-25 20:31:18,235 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:31:18,235 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:18,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:18,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:18,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:18,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,270 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:18,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:18,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:31:18,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:18,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:18,348 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:18,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:18,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:18,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:18,761 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10573#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:18,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:18,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:18,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-25 20:31:18,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169031163] [2021-11-25 20:31:18,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:18,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:31:18,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:18,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:31:18,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:31:18,763 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:19,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:19,138 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2021-11-25 20:31:19,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:31:19,139 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 20:31:19,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:19,139 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:31:19,139 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 20:31:19,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:31:19,142 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:19,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 11 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:19,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 20:31:19,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-25 20:31:19,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:19,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 20:31:19,157 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2021-11-25 20:31:19,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:19,157 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 20:31:19,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:19,158 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 20:31:19,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 20:31:19,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:19,158 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:19,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:19,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:31:19,374 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:19,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:19,374 INFO L85 PathProgramCache]: Analyzing trace with hash 330831805, now seen corresponding path program 24 times [2021-11-25 20:31:19,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:19,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135982056] [2021-11-25 20:31:19,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:19,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:19,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:23,654 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:23,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:23,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135982056] [2021-11-25 20:31:23,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135982056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:23,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810326347] [2021-11-25 20:31:23,655 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:31:23,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:23,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:23,655 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:23,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:31:23,811 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:31:23,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:23,814 WARN L261 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-25 20:31:23,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:27,403 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:31:27,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:37,453 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-25 20:31:37,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-25 20:31:54,950 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-25 20:31:54,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-25 20:31:55,106 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:31:55,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810326347] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:55,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553984275] [2021-11-25 20:31:55,107 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:31:55,107 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:55,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:55,108 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:55,108 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:55,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,157 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:55,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:55,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,196 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:55,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:55,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:55,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,293 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:55,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:55,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:55,464 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:56,294 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11320#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:56,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:56,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:56,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 42, 42] total 113 [2021-11-25 20:31:56,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220663887] [2021-11-25 20:31:56,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:56,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-25 20:31:56,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:56,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-25 20:31:56,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=13386, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:31:56,297 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 113 states, 113 states have (on average 1.1061946902654867) internal successors, (125), 113 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 20:32:06,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:06,733 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2021-11-25 20:32:06,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-25 20:32:06,734 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.1061946902654867) internal successors, (125), 113 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) Word has length 54 [2021-11-25 20:32:06,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:06,735 INFO L225 Difference]: With dead ends: 89 [2021-11-25 20:32:06,735 INFO L226 Difference]: Without dead ends: 86 [2021-11-25 20:32:06,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 80 SyntacticMatches, 17 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5604 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=927, Invalid=22635, Unknown=0, NotChecked=0, Total=23562 [2021-11-25 20:32:06,737 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 3736 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 3856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 3736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:06,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 135 Invalid, 3856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 3736 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-25 20:32:06,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-25 20:32:06,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-11-25 20:32:06,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:06,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2021-11-25 20:32:06,756 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2021-11-25 20:32:06,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:06,757 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2021-11-25 20:32:06,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.1061946902654867) internal successors, (125), 113 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 20:32:06,757 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2021-11-25 20:32:06,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:32:06,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:06,758 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:06,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:06,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 20:32:06,969 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:06,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:06,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1798302751, now seen corresponding path program 25 times [2021-11-25 20:32:06,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:06,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897385898] [2021-11-25 20:32:06,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:06,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:06,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:07,235 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:32:07,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:07,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897385898] [2021-11-25 20:32:07,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897385898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:07,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521125619] [2021-11-25 20:32:07,236 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:07,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:07,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:07,237 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:07,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:32:07,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:07,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:32:07,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:07,775 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:32:07,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:32:07,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521125619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:07,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593920485] [2021-11-25 20:32:07,890 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:32:07,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:07,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:07,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:07,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:07,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:07,932 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:32:07,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:32:07,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:07,968 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:32:07,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:32:07,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:07,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:32:08,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:08,033 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:08,054 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:32:08,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:32:08,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:32:08,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:08,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12074#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:32:08,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:08,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:08,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-25 20:32:08,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695275071] [2021-11-25 20:32:08,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:08,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 20:32:08,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:08,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 20:32:08,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1182, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:32:08,496 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:08,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:08,874 INFO L93 Difference]: Finished difference Result 152 states and 166 transitions. [2021-11-25 20:32:08,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:32:08,875 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 20:32:08,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:08,876 INFO L225 Difference]: With dead ends: 152 [2021-11-25 20:32:08,876 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 20:32:08,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=477, Invalid=1875, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:32:08,877 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:08,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 15 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:08,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 20:32:08,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-11-25 20:32:08,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:08,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2021-11-25 20:32:08,892 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 55 [2021-11-25 20:32:08,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:08,893 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2021-11-25 20:32:08,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:08,893 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2021-11-25 20:32:08,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 20:32:08,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:08,894 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:08,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:09,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:09,094 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:09,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:09,095 INFO L85 PathProgramCache]: Analyzing trace with hash -562818900, now seen corresponding path program 26 times [2021-11-25 20:32:09,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:09,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908313007] [2021-11-25 20:32:09,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:09,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:09,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:09,386 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 20:32:09,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:09,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908313007] [2021-11-25 20:32:09,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908313007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:09,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027701890] [2021-11-25 20:32:09,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:09,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:09,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:09,389 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:09,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:32:09,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:32:09,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:09,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:32:09,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:09,949 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 20:32:09,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:10,056 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 20:32:10,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027701890] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:10,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1057361575] [2021-11-25 20:32:10,058 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:32:10,058 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:10,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:10,059 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:10,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:10,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:10,098 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:32:10,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:32:10,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:10,125 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:32:10,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:32:10,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:10,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:32:10,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:10,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:10,210 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:32:10,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:32:10,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:32:10,381 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:10,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12920#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:32:10,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:10,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:10,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-25 20:32:10,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41623291] [2021-11-25 20:32:10,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:10,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:32:10,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:10,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:32:10,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:32:10,583 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:11,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:11,028 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2021-11-25 20:32:11,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:32:11,029 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 20:32:11,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:11,029 INFO L225 Difference]: With dead ends: 105 [2021-11-25 20:32:11,030 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 20:32:11,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1147 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:32:11,030 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:11,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 19 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:32:11,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 20:32:11,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 20:32:11,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:11,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-11-25 20:32:11,046 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2021-11-25 20:32:11,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:11,046 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-11-25 20:32:11,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:11,047 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-11-25 20:32:11,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:32:11,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:11,047 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:11,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:11,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:32:11,270 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:11,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:11,270 INFO L85 PathProgramCache]: Analyzing trace with hash -448027930, now seen corresponding path program 27 times [2021-11-25 20:32:11,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:11,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94026521] [2021-11-25 20:32:11,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:11,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:11,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:16,508 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 7 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:16,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:16,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94026521] [2021-11-25 20:32:16,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94026521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:16,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566295045] [2021-11-25 20:32:16,508 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:16,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:16,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:16,510 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:16,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:32:16,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:16,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:16,680 WARN L261 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 167 conjunts are in the unsatisfiable core [2021-11-25 20:32:16,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:21,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:21,477 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:21,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2021-11-25 20:32:21,648 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:32:21,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:36,087 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-25 20:32:36,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 1116 [2021-11-25 20:33:11,171 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-25 20:33:11,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 65 [2021-11-25 20:33:11,367 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:33:11,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566295045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:11,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [326269397] [2021-11-25 20:33:11,368 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:33:11,368 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:11,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:11,369 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:11,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:11,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,408 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:11,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:11,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:33:11,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:11,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,496 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:11,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:33:11,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:11,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:12,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13741#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:12,666 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:12,666 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:12,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 46, 46] total 127 [2021-11-25 20:33:12,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493560712] [2021-11-25 20:33:12,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:12,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-25 20:33:12,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:12,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-25 20:33:12,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=16784, Unknown=0, NotChecked=0, Total=17292 [2021-11-25 20:33:12,669 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 127 states, 127 states have (on average 1.094488188976378) internal successors, (139), 127 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:26,200 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2021-11-25 20:33:26,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-25 20:33:26,201 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.094488188976378) internal successors, (139), 127 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-25 20:33:26,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:26,202 INFO L225 Difference]: With dead ends: 97 [2021-11-25 20:33:26,202 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 20:33:26,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 86 SyntacticMatches, 17 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7869 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=1089, Invalid=27981, Unknown=0, NotChecked=0, Total=29070 [2021-11-25 20:33:26,204 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 4432 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 4540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 4432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:26,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 149 Invalid, 4540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 4432 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-25 20:33:26,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 20:33:26,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2021-11-25 20:33:26,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2021-11-25 20:33:26,228 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2021-11-25 20:33:26,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:26,228 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2021-11-25 20:33:26,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.094488188976378) internal successors, (139), 127 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,229 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2021-11-25 20:33:26,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:33:26,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:26,229 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:26,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:26,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:33:26,430 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:26,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:26,430 INFO L85 PathProgramCache]: Analyzing trace with hash -334708480, now seen corresponding path program 28 times [2021-11-25 20:33:26,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:26,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579558322] [2021-11-25 20:33:26,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:26,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:26,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:26,711 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 20:33:26,711 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:26,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579558322] [2021-11-25 20:33:26,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579558322] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:26,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252895610] [2021-11-25 20:33:26,711 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:33:26,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:26,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:26,713 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:26,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 20:33:26,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:26,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:33:26,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:27,185 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 20:33:27,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:27,300 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 20:33:27,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252895610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:27,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1237957330] [2021-11-25 20:33:27,302 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:33:27,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:27,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:27,303 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:27,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:27,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,360 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:33:27,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:33:27,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,394 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:27,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:27,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:27,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,470 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:27,488 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:27,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:33:27,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:27,669 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:27,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14564#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:27,922 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:27,922 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:27,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-25 20:33:27,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289652317] [2021-11-25 20:33:27,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:27,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 20:33:27,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:27,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 20:33:27,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:33:27,923 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:28,295 INFO L93 Difference]: Finished difference Result 166 states and 180 transitions. [2021-11-25 20:33:28,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:33:28,295 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 20:33:28,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:28,296 INFO L225 Difference]: With dead ends: 166 [2021-11-25 20:33:28,296 INFO L226 Difference]: Without dead ends: 85 [2021-11-25 20:33:28,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 668 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=561, Invalid=2195, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:33:28,298 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:28,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:33:28,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-25 20:33:28,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-11-25 20:33:28,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-11-25 20:33:28,319 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 60 [2021-11-25 20:33:28,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:28,319 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-11-25 20:33:28,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,320 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-11-25 20:33:28,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 20:33:28,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:28,320 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:28,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:28,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:28,521 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:28,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:28,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1880225003, now seen corresponding path program 29 times [2021-11-25 20:33:28,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:28,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486370767] [2021-11-25 20:33:28,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:28,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:28,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:28,863 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 20:33:28,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:28,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486370767] [2021-11-25 20:33:28,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486370767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:28,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431693757] [2021-11-25 20:33:28,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:28,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:28,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:28,870 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:28,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:33:29,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:33:29,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:29,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:33:29,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:29,865 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 20:33:29,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:30,050 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 20:33:30,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431693757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:30,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [454557815] [2021-11-25 20:33:30,052 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:33:30,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:30,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:30,053 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:30,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:30,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,106 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:30,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:30,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:33:30,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:30,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,207 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:30,231 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:30,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:33:30,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:30,401 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:30,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15488#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:30,657 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:30,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:30,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2021-11-25 20:33:30,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103636397] [2021-11-25 20:33:30,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:30,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 20:33:30,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:30,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 20:33:30,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2331, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:33:30,659 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:31,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:31,160 INFO L93 Difference]: Finished difference Result 114 states and 126 transitions. [2021-11-25 20:33:31,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:33:31,160 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 20:33:31,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:31,161 INFO L225 Difference]: With dead ends: 114 [2021-11-25 20:33:31,161 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 20:33:31,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=817, Invalid=3473, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:33:31,163 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 296 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 296 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:31,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [296 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:33:31,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 20:33:31,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-25 20:33:31,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:31,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2021-11-25 20:33:31,178 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2021-11-25 20:33:31,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:31,178 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2021-11-25 20:33:31,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:31,178 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2021-11-25 20:33:31,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 20:33:31,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:31,179 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:31,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:31,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-25 20:33:31,390 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:31,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:31,390 INFO L85 PathProgramCache]: Analyzing trace with hash -969761187, now seen corresponding path program 30 times [2021-11-25 20:33:31,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:31,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350124752] [2021-11-25 20:33:31,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:31,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:39,706 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 21 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:39,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:39,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350124752] [2021-11-25 20:33:39,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350124752] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:39,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210946550] [2021-11-25 20:33:39,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:33:39,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:39,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:39,710 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:39,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 20:33:39,874 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:33:39,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:39,879 WARN L261 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 183 conjunts are in the unsatisfiable core [2021-11-25 20:33:39,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:46,656 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 20:33:46,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:34:07,457 WARN L227 SmtUtils]: Spent 6.62s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 20:34:07,459 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-25 20:34:07,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 1348 [2021-11-25 20:35:10,845 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-25 20:35:10,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 71 [2021-11-25 20:35:11,074 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 20:35:11,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210946550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:35:11,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372311613] [2021-11-25 20:35:11,077 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:35:11,077 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:11,078 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:11,078 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:11,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:11,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:11,122 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:35:11,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:35:11,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:11,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:35:11,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:11,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:35:11,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:11,202 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:35:11,224 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:35:11,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:35:11,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:35:11,441 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:12,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16379#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:12,715 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:12,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:35:12,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 50, 50] total 137 [2021-11-25 20:35:12,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700997967] [2021-11-25 20:35:12,715 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:12,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-25 20:35:12,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:12,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-25 20:35:12,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=19499, Unknown=0, NotChecked=0, Total=20022 [2021-11-25 20:35:12,718 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 137 states, 137 states have (on average 1.0875912408759123) internal successors, (149), 137 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 20:35:32,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:32,100 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-11-25 20:35:32,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-25 20:35:32,101 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.0875912408759123) internal successors, (149), 137 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) Word has length 64 [2021-11-25 20:35:32,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:32,102 INFO L225 Difference]: With dead ends: 105 [2021-11-25 20:35:32,102 INFO L226 Difference]: Without dead ends: 102 [2021-11-25 20:35:32,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 94 SyntacticMatches, 19 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7954 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=1209, Invalid=32831, Unknown=0, NotChecked=0, Total=34040 [2021-11-25 20:35:32,106 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 5599 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 5703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 5599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:32,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 175 Invalid, 5703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 5599 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2021-11-25 20:35:32,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-25 20:35:32,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-11-25 20:35:32,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:32,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-11-25 20:35:32,140 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2021-11-25 20:35:32,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:32,141 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-11-25 20:35:32,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.0875912408759123) internal successors, (149), 137 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 20:35:32,141 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-11-25 20:35:32,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 20:35:32,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:32,142 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:32,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:32,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:32,366 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:32,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:32,366 INFO L85 PathProgramCache]: Analyzing trace with hash 634082625, now seen corresponding path program 31 times [2021-11-25 20:35:32,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:32,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208701052] [2021-11-25 20:35:32,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:32,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:32,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:32,762 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 20:35:32,762 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:32,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208701052] [2021-11-25 20:35:32,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208701052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:32,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122762697] [2021-11-25 20:35:32,763 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:35:32,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:32,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:32,765 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:32,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 20:35:32,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:32,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:35:32,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:33,432 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 20:35:33,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:33,583 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 20:35:33,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122762697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:35:33,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [600853861] [2021-11-25 20:35:33,585 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:35:33,585 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:33,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:33,586 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:33,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:33,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,632 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:35:33,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:35:33,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,676 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:35:33,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:35:33,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:35:33,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:33,776 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:35:33,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:35:33,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:35:33,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:34,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17273#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:34,186 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:34,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:35:34,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2021-11-25 20:35:34,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630450508] [2021-11-25 20:35:34,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:34,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:35:34,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:34,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:35:34,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1576, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:35:34,187 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:34,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:34,638 INFO L93 Difference]: Finished difference Result 180 states and 194 transitions. [2021-11-25 20:35:34,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:35:34,638 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-25 20:35:34,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:34,639 INFO L225 Difference]: With dead ends: 180 [2021-11-25 20:35:34,639 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 20:35:34,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 771 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=652, Invalid=2540, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:35:34,640 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:34,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:35:34,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 20:35:34,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-25 20:35:34,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.0879120879120878) internal successors, (99), 91 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:34,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2021-11-25 20:35:34,662 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 65 [2021-11-25 20:35:34,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:34,662 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2021-11-25 20:35:34,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:34,663 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2021-11-25 20:35:34,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 20:35:34,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:34,664 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:34,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:34,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 20:35:34,874 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:34,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:34,874 INFO L85 PathProgramCache]: Analyzing trace with hash 821956684, now seen corresponding path program 32 times [2021-11-25 20:35:34,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:34,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530305706] [2021-11-25 20:35:34,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:34,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:35,275 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 20:35:35,275 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:35,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530305706] [2021-11-25 20:35:35,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530305706] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:35,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131342349] [2021-11-25 20:35:35,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:35:35,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:35,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:35,277 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:35,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:35:35,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:35:35,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:35,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:35:35,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:36,381 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 20:35:36,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:36,533 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 20:35:36,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131342349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:35:36,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142891509] [2021-11-25 20:35:36,535 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:35:36,535 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:36,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:36,536 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:36,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:36,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,579 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:35:36,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:35:36,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,613 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:35:36,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:35:36,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:35:36,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:36,698 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:35:36,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:35:36,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:35:36,836 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:37,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18275#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:37,096 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:37,096 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:35:37,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2021-11-25 20:35:37,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187699008] [2021-11-25 20:35:37,097 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:37,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 20:35:37,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:37,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 20:35:37,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=2701, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:35:37,099 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:37,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:37,815 INFO L93 Difference]: Finished difference Result 123 states and 135 transitions. [2021-11-25 20:35:37,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:35:37,815 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-25 20:35:37,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:37,816 INFO L225 Difference]: With dead ends: 123 [2021-11-25 20:35:37,816 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 20:35:37,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 166 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1584 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=948, Invalid=4022, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 20:35:37,817 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 431 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 431 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:37,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 19 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [431 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:35:37,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 20:35:37,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-25 20:35:37,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:37,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-11-25 20:35:37,834 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2021-11-25 20:35:37,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:37,834 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-11-25 20:35:37,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:37,834 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-11-25 20:35:37,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 20:35:37,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:37,835 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:37,863 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-25 20:35:38,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:38,036 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:38,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:38,036 INFO L85 PathProgramCache]: Analyzing trace with hash -583338298, now seen corresponding path program 33 times [2021-11-25 20:35:38,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:38,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064515840] [2021-11-25 20:35:38,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:38,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:38,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:46,419 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 13 proven. 377 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:35:46,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:46,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064515840] [2021-11-25 20:35:46,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064515840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:46,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087675] [2021-11-25 20:35:46,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:35:46,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:46,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:46,422 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:46,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 20:35:46,629 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:35:46,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:46,634 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-25 20:35:46,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:55,193 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:35:55,195 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:35:55,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2021-11-25 20:35:55,450 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 20:35:55,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:23,804 WARN L227 SmtUtils]: Spent 9.85s on a formula simplification. DAG size of input: 1166 DAG size of output: 638 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 20:36:23,812 INFO L354 Elim1Store]: treesize reduction 2499, result has 38.6 percent of original size [2021-11-25 20:36:23,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 206 treesize of output 1602 [2021-11-25 20:37:47,472 INFO L354 Elim1Store]: treesize reduction 4023, result has 1.2 percent of original size [2021-11-25 20:37:47,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 77 [2021-11-25 20:37:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 20:37:47,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:47,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [480682447] [2021-11-25 20:37:47,743 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:37:47,743 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:47,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:47,744 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:47,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:47,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,793 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:47,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:47,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,828 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:47,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:47,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:37:47,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,915 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:37:47,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:37:47,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:37:48,069 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:49,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19240#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:49,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:49,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:49,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 54, 54] total 151 [2021-11-25 20:37:49,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682836840] [2021-11-25 20:37:49,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:49,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2021-11-25 20:37:49,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:49,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2021-11-25 20:37:49,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=23602, Unknown=0, NotChecked=0, Total=24180 [2021-11-25 20:37:49,380 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 151 states, 151 states have (on average 1.0794701986754967) internal successors, (163), 151 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 20:38:11,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:11,196 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-11-25 20:38:11,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 20:38:11,197 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.0794701986754967) internal successors, (163), 151 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 69 [2021-11-25 20:38:11,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:11,198 INFO L225 Difference]: With dead ends: 113 [2021-11-25 20:38:11,198 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 20:38:11,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 101 SyntacticMatches, 18 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9445 ImplicationChecksByTransitivity, 46.2s TimeCoverageRelationStatistics Valid=1380, Invalid=39626, Unknown=0, NotChecked=0, Total=41006 [2021-11-25 20:38:11,200 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 6296 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 6466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 6296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:11,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 179 Invalid, 6466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 6296 Invalid, 0 Unknown, 0 Unchecked, 7.9s Time] [2021-11-25 20:38:11,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 20:38:11,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-25 20:38:11,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:11,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2021-11-25 20:38:11,225 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2021-11-25 20:38:11,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:11,226 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2021-11-25 20:38:11,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.0794701986754967) internal successors, (163), 151 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 20:38:11,226 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2021-11-25 20:38:11,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 20:38:11,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:11,227 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:11,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:11,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:11,427 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:11,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:11,428 INFO L85 PathProgramCache]: Analyzing trace with hash 192508960, now seen corresponding path program 34 times [2021-11-25 20:38:11,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:11,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635391656] [2021-11-25 20:38:11,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:11,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:11,856 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 20:38:11,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:11,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635391656] [2021-11-25 20:38:11,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635391656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:11,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919945776] [2021-11-25 20:38:11,857 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:11,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:11,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:11,858 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:11,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 20:38:12,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:12,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:38:12,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:12,593 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 20:38:12,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:12,744 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 20:38:12,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919945776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:12,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512724777] [2021-11-25 20:38:12,746 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:38:12,746 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:12,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:12,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:12,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:12,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,786 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:12,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:12,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:12,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:12,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,894 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:38:12,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:38:12,927 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 16 treesize of output 12 [2021-11-25 20:38:13,013 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:13,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20205#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:13,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:13,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:13,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 20:38:13,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324570253] [2021-11-25 20:38:13,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:13,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 20:38:13,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:13,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 20:38:13,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1794, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:38:13,298 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:13,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:13,837 INFO L93 Difference]: Finished difference Result 194 states and 208 transitions. [2021-11-25 20:38:13,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 20:38:13,838 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 20:38:13,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:13,839 INFO L225 Difference]: With dead ends: 194 [2021-11-25 20:38:13,839 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 20:38:13,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=750, Invalid=2910, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:38:13,841 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:13,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 17 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:38:13,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 20:38:13,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-25 20:38:13,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:13,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2021-11-25 20:38:13,874 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 70 [2021-11-25 20:38:13,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:13,874 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2021-11-25 20:38:13,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:13,874 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2021-11-25 20:38:13,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 20:38:13,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:13,875 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:13,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:14,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 20:38:14,075 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:14,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:14,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1552476149, now seen corresponding path program 35 times [2021-11-25 20:38:14,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:14,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284542216] [2021-11-25 20:38:14,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:14,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:14,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:14,522 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 20:38:14,522 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:14,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284542216] [2021-11-25 20:38:14,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284542216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:14,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470086378] [2021-11-25 20:38:14,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:14,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:14,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:14,524 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:14,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 20:38:15,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 20:38:15,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:15,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:38:15,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:15,770 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 20:38:15,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:15,973 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 20:38:15,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470086378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:15,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1827750538] [2021-11-25 20:38:15,974 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:38:15,975 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:15,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:15,975 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:15,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:15,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,027 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:16,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:16,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,072 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:16,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:16,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:16,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:16,184 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:38:16,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:38:16,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:38:16,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:16,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21285#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:16,587 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:16,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:16,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2021-11-25 20:38:16,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852000279] [2021-11-25 20:38:16,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:16,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 20:38:16,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:16,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 20:38:16,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=562, Invalid=3098, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:38:16,590 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:17,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:17,206 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2021-11-25 20:38:17,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 20:38:17,207 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-25 20:38:17,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:17,207 INFO L225 Difference]: With dead ends: 132 [2021-11-25 20:38:17,207 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 20:38:17,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 179 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1828 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1089, Invalid=4611, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:38:17,209 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 426 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 426 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:17,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 9 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [426 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:38:17,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 20:38:17,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-25 20:38:17,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:17,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-11-25 20:38:17,231 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2021-11-25 20:38:17,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:17,231 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-11-25 20:38:17,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:17,231 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-11-25 20:38:17,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 20:38:17,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:17,232 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:17,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:17,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 20:38:17,434 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:17,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:17,434 INFO L85 PathProgramCache]: Analyzing trace with hash 966360317, now seen corresponding path program 36 times [2021-11-25 20:38:17,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:17,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768110818] [2021-11-25 20:38:17,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:17,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:17,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:26,612 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:38:26,612 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:26,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768110818] [2021-11-25 20:38:26,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768110818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:26,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467275656] [2021-11-25 20:38:26,613 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:26,613 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:26,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:26,615 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:26,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f698deb-7b98-47a9-a997-a900413d295c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 20:38:26,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:26,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:26,794 WARN L261 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 215 conjunts are in the unsatisfiable core [2021-11-25 20:38:26,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:35,819 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-25 20:38:35,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:08,783 WARN L227 SmtUtils]: Spent 12.47s on a formula simplification. DAG size of input: 1367 DAG size of output: 743 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 20:39:08,785 INFO L354 Elim1Store]: treesize reduction 2954, result has 38.5 percent of original size [2021-11-25 20:39:08,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 223 treesize of output 1878