./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-manipulation/dancing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/heap-manipulation/dancing.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P --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 c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:32:40,239 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:32:40,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:32:40,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:32:40,274 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:32:40,276 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:32:40,277 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:32:40,280 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:32:40,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:32:40,283 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:32:40,284 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:32:40,286 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:32:40,286 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:32:40,288 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:32:40,289 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:32:40,291 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:32:40,292 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:32:40,293 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:32:40,295 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:32:40,297 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:32:40,299 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:32:40,301 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:32:40,302 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:32:40,303 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:32:40,307 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:32:40,307 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:32:40,308 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:32:40,309 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:32:40,310 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:32:40,311 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:32:40,311 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:32:40,312 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:32:40,313 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:32:40,314 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:32:40,316 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:32:40,316 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:32:40,317 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:32:40,318 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:32:40,318 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:32:40,319 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:32:40,320 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:32:40,325 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:32:40,353 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:32:40,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:32:40,353 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:32:40,354 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:32:40,354 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:32:40,355 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:32:40,355 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:32:40,355 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:32:40,355 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:32:40,356 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:32:40,356 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:32:40,356 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:32:40,356 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:32:40,357 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:32:40,357 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:32:40,357 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:32:40,357 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:32:40,358 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:32:40,358 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:32:40,359 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:32:40,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:32:40,359 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:32:40,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:32:40,359 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:32:40,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:32:40,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:32:40,360 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:32:40,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:32:40,360 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:32:40,361 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:32:40,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:32:40,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:32:40,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:40,362 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:32:40,362 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:32:40,362 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:32:40,362 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:32:40,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:32:40,363 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:32:40,363 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:32:40,363 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:32:40,363 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_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2021-11-20 23:32:40,664 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:32:40,684 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:32:40,687 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:32:40,688 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:32:40,689 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:32:40,691 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/heap-manipulation/dancing.i [2021-11-20 23:32:40,754 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/data/509846a87/493f45e749344d3fafcb950e312238d8/FLAGa156e78e1 [2021-11-20 23:32:41,272 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:32:41,273 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/sv-benchmarks/c/heap-manipulation/dancing.i [2021-11-20 23:32:41,297 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/data/509846a87/493f45e749344d3fafcb950e312238d8/FLAGa156e78e1 [2021-11-20 23:32:41,573 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/data/509846a87/493f45e749344d3fafcb950e312238d8 [2021-11-20 23:32:41,576 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:32:41,577 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:32:41,580 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:41,580 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:32:41,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:32:41,588 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:41" (1/1) ... [2021-11-20 23:32:41,589 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2eab66c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:41, skipping insertion in model container [2021-11-20 23:32:41,590 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:41" (1/1) ... [2021-11-20 23:32:41,599 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:32:41,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:32:41,858 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_346a5bd1-63a1-4796-8426-6959d053e070/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2021-11-20 23:32:42,019 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:42,029 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:32:42,042 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_346a5bd1-63a1-4796-8426-6959d053e070/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2021-11-20 23:32:42,071 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:42,101 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:32:42,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42 WrapperNode [2021-11-20 23:32:42,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:42,103 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:42,104 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:32:42,104 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:32:42,112 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,150 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,185 INFO L137 Inliner]: procedures = 124, calls = 40, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 90 [2021-11-20 23:32:42,187 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:42,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:32:42,189 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:32:42,190 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:32:42,199 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,199 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,214 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,214 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,231 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,241 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,245 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,257 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:32:42,258 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:32:42,258 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:32:42,258 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:32:42,259 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (1/1) ... [2021-11-20 23:32:42,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:42,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:42,302 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:32:42,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:32:42,352 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2021-11-20 23:32:42,352 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2021-11-20 23:32:42,352 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 23:32:42,352 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 23:32:42,353 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-20 23:32:42,353 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:32:42,353 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:32:42,354 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-20 23:32:42,354 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-20 23:32:42,354 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:32:42,354 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:32:42,354 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:32:42,354 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:32:42,526 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:32:42,528 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:32:42,733 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:32:42,822 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:32:42,823 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 23:32:42,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:42 BoogieIcfgContainer [2021-11-20 23:32:42,825 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:32:42,827 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:32:42,827 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:32:42,834 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:32:42,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:32:41" (1/3) ... [2021-11-20 23:32:42,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25cda87c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:42, skipping insertion in model container [2021-11-20 23:32:42,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:42" (2/3) ... [2021-11-20 23:32:42,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25cda87c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:42, skipping insertion in model container [2021-11-20 23:32:42,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:42" (3/3) ... [2021-11-20 23:32:42,839 INFO L111 eAbstractionObserver]: Analyzing ICFG dancing.i [2021-11-20 23:32:42,848 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:32:42,849 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:32:42,897 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:32:42,904 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 [2021-11-20 23:32:42,905 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:32:42,921 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:32:42,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:32:42,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:42,928 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:42,928 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:42,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:42,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1960236528, now seen corresponding path program 1 times [2021-11-20 23:32:42,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:42,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267095370] [2021-11-20 23:32:42,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:42,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:43,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:43,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:43,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:43,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267095370] [2021-11-20 23:32:43,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267095370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:43,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:43,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:32:43,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645698939] [2021-11-20 23:32:43,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:43,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:32:43,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:43,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:32:43,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:32:43,257 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 23:32:43,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:43,453 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2021-11-20 23:32:43,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:32:43,455 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-20 23:32:43,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:43,465 INFO L225 Difference]: With dead ends: 51 [2021-11-20 23:32:43,465 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:32:43,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:32:43,475 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:43,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 119 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:32:43,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:32:43,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-11-20 23:32:43,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 21 states have internal predecessors, (25), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:32:43,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-11-20 23:32:43,516 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 13 [2021-11-20 23:32:43,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:43,518 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-11-20 23:32:43,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 23:32:43,519 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-11-20 23:32:43,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:32:43,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:43,521 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:43,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:32:43,522 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:43,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:43,523 INFO L85 PathProgramCache]: Analyzing trace with hash -990337553, now seen corresponding path program 1 times [2021-11-20 23:32:43,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:43,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235601303] [2021-11-20 23:32:43,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:43,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:43,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:43,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:32:43,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:43,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235601303] [2021-11-20 23:32:43,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235601303] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:43,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:43,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:32:43,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278915785] [2021-11-20 23:32:43,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:43,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:32:43,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:43,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:32:43,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:32:43,608 INFO L87 Difference]: Start difference. First operand 30 states and 38 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), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:43,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:43,705 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2021-11-20 23:32:43,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:32:43,706 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), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-20 23:32:43,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:43,707 INFO L225 Difference]: With dead ends: 59 [2021-11-20 23:32:43,708 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 23:32:43,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:32:43,710 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 5 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:43,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 87 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:32:43,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 23:32:43,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2021-11-20 23:32:43,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 25 states have internal predecessors, (31), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 23:32:43,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 46 transitions. [2021-11-20 23:32:43,721 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 46 transitions. Word has length 19 [2021-11-20 23:32:43,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:43,722 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 46 transitions. [2021-11-20 23:32:43,722 INFO L471 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), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:43,722 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 46 transitions. [2021-11-20 23:32:43,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:32:43,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:43,724 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:43,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:32:43,725 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:43,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:43,725 INFO L85 PathProgramCache]: Analyzing trace with hash 1915617284, now seen corresponding path program 1 times [2021-11-20 23:32:43,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:43,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916416726] [2021-11-20 23:32:43,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:43,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:43,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:43,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:32:43,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:43,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916416726] [2021-11-20 23:32:43,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916416726] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:32:43,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130686821] [2021-11-20 23:32:43,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:43,894 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:32:43,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:43,912 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:32:43,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:32:43,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:43,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:32:44,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:32:44,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:32:44,323 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:32:44,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130686821] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:44,323 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:32:44,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 13 [2021-11-20 23:32:44,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810871138] [2021-11-20 23:32:44,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:44,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:32:44,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:44,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:32:44,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:32:44,326 INFO L87 Difference]: Start difference. First operand 35 states and 46 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:44,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:44,730 INFO L93 Difference]: Finished difference Result 78 states and 107 transitions. [2021-11-20 23:32:44,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:32:44,730 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-11-20 23:32:44,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:44,739 INFO L225 Difference]: With dead ends: 78 [2021-11-20 23:32:44,739 INFO L226 Difference]: Without dead ends: 59 [2021-11-20 23:32:44,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:32:44,745 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 42 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:44,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 138 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:32:44,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-20 23:32:44,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2021-11-20 23:32:44,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 33 states have internal predecessors, (40), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (16), 9 states have call predecessors, (16), 11 states have call successors, (16) [2021-11-20 23:32:44,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 68 transitions. [2021-11-20 23:32:44,766 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 68 transitions. Word has length 21 [2021-11-20 23:32:44,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:44,766 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 68 transitions. [2021-11-20 23:32:44,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:44,767 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 68 transitions. [2021-11-20 23:32:44,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-20 23:32:44,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:44,769 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:44,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:32:44,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:32:44,990 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:44,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:44,991 INFO L85 PathProgramCache]: Analyzing trace with hash -550540788, now seen corresponding path program 1 times [2021-11-20 23:32:44,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:44,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336354489] [2021-11-20 23:32:44,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:44,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:45,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:45,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:32:45,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:45,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336354489] [2021-11-20 23:32:45,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336354489] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:45,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:45,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:32:45,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43242184] [2021-11-20 23:32:45,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:45,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:32:45,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:45,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:32:45,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:32:45,116 INFO L87 Difference]: Start difference. First operand 47 states and 68 transitions. Second operand has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:45,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:45,283 INFO L93 Difference]: Finished difference Result 75 states and 105 transitions. [2021-11-20 23:32:45,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:32:45,283 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-11-20 23:32:45,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:45,285 INFO L225 Difference]: With dead ends: 75 [2021-11-20 23:32:45,285 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:32:45,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:32:45,287 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 11 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:45,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 92 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:32:45,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:32:45,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-11-20 23:32:45,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 35 states have internal predecessors, (41), 12 states have call successors, (12), 4 states have call predecessors, (12), 5 states have return successors, (17), 9 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-20 23:32:45,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2021-11-20 23:32:45,316 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 22 [2021-11-20 23:32:45,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:45,317 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2021-11-20 23:32:45,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:45,317 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2021-11-20 23:32:45,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:32:45,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:45,320 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:45,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:32:45,321 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:45,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:45,323 INFO L85 PathProgramCache]: Analyzing trace with hash 622387022, now seen corresponding path program 1 times [2021-11-20 23:32:45,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:45,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609126804] [2021-11-20 23:32:45,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:45,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:45,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:45,470 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:32:45,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:45,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609126804] [2021-11-20 23:32:45,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609126804] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:45,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:45,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:32:45,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370690856] [2021-11-20 23:32:45,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:45,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:32:45,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:45,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:32:45,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:32:45,477 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:32:45,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:45,604 INFO L93 Difference]: Finished difference Result 56 states and 76 transitions. [2021-11-20 23:32:45,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:32:45,605 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2021-11-20 23:32:45,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:45,606 INFO L225 Difference]: With dead ends: 56 [2021-11-20 23:32:45,606 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:32:45,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:32:45,608 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 5 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:45,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 134 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:32:45,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:32:45,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-11-20 23:32:45,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 34 states have internal predecessors, (40), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (14), 8 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-20 23:32:45,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2021-11-20 23:32:45,618 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 24 [2021-11-20 23:32:45,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:45,619 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2021-11-20 23:32:45,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:32:45,619 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2021-11-20 23:32:45,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:32:45,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:45,621 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:45,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:32:45,621 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:45,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:45,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1814955922, now seen corresponding path program 1 times [2021-11-20 23:32:45,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:45,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945944468] [2021-11-20 23:32:45,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:45,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:45,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:45,791 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:32:45,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:45,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945944468] [2021-11-20 23:32:45,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945944468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:32:45,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625610148] [2021-11-20 23:32:45,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:45,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:32:45,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:45,808 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:32:45,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:32:45,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:45,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:32:45,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:32:46,040 INFO L354 Elim1Store]: treesize reduction 82, result has 23.4 percent of original size [2021-11-20 23:32:46,041 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 2 case distinctions, treesize of input 44 treesize of output 38 [2021-11-20 23:32:50,471 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:50,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:32:50,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 910 treesize of output 886 [2021-11-20 23:32:50,842 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:32:50,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625610148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:32:50,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2076816282] [2021-11-20 23:32:50,861 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-20 23:32:50,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:32:50,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:32:50,870 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:32:50,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:32:50,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:50,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:50,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:50,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 28 [2021-11-20 23:32:50,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:50,966 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:32:50,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:32:50,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:50,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-20 23:32:51,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-20 23:32:51,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:32:51,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,125 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:32:51,126 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 [2021-11-20 23:32:51,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,173 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 22 treesize of output 30 [2021-11-20 23:32:51,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,329 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:51,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 39 [2021-11-20 23:32:51,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 37 [2021-11-20 23:32:51,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,507 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:51,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,511 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 56 treesize of output 39 [2021-11-20 23:32:51,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,675 INFO L354 Elim1Store]: treesize reduction 68, result has 42.4 percent of original size [2021-11-20 23:32:51,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 33 treesize of output 72 [2021-11-20 23:32:51,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:51,839 INFO L354 Elim1Store]: treesize reduction 86, result has 31.7 percent of original size [2021-11-20 23:32:51,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 43 treesize of output 73 [2021-11-20 23:32:52,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,032 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-20 23:32:52,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2021-11-20 23:32:52,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,064 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,075 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-20 23:32:52,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 26 [2021-11-20 23:32:52,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,136 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,148 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-20 23:32:52,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 21 [2021-11-20 23:32:52,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-20 23:32:52,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 9 [2021-11-20 23:32:52,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,300 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,311 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-20 23:32:52,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 21 [2021-11-20 23:32:52,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,333 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,337 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,348 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-20 23:32:52,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 26 [2021-11-20 23:32:52,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:52,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:52,400 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-20 23:32:52,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2021-11-20 23:32:52,925 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:32:52,934 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:32:52,980 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 13 for LOIs [2021-11-20 23:32:53,125 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:32:55,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2076816282] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:55,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:32:55,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 8, 8] total 27 [2021-11-20 23:32:55,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303301288] [2021-11-20 23:32:55,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:55,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:32:55,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:55,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:32:55,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=615, Unknown=2, NotChecked=0, Total=702 [2021-11-20 23:32:55,616 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:56,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:56,024 INFO L93 Difference]: Finished difference Result 108 states and 147 transitions. [2021-11-20 23:32:56,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:32:56,026 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-20 23:32:56,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:56,027 INFO L225 Difference]: With dead ends: 108 [2021-11-20 23:32:56,027 INFO L226 Difference]: Without dead ends: 67 [2021-11-20 23:32:56,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=92, Invalid=662, Unknown=2, NotChecked=0, Total=756 [2021-11-20 23:32:56,030 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 21 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:56,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 69 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:32:56,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-20 23:32:56,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 58. [2021-11-20 23:32:56,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 43 states have internal predecessors, (49), 12 states have call successors, (12), 5 states have call predecessors, (12), 8 states have return successors, (16), 9 states have call predecessors, (16), 11 states have call successors, (16) [2021-11-20 23:32:56,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 77 transitions. [2021-11-20 23:32:56,042 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 77 transitions. Word has length 23 [2021-11-20 23:32:56,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:56,043 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 77 transitions. [2021-11-20 23:32:56,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:32:56,043 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 77 transitions. [2021-11-20 23:32:56,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:32:56,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:56,045 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:56,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:32:56,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:32:56,265 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:56,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:56,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1869846354, now seen corresponding path program 1 times [2021-11-20 23:32:56,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:56,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377522776] [2021-11-20 23:32:56,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:56,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:56,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:56,364 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:32:56,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:56,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377522776] [2021-11-20 23:32:56,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377522776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:56,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:56,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:32:56,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436270376] [2021-11-20 23:32:56,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:56,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:32:56,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:56,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:32:56,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:32:56,367 INFO L87 Difference]: Start difference. First operand 58 states and 77 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:32:56,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:56,494 INFO L93 Difference]: Finished difference Result 99 states and 126 transitions. [2021-11-20 23:32:56,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:32:56,496 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-20 23:32:56,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:56,497 INFO L225 Difference]: With dead ends: 99 [2021-11-20 23:32:56,497 INFO L226 Difference]: Without dead ends: 59 [2021-11-20 23:32:56,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:32:56,499 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 10 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:56,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:32:56,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-20 23:32:56,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 55. [2021-11-20 23:32:56,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 40 states have internal predecessors, (46), 11 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (13), 9 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-20 23:32:56,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2021-11-20 23:32:56,516 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 25 [2021-11-20 23:32:56,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:56,516 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2021-11-20 23:32:56,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:32:56,517 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2021-11-20 23:32:56,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:32:56,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:56,518 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:56,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:32:56,519 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:56,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:56,519 INFO L85 PathProgramCache]: Analyzing trace with hash 163127043, now seen corresponding path program 1 times [2021-11-20 23:32:56,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:56,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126666708] [2021-11-20 23:32:56,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:56,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:56,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:56,718 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:32:56,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:56,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126666708] [2021-11-20 23:32:56,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126666708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:32:56,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081725057] [2021-11-20 23:32:56,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:56,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:32:56,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:56,724 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:32:56,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:32:56,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:56,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 23:32:56,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:32:56,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:32:56,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:32:57,225 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:32:57,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081725057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:32:57,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982955751] [2021-11-20 23:32:57,229 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-20 23:32:57,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:32:57,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:32:57,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:32:57,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:32:57,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,264 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:32:57,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:32:57,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,290 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 37 treesize of output 28 [2021-11-20 23:32:57,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:32:57,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-20 23:32:57,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-20 23:32:57,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,446 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:32:57,447 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 [2021-11-20 23:32:57,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-20 23:32:57,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,623 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:57,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 39 [2021-11-20 23:32:57,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:57,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 39 [2021-11-20 23:32:57,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,787 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 60 treesize of output 37 [2021-11-20 23:32:57,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:57,944 INFO L354 Elim1Store]: treesize reduction 122, result has 24.7 percent of original size [2021-11-20 23:32:57,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 43 treesize of output 73 [2021-11-20 23:32:58,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,060 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-20 23:32:58,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 44 [2021-11-20 23:32:58,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,157 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,172 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-20 23:32:58,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 21 [2021-11-20 23:32:58,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,212 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,214 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,223 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-20 23:32:58,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 26 [2021-11-20 23:32:58,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,253 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,267 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-20 23:32:58,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2021-11-20 23:32:58,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-20 23:32:58,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 9 [2021-11-20 23:32:58,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,449 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-20 23:32:58,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 21 [2021-11-20 23:32:58,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,465 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,477 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-20 23:32:58,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2021-11-20 23:32:58,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,508 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:58,513 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:32:58,523 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-20 23:32:58,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 26 [2021-11-20 23:32:59,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,123 INFO L354 Elim1Store]: treesize reduction 62, result has 34.7 percent of original size [2021-11-20 23:32:59,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 133 treesize of output 112 [2021-11-20 23:32:59,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,190 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-20 23:32:59,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 106 treesize of output 91 [2021-11-20 23:32:59,204 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 85 treesize of output 70 [2021-11-20 23:32:59,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 1 [2021-11-20 23:32:59,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,422 INFO L354 Elim1Store]: treesize reduction 64, result has 32.6 percent of original size [2021-11-20 23:32:59,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 89 treesize of output 86 [2021-11-20 23:32:59,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,664 INFO L354 Elim1Store]: treesize reduction 70, result has 19.5 percent of original size [2021-11-20 23:32:59,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 81 [2021-11-20 23:32:59,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,709 INFO L354 Elim1Store]: treesize reduction 54, result has 1.8 percent of original size [2021-11-20 23:32:59,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 74 treesize of output 1 [2021-11-20 23:32:59,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,851 INFO L354 Elim1Store]: treesize reduction 156, result has 22.0 percent of original size [2021-11-20 23:32:59,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 126 treesize of output 119 [2021-11-20 23:32:59,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:32:59,936 INFO L354 Elim1Store]: treesize reduction 74, result has 42.2 percent of original size [2021-11-20 23:32:59,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 6 new quantified variables, introduced 5 case distinctions, treesize of input 127 treesize of output 135 [2021-11-20 23:33:00,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,291 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:00,335 INFO L354 Elim1Store]: treesize reduction 44, result has 34.3 percent of original size [2021-11-20 23:33:00,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 99 treesize of output 82 [2021-11-20 23:33:00,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,455 INFO L354 Elim1Store]: treesize reduction 134, result has 13.0 percent of original size [2021-11-20 23:33:00,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 117 treesize of output 86 [2021-11-20 23:33:00,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,612 INFO L354 Elim1Store]: treesize reduction 78, result has 17.9 percent of original size [2021-11-20 23:33:00,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 93 treesize of output 72 [2021-11-20 23:33:00,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,700 INFO L354 Elim1Store]: treesize reduction 70, result has 19.5 percent of original size [2021-11-20 23:33:00,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 66 treesize of output 53 [2021-11-20 23:33:03,229 INFO L354 Elim1Store]: treesize reduction 43, result has 17.3 percent of original size [2021-11-20 23:33:03,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 125 treesize of output 85 [2021-11-20 23:33:03,278 INFO L354 Elim1Store]: treesize reduction 27, result has 48.1 percent of original size [2021-11-20 23:33:03,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 115 treesize of output 103 [2021-11-20 23:33:03,289 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 100 treesize of output 67 [2021-11-20 23:33:03,441 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 39 treesize of output 1 [2021-11-20 23:33:03,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:03,568 INFO L354 Elim1Store]: treesize reduction 120, result has 40.0 percent of original size [2021-11-20 23:33:03,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 152 treesize of output 173 [2021-11-20 23:33:03,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:03,685 INFO L354 Elim1Store]: treesize reduction 102, result has 53.0 percent of original size [2021-11-20 23:33:03,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 188 treesize of output 240 [2021-11-20 23:33:07,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2021-11-20 23:33:07,899 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 13 for LOIs [2021-11-20 23:33:08,092 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:09,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:09,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:09,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 7] total 12 [2021-11-20 23:33:09,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182703221] [2021-11-20 23:33:09,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:09,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:33:09,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:09,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:33:09,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:33:09,195 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:33:09,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:09,428 INFO L93 Difference]: Finished difference Result 71 states and 88 transitions. [2021-11-20 23:33:09,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:33:09,428 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2021-11-20 23:33:09,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:09,429 INFO L225 Difference]: With dead ends: 71 [2021-11-20 23:33:09,429 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:33:09,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:33:09,431 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 22 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:09,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 139 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:09,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:33:09,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2021-11-20 23:33:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 30 states have internal predecessors, (34), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-20 23:33:09,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 51 transitions. [2021-11-20 23:33:09,444 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 51 transitions. Word has length 27 [2021-11-20 23:33:09,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:09,444 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 51 transitions. [2021-11-20 23:33:09,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:33:09,445 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 51 transitions. [2021-11-20 23:33:09,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:33:09,445 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:09,446 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:33:09,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:09,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:09,669 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:09,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:09,669 INFO L85 PathProgramCache]: Analyzing trace with hash -2103162553, now seen corresponding path program 1 times [2021-11-20 23:33:09,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:09,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527013895] [2021-11-20 23:33:09,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:09,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:09,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:09,854 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:33:09,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:09,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527013895] [2021-11-20 23:33:09,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527013895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:09,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130039322] [2021-11-20 23:33:09,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:09,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:09,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:09,857 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:09,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:33:09,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:09,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:33:09,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:33:10,020 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:10,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130039322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:10,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:10,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 12 [2021-11-20 23:33:10,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672959764] [2021-11-20 23:33:10,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:10,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:33:10,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:10,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:33:10,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:33:10,022 INFO L87 Difference]: Start difference. First operand 41 states and 51 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:33:10,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:10,160 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2021-11-20 23:33:10,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:33:10,161 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2021-11-20 23:33:10,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:10,162 INFO L225 Difference]: With dead ends: 53 [2021-11-20 23:33:10,162 INFO L226 Difference]: Without dead ends: 51 [2021-11-20 23:33:10,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:33:10,163 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 6 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:10,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 154 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:10,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-20 23:33:10,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2021-11-20 23:33:10,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.25) internal successors, (35), 30 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-20 23:33:10,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2021-11-20 23:33:10,171 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 29 [2021-11-20 23:33:10,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:10,171 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2021-11-20 23:33:10,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:33:10,171 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2021-11-20 23:33:10,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:33:10,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:10,177 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:33:10,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:10,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:10,393 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:10,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:10,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1826310404, now seen corresponding path program 1 times [2021-11-20 23:33:10,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:10,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842410373] [2021-11-20 23:33:10,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:10,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:10,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:11,057 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:33:11,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:11,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842410373] [2021-11-20 23:33:11,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842410373] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:11,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942127257] [2021-11-20 23:33:11,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:11,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:11,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:11,059 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:11,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346a5bd1-63a1-4796-8426-6959d053e070/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:33:11,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:11,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-20 23:33:11,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:11,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:11,262 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-20 23:33:11,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 92 treesize of output 84 [2021-11-20 23:33:11,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:11,276 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-20 23:33:11,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 72 [2021-11-20 23:33:12,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,804 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-20 23:33:12,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 98 treesize of output 79 [2021-11-20 23:33:12,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:12,839 INFO L354 Elim1Store]: treesize reduction 89, result has 19.1 percent of original size [2021-11-20 23:33:12,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 13 case distinctions, treesize of input 102 treesize of output 82 [2021-11-20 23:33:15,284 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:33:15,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:16,100 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 46 treesize of output 1