./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/max.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/max.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur --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 97795e7b99ddd869ecccb7f865206a167342b52333873684a94abd35acf6650e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 22:17:16,170 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:17:16,172 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:17:16,192 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:17:16,192 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:17:16,194 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:17:16,195 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:17:16,196 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:17:16,198 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:17:16,199 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:17:16,200 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:17:16,201 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:17:16,202 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:17:16,203 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:17:16,204 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:17:16,205 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:17:16,206 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:17:16,207 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:17:16,209 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:17:16,211 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:17:16,212 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:17:16,213 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:17:16,215 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:17:16,216 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:17:16,219 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:17:16,220 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:17:16,220 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:17:16,221 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:17:16,221 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:17:16,223 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:17:16,223 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:17:16,224 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:17:16,225 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:17:16,225 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:17:16,227 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:17:16,227 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:17:16,228 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:17:16,228 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:17:16,228 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:17:16,229 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:17:16,230 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:17:16,231 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:17:16,255 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:17:16,255 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:17:16,255 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:17:16,256 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:17:16,256 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:17:16,257 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:17:16,257 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:17:16,257 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:17:16,257 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:17:16,257 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:17:16,258 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:17:16,258 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:17:16,258 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:17:16,258 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:17:16,258 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:17:16,259 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:17:16,259 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:17:16,259 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:17:16,260 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:17:16,260 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:17:16,260 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:17:16,261 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:17:16,261 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:17:16,261 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:17:16,261 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:17:16,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:17:16,262 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:17:16,262 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:17:16,262 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:17:16,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:17:16,262 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:17:16,263 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:17:16,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:17:16,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:17:16,263 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:17:16,264 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:17:16,264 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:17:16,264 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:17:16,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:17:16,264 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:17:16,265 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:17:16,265 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 97795e7b99ddd869ecccb7f865206a167342b52333873684a94abd35acf6650e [2022-11-25 22:17:16,546 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:17:16,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:17:16,586 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:17:16,587 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:17:16,587 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:17:16,589 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/reducercommutativity/max.i [2022-11-25 22:17:19,726 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:17:19,910 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:17:19,910 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/sv-benchmarks/c/reducercommutativity/max.i [2022-11-25 22:17:19,917 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/data/e308ead04/596f3192d557440ca23f0e725d6402e4/FLAG73f102081 [2022-11-25 22:17:19,932 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/data/e308ead04/596f3192d557440ca23f0e725d6402e4 [2022-11-25 22:17:19,934 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:17:19,936 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:17:19,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:17:19,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:17:19,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:17:19,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:17:19" (1/1) ... [2022-11-25 22:17:19,943 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7feb3da2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:19, skipping insertion in model container [2022-11-25 22:17:19,943 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:17:19" (1/1) ... [2022-11-25 22:17:19,951 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:17:19,967 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:17:20,110 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/sv-benchmarks/c/reducercommutativity/max.i[1295,1308] [2022-11-25 22:17:20,115 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:17:20,123 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:17:20,145 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/sv-benchmarks/c/reducercommutativity/max.i[1295,1308] [2022-11-25 22:17:20,146 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:17:20,158 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:17:20,159 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20 WrapperNode [2022-11-25 22:17:20,159 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:17:20,160 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:17:20,160 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:17:20,160 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:17:20,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,173 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,197 INFO L138 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 65 [2022-11-25 22:17:20,198 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:17:20,198 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:17:20,198 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:17:20,199 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:17:20,205 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,206 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,208 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,208 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,229 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,230 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,232 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:17:20,233 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:17:20,233 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:17:20,233 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:17:20,234 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (1/1) ... [2022-11-25 22:17:20,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:17:20,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:17:20,277 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:17:20,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:17:20,316 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:17:20,316 INFO L130 BoogieDeclarations]: Found specification of procedure max [2022-11-25 22:17:20,317 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2022-11-25 22:17:20,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:17:20,317 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 22:17:20,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 22:17:20,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:17:20,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:17:20,318 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 22:17:20,318 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 22:17:20,395 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:17:20,396 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:17:20,614 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:17:20,670 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:17:20,670 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-25 22:17:20,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:17:20 BoogieIcfgContainer [2022-11-25 22:17:20,673 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:17:20,676 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:17:20,676 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:17:20,680 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:17:20,680 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:17:19" (1/3) ... [2022-11-25 22:17:20,681 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72bd9b0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:17:20, skipping insertion in model container [2022-11-25 22:17:20,681 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:17:20" (2/3) ... [2022-11-25 22:17:20,682 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72bd9b0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:17:20, skipping insertion in model container [2022-11-25 22:17:20,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:17:20" (3/3) ... [2022-11-25 22:17:20,683 INFO L112 eAbstractionObserver]: Analyzing ICFG max.i [2022-11-25 22:17:20,704 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:17:20,704 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:17:20,750 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:17:20,757 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4d9450df, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:17:20,758 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:17:20,762 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-25 22:17:20,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 22:17:20,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:17:20,771 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:17:20,771 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:17:20,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:17:20,776 INFO L85 PathProgramCache]: Analyzing trace with hash 150020737, now seen corresponding path program 1 times [2022-11-25 22:17:20,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:17:20,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344231778] [2022-11-25 22:17:20,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:20,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:17:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:21,170 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 22:17:21,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:17:21,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344231778] [2022-11-25 22:17:21,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344231778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:17:21,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59941499] [2022-11-25 22:17:21,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:21,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:17:21,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:17:21,176 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:17:21,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:17:21,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:21,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:17:21,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:17:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 22:17:21,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 22:17:21,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59941499] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:17:21,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 22:17:21,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2022-11-25 22:17:21,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302184270] [2022-11-25 22:17:21,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:17:21,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 22:17:21,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:17:21,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 22:17:21,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:17:21,464 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 22:17:21,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:17:21,583 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2022-11-25 22:17:21,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:17:21,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2022-11-25 22:17:21,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:17:21,593 INFO L225 Difference]: With dead ends: 36 [2022-11-25 22:17:21,594 INFO L226 Difference]: Without dead ends: 16 [2022-11-25 22:17:21,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:17:21,605 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 23 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 [2022-11-25 22:17:21,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 23 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:17:21,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-25 22:17:21,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-25 22:17:21,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-25 22:17:21,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-25 22:17:21,654 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 20 [2022-11-25 22:17:21,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:17:21,654 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-25 22:17:21,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 22:17:21,655 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-25 22:17:21,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 22:17:21,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:17:21,656 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:17:21,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:17:21,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-25 22:17:21,863 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:17:21,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:17:21,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1246840564, now seen corresponding path program 1 times [2022-11-25 22:17:21,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:17:21,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860633155] [2022-11-25 22:17:21,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:21,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:17:21,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:22,133 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 22:17:22,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:17:22,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860633155] [2022-11-25 22:17:22,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860633155] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:17:22,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:17:22,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 22:17:22,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129778619] [2022-11-25 22:17:22,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:17:22,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 22:17:22,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:17:22,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 22:17:22,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:17:22,138 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 22:17:22,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:17:22,192 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-11-25 22:17:22,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:17:22,193 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-11-25 22:17:22,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:17:22,197 INFO L225 Difference]: With dead ends: 26 [2022-11-25 22:17:22,198 INFO L226 Difference]: Without dead ends: 17 [2022-11-25 22:17:22,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:17:22,199 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 13 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:17:22,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 18 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:17:22,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-25 22:17:22,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-25 22:17:22,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-25 22:17:22,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-11-25 22:17:22,205 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 23 [2022-11-25 22:17:22,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:17:22,208 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-11-25 22:17:22,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 22:17:22,209 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-11-25 22:17:22,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 22:17:22,210 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:17:22,210 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:17:22,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 22:17:22,210 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:17:22,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:17:22,213 INFO L85 PathProgramCache]: Analyzing trace with hash -455122768, now seen corresponding path program 1 times [2022-11-25 22:17:22,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:17:22,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143197163] [2022-11-25 22:17:22,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:22,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:17:22,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:22,418 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 22:17:22,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:17:22,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143197163] [2022-11-25 22:17:22,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143197163] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:17:22,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201918442] [2022-11-25 22:17:22,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:22,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:17:22,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:17:22,425 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:17:22,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:17:22,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:22,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 22:17:22,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:17:22,601 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 22:17:22,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:17:22,723 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 22:17:22,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201918442] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:17:22,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822227050] [2022-11-25 22:17:22,742 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-25 22:17:22,742 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:17:22,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:17:22,751 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:17:22,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:17:22,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:22,855 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-11-25 22:17:22,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-11-25 22:17:22,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:22,894 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 22:17:22,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-25 22:17:23,252 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:17:23,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,261 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:17:23,305 INFO L321 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2022-11-25 22:17:23,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 19 case distinctions, treesize of input 307 treesize of output 289 [2022-11-25 22:17:23,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2022-11-25 22:17:23,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:17:23,792 INFO L321 Elim1Store]: treesize reduction 45, result has 34.8 percent of original size [2022-11-25 22:17:23,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 83 [2022-11-25 22:17:23,857 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2022-11-25 22:17:23,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-25 22:17:24,094 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 17 for LOIs [2022-11-25 22:17:24,153 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:17:26,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '373#(and (<= ~N~0 (+ |ULTIMATE.start_main_~i~1#1| 1)) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= ~N~0 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ (* ~N~0 4) (- 4) |ULTIMATE.start_main_~#x~0#1.offset|)) |ULTIMATE.start_main_~temp~0#1|) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 1 ~N~0) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (exists ((v_max_~ret~0_BEFORE_RETURN_6 Int)) (= |ULTIMATE.start_main_~ret5~0#1| (ite (<= (mod v_max_~ret~0_BEFORE_RETURN_6 4294967296) 2147483647) (mod v_max_~ret~0_BEFORE_RETURN_6 4294967296) (+ (- 4294967296) (mod v_max_~ret~0_BEFORE_RETURN_6 4294967296))))) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:17:26,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:17:26,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:17:26,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2022-11-25 22:17:26,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834998300] [2022-11-25 22:17:26,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:17:26,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 22:17:26,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:17:26,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 22:17:26,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2022-11-25 22:17:26,021 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 22:17:26,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:17:26,087 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2022-11-25 22:17:26,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 22:17:26,088 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) Word has length 24 [2022-11-25 22:17:26,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:17:26,089 INFO L225 Difference]: With dead ends: 32 [2022-11-25 22:17:26,089 INFO L226 Difference]: Without dead ends: 18 [2022-11-25 22:17:26,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-11-25 22:17:26,094 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:17:26,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:17:26,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-25 22:17:26,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-25 22:17:26,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-25 22:17:26,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-11-25 22:17:26,104 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 24 [2022-11-25 22:17:26,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:17:26,104 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-11-25 22:17:26,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 22:17:26,105 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-11-25 22:17:26,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 22:17:26,106 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:17:26,107 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:17:26,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:17:26,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cadfde09-bdf9-4c54-a3e6-9b66a51d7f52/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:17:26,313 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:17:26,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:17:26,314 INFO L85 PathProgramCache]: Analyzing trace with hash 2007840381, now seen corresponding path program 2 times [2022-11-25 22:17:26,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:17:26,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332029025] [2022-11-25 22:17:26,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:17:26,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:17:26,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat