./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/down.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/down.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF --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 d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 02:30:59,243 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 02:30:59,247 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 02:30:59,296 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 02:30:59,297 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 02:30:59,299 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 02:30:59,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 02:30:59,304 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 02:30:59,306 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 02:30:59,307 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 02:30:59,309 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 02:30:59,310 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 02:30:59,311 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 02:30:59,313 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 02:30:59,314 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 02:30:59,316 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 02:30:59,317 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 02:30:59,318 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 02:30:59,321 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 02:30:59,324 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 02:30:59,326 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 02:30:59,328 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 02:30:59,330 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 02:30:59,331 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 02:30:59,335 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 02:30:59,336 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 02:30:59,336 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 02:30:59,337 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 02:30:59,338 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 02:30:59,339 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 02:30:59,340 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 02:30:59,341 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 02:30:59,342 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 02:30:59,343 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 02:30:59,344 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 02:30:59,345 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 02:30:59,345 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 02:30:59,346 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 02:30:59,346 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 02:30:59,347 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 02:30:59,348 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 02:30:59,350 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-13 02:30:59,373 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 02:30:59,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 02:30:59,375 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 02:30:59,375 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 02:30:59,375 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-13 02:30:59,375 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-13 02:30:59,376 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-13 02:30:59,376 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-13 02:30:59,376 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-13 02:30:59,377 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-13 02:30:59,377 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-13 02:30:59,377 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-13 02:30:59,377 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-13 02:30:59,378 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-13 02:30:59,378 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-13 02:30:59,378 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-13 02:30:59,379 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 02:30:59,379 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 02:30:59,380 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 02:30:59,380 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 02:30:59,380 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 02:30:59,380 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 02:30:59,381 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 02:30:59,381 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 02:30:59,381 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-13 02:30:59,381 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 02:30:59,382 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 02:30:59,382 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 02:30:59,382 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 02:30:59,382 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 02:30:59,383 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 02:30:59,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:30:59,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 02:30:59,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 02:30:59,384 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 02:30:59,384 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-13 02:30:59,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 02:30:59,384 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 02:30:59,384 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 02:30:59,385 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 02:30:59,385 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_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 [2021-11-13 02:30:59,650 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 02:30:59,689 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 02:30:59,692 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 02:30:59,693 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 02:30:59,694 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 02:30:59,696 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/loop-invgen/down.i [2021-11-13 02:30:59,775 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/data/1509c30f9/29bfdd2ac21e481abe4b3eb0f210f412/FLAG198bfb5b2 [2021-11-13 02:31:00,270 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 02:31:00,271 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/sv-benchmarks/c/loop-invgen/down.i [2021-11-13 02:31:00,277 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/data/1509c30f9/29bfdd2ac21e481abe4b3eb0f210f412/FLAG198bfb5b2 [2021-11-13 02:31:00,655 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/data/1509c30f9/29bfdd2ac21e481abe4b3eb0f210f412 [2021-11-13 02:31:00,660 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 02:31:00,662 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 02:31:00,668 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 02:31:00,668 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 02:31:00,672 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 02:31:00,673 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,675 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7280531d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00, skipping insertion in model container [2021-11-13 02:31:00,675 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,686 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 02:31:00,703 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 02:31:00,881 WARN L228 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_0b243053-01a2-4be3-9117-fb9edf90b7aa/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-13 02:31:00,891 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:31:00,900 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 02:31:00,913 WARN L228 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_0b243053-01a2-4be3-9117-fb9edf90b7aa/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-13 02:31:00,917 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:31:00,930 INFO L208 MainTranslator]: Completed translation [2021-11-13 02:31:00,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00 WrapperNode [2021-11-13 02:31:00,931 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 02:31:00,932 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 02:31:00,932 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 02:31:00,933 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 02:31:00,940 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,947 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,964 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 02:31:00,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 02:31:00,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 02:31:00,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 02:31:00,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,975 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,975 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,978 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,982 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,983 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:00,985 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 02:31:00,986 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 02:31:00,986 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 02:31:00,986 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 02:31:00,987 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (1/1) ... [2021-11-13 02:31:01,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:31:01,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:01,030 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 02:31:01,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 02:31:01,079 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 02:31:01,079 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 02:31:01,079 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 02:31:01,079 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 02:31:01,248 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 02:31:01,249 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-13 02:31:01,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:31:01 BoogieIcfgContainer [2021-11-13 02:31:01,251 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 02:31:01,253 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 02:31:01,253 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 02:31:01,257 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 02:31:01,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 02:31:00" (1/3) ... [2021-11-13 02:31:01,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dd79b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:31:01, skipping insertion in model container [2021-11-13 02:31:01,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:31:00" (2/3) ... [2021-11-13 02:31:01,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dd79b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:31:01, skipping insertion in model container [2021-11-13 02:31:01,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:31:01" (3/3) ... [2021-11-13 02:31:01,260 INFO L111 eAbstractionObserver]: Analyzing ICFG down.i [2021-11-13 02:31:01,265 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 02:31:01,266 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 02:31:01,312 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 02:31:01,320 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 [2021-11-13 02:31:01,320 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 02:31:01,334 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:01,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-13 02:31:01,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:01,340 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-13 02:31:01,341 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:01,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:01,347 INFO L85 PathProgramCache]: Analyzing trace with hash 69824243, now seen corresponding path program 1 times [2021-11-13 02:31:01,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:01,357 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937720372] [2021-11-13 02:31:01,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:01,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:01,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:01,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:01,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:01,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937720372] [2021-11-13 02:31:01,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937720372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:31:01,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:31:01,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 02:31:01,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386940031] [2021-11-13 02:31:01,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:31:01,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 02:31:01,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:01,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 02:31:01,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 02:31:01,560 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:01,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:01,608 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2021-11-13 02:31:01,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:31:01,610 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-13 02:31:01,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:01,618 INFO L225 Difference]: With dead ends: 17 [2021-11-13 02:31:01,618 INFO L226 Difference]: Without dead ends: 8 [2021-11-13 02:31:01,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:31:01,625 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.81ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.53ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:01,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.81ms Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 20.53ms Time] [2021-11-13 02:31:01,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-13 02:31:01,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-13 02:31:01,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:01,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-13 02:31:01,687 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-13 02:31:01,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:01,688 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-13 02:31:01,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:01,688 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-13 02:31:01,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-13 02:31:01,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:01,689 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-13 02:31:01,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 02:31:01,690 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:01,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:01,704 INFO L85 PathProgramCache]: Analyzing trace with hash 2130199594, now seen corresponding path program 1 times [2021-11-13 02:31:01,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:01,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61849067] [2021-11-13 02:31:01,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:01,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:01,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:01,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:01,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:01,800 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61849067] [2021-11-13 02:31:01,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61849067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:01,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030568338] [2021-11-13 02:31:01,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:01,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:01,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:01,804 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:01,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 02:31:01,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:01,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 02:31:01,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:01,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:01,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:01,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030568338] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 02:31:01,991 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:31:01,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 6 [2021-11-13 02:31:01,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161642399] [2021-11-13 02:31:01,992 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 02:31:01,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:31:01,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:01,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:31:01,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-13 02:31:01,995 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:02,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:02,037 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-11-13 02:31:02,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 02:31:02,038 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-13 02:31:02,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:02,039 INFO L225 Difference]: With dead ends: 18 [2021-11-13 02:31:02,039 INFO L226 Difference]: Without dead ends: 16 [2021-11-13 02:31:02,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-13 02:31:02,044 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.94ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.49ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:02,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 9 Invalid, 25 Unknown, 0 Unchecked, 0.94ms Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 23.49ms Time] [2021-11-13 02:31:02,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-13 02:31:02,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 10. [2021-11-13 02:31:02,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:02,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-13 02:31:02,051 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2021-11-13 02:31:02,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:02,052 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-13 02:31:02,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:02,052 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-13 02:31:02,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-13 02:31:02,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:02,053 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:02,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:02,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-13 02:31:02,280 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:02,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:02,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1655840561, now seen corresponding path program 1 times [2021-11-13 02:31:02,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:02,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519473415] [2021-11-13 02:31:02,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:02,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:02,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:02,402 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:02,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:02,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519473415] [2021-11-13 02:31:02,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519473415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:02,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184269548] [2021-11-13 02:31:02,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:02,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:02,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:02,410 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:02,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 02:31:02,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:02,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 02:31:02,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:02,530 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:02,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:02,597 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:02,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184269548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:02,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [721638771] [2021-11-13 02:31:02,621 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:02,621 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:02,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:02,632 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:02,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:02,667 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,672 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:02,673 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,673 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:02,678 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:02,679 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,681 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:02,686 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:02,710 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-11-13 02:31:02,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:02,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:02,738 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:02,740 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:02,741 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:02,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:02,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:02,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:02,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:02,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:02,823 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 23 treesize of output 22 [2021-11-13 02:31:02,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:02,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:02,831 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:02,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:02,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,850 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:02,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:02,861 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:02,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:02,882 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:02,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:02,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:02,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:03,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:03,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,151 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:03,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:03,169 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:03,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:03,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:03,225 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:03,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:03,240 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:03,639 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:03,639 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:03,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2021-11-13 02:31:03,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017363441] [2021-11-13 02:31:03,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:03,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 02:31:03,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:03,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 02:31:03,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-13 02:31:03,642 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:03,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:03,702 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-11-13 02:31:03,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 02:31:03,703 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-13 02:31:03,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:03,703 INFO L225 Difference]: With dead ends: 20 [2021-11-13 02:31:03,704 INFO L226 Difference]: Without dead ends: 11 [2021-11-13 02:31:03,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-13 02:31:03,712 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.26ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.20ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:03,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 16 Invalid, 25 Unknown, 0 Unchecked, 1.26ms Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 27.20ms Time] [2021-11-13 02:31:03,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-13 02:31:03,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-13 02:31:03,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:03,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-13 02:31:03,727 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2021-11-13 02:31:03,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:03,728 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-13 02:31:03,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:03,728 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-13 02:31:03,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-13 02:31:03,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:03,734 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:03,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:03,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:03,936 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:03,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:03,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1112456570, now seen corresponding path program 2 times [2021-11-13 02:31:03,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:03,937 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201353393] [2021-11-13 02:31:03,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:03,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:04,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:04,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:04,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201353393] [2021-11-13 02:31:04,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201353393] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:04,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394254350] [2021-11-13 02:31:04,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:04,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:04,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:04,014 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:04,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 02:31:04,060 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-13 02:31:04,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:04,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 02:31:04,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:04,130 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:04,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:04,194 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:04,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394254350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:04,194 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1259673528] [2021-11-13 02:31:04,202 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:04,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:04,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:04,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:04,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:04,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,215 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:04,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,216 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:04,216 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:04,217 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:04,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:04,226 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-11-13 02:31:04,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:04,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:04,244 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:04,245 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:04,246 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:04,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:04,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:04,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:04,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:04,265 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 23 treesize of output 22 [2021-11-13 02:31:04,266 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,268 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:04,269 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,270 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:04,270 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:04,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,274 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,275 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:04,280 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:04,280 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:04,284 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,290 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:04,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:04,360 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:04,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,414 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:04,418 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:04,426 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:04,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:04,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:04,466 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:04,472 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:04,482 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:04,860 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:04,860 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:04,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2021-11-13 02:31:04,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455827103] [2021-11-13 02:31:04,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:04,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 02:31:04,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:04,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 02:31:04,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-13 02:31:04,862 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:04,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:04,942 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-11-13 02:31:04,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 02:31:04,942 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-13 02:31:04,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:04,943 INFO L225 Difference]: With dead ends: 22 [2021-11-13 02:31:04,943 INFO L226 Difference]: Without dead ends: 20 [2021-11-13 02:31:04,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-13 02:31:04,944 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.00ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.13ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:04,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 14 Invalid, 54 Unknown, 0 Unchecked, 1.00ms Time], IncrementalHoareTripleChecker [11 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 38.13ms Time] [2021-11-13 02:31:04,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-13 02:31:04,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-13 02:31:04,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:04,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-13 02:31:04,949 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-11-13 02:31:04,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:04,949 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-13 02:31:04,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:04,949 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-13 02:31:04,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 02:31:04,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:04,950 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1] [2021-11-13 02:31:04,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:05,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:05,168 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:05,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:05,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1221200653, now seen corresponding path program 3 times [2021-11-13 02:31:05,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:05,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499740266] [2021-11-13 02:31:05,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:05,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:05,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:05,236 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:05,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:05,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499740266] [2021-11-13 02:31:05,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499740266] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:05,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974347755] [2021-11-13 02:31:05,236 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:05,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:05,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:05,243 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:05,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 02:31:05,307 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:05,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:05,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-13 02:31:05,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:05,354 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:05,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:05,391 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:05,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974347755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:05,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1360087978] [2021-11-13 02:31:05,393 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:05,394 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:05,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:05,394 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:05,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:05,401 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,402 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:05,404 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,406 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:05,406 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:05,407 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:05,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:05,420 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-11-13 02:31:05,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:05,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:05,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:05,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:05,432 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:05,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:05,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:05,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:05,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:05,453 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 23 treesize of output 22 [2021-11-13 02:31:05,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:05,458 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,458 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:05,458 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:05,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,462 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:05,465 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:05,466 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:05,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,473 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:05,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,512 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:05,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:05,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,567 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:05,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:05,580 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:05,584 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:05,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:05,608 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:05,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:05,618 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:05,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:05,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:05,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2021-11-13 02:31:05,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017175315] [2021-11-13 02:31:05,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:05,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 02:31:05,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:05,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 02:31:05,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-13 02:31:05,988 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:06,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:06,045 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-13 02:31:06,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 02:31:06,045 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-13 02:31:06,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:06,046 INFO L225 Difference]: With dead ends: 27 [2021-11-13 02:31:06,046 INFO L226 Difference]: Without dead ends: 15 [2021-11-13 02:31:06,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-11-13 02:31:06,047 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.55ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.31ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:06,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 17 Invalid, 32 Unknown, 0 Unchecked, 0.55ms Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 25.31ms Time] [2021-11-13 02:31:06,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-13 02:31:06,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-13 02:31:06,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:06,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-13 02:31:06,051 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2021-11-13 02:31:06,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:06,051 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-13 02:31:06,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:06,051 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-13 02:31:06,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-13 02:31:06,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:06,056 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2021-11-13 02:31:06,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:06,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:06,276 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:06,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:06,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1326687018, now seen corresponding path program 4 times [2021-11-13 02:31:06,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:06,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152574486] [2021-11-13 02:31:06,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:06,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:06,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:06,331 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:06,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:06,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152574486] [2021-11-13 02:31:06,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152574486] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:06,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322437403] [2021-11-13 02:31:06,331 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:06,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:06,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:06,333 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:06,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 02:31:06,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:06,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-13 02:31:06,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:06,422 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:06,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:06,469 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:06,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322437403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:06,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609113969] [2021-11-13 02:31:06,471 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:06,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:06,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:06,472 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:06,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:06,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,477 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:06,478 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:06,479 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:06,479 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,479 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:06,481 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:06,483 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 10=[|v_#valid_12|]} [2021-11-13 02:31:06,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:06,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:06,490 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,491 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:06,491 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:06,492 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:06,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:06,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:06,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:06,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:06,505 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 23 treesize of output 22 [2021-11-13 02:31:06,506 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,507 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:06,508 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:06,509 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:06,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,512 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:06,515 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:06,516 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:06,518 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,521 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:06,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:06,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:06,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,603 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:06,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:06,612 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:06,615 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:06,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:06,637 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:06,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:06,646 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:07,038 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:07,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:07,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-13 02:31:07,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332448551] [2021-11-13 02:31:07,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:07,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 02:31:07,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:07,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 02:31:07,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-13 02:31:07,040 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:07,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:07,147 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-13 02:31:07,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 02:31:07,148 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-13 02:31:07,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:07,149 INFO L225 Difference]: With dead ends: 26 [2021-11-13 02:31:07,149 INFO L226 Difference]: Without dead ends: 24 [2021-11-13 02:31:07,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2021-11-13 02:31:07,150 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.63ms SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 49.00ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:07,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 62 Unknown, 0 Unchecked, 1.63ms Time], IncrementalHoareTripleChecker [19 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 49.00ms Time] [2021-11-13 02:31:07,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-13 02:31:07,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2021-11-13 02:31:07,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:07,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-13 02:31:07,155 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-11-13 02:31:07,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:07,155 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-13 02:31:07,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:07,156 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-13 02:31:07,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-13 02:31:07,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:07,161 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1] [2021-11-13 02:31:07,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:07,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-13 02:31:07,362 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:07,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:07,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1048715727, now seen corresponding path program 5 times [2021-11-13 02:31:07,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:07,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331582232] [2021-11-13 02:31:07,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:07,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:07,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:07,437 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:07,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:07,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331582232] [2021-11-13 02:31:07,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331582232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:07,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163416048] [2021-11-13 02:31:07,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:07,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:07,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:07,439 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:07,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 02:31:07,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 02:31:07,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:07,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-13 02:31:07,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:07,546 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:07,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:07,596 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:07,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163416048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:07,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1152708679] [2021-11-13 02:31:07,599 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:07,599 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:07,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:07,600 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:07,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:07,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,608 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:07,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,610 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:07,611 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:07,611 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:07,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:07,616 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 10=[|v_#valid_13|]} [2021-11-13 02:31:07,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:07,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:07,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:07,625 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:07,626 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:07,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:07,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:07,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:07,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:07,640 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 23 treesize of output 22 [2021-11-13 02:31:07,641 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:07,644 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:07,644 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:07,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,648 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,649 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:07,651 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:07,651 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:07,653 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,656 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:07,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:07,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:07,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,728 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:07,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:07,736 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:07,739 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:07,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:07,768 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:07,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:07,786 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:08,161 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:08,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:08,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 10 [2021-11-13 02:31:08,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322932960] [2021-11-13 02:31:08,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:08,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 02:31:08,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:08,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 02:31:08,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-13 02:31:08,163 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:08,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:08,250 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-13 02:31:08,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 02:31:08,250 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-13 02:31:08,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:08,251 INFO L225 Difference]: With dead ends: 34 [2021-11-13 02:31:08,251 INFO L226 Difference]: Without dead ends: 19 [2021-11-13 02:31:08,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-13 02:31:08,253 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.91ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 45.24ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:08,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 32 Invalid, 59 Unknown, 0 Unchecked, 0.91ms Time], IncrementalHoareTripleChecker [5 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 45.24ms Time] [2021-11-13 02:31:08,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-13 02:31:08,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-13 02:31:08,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:08,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-13 02:31:08,257 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2021-11-13 02:31:08,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:08,257 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-13 02:31:08,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:08,257 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-13 02:31:08,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-13 02:31:08,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:08,258 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2021-11-13 02:31:08,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-13 02:31:08,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-13 02:31:08,476 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:08,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:08,477 INFO L85 PathProgramCache]: Analyzing trace with hash 920640646, now seen corresponding path program 6 times [2021-11-13 02:31:08,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:08,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263755174] [2021-11-13 02:31:08,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:08,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:08,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:08,549 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:08,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:08,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263755174] [2021-11-13 02:31:08,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263755174] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:08,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908029909] [2021-11-13 02:31:08,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:08,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:08,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:08,558 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:08,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 02:31:08,607 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:08,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:08,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 02:31:08,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:08,681 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:08,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:08,749 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:08,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908029909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:08,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1401257211] [2021-11-13 02:31:08,751 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:08,752 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:08,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:08,752 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:08,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:08,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,759 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:08,759 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:08,761 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:08,761 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,761 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:08,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:08,765 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 10=[|v_#valid_14|]} [2021-11-13 02:31:08,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:08,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:08,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:08,774 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:08,774 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:08,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,777 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:08,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:08,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:08,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:08,788 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 23 treesize of output 22 [2021-11-13 02:31:08,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:08,791 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:08,792 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:08,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,795 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,796 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:08,798 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:08,798 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:08,800 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,802 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:08,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:08,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:08,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,875 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:08,877 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:08,883 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:08,886 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:08,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:08,919 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:08,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:08,927 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:09,260 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:09,260 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:09,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-13 02:31:09,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105457343] [2021-11-13 02:31:09,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:09,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 02:31:09,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:09,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 02:31:09,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-13 02:31:09,262 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:09,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:09,365 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-13 02:31:09,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 02:31:09,366 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-13 02:31:09,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:09,366 INFO L225 Difference]: With dead ends: 30 [2021-11-13 02:31:09,367 INFO L226 Difference]: Without dead ends: 28 [2021-11-13 02:31:09,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-13 02:31:09,368 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 38.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.85ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.33ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:09,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 72 Unknown, 0 Unchecked, 0.85ms Time], IncrementalHoareTripleChecker [21 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 46.33ms Time] [2021-11-13 02:31:09,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-13 02:31:09,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-13 02:31:09,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:09,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-11-13 02:31:09,373 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2021-11-13 02:31:09,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:09,374 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-11-13 02:31:09,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:09,374 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-11-13 02:31:09,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-13 02:31:09,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:09,375 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1] [2021-11-13 02:31:09,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:09,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-11-13 02:31:09,596 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:09,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:09,597 INFO L85 PathProgramCache]: Analyzing trace with hash -850846989, now seen corresponding path program 7 times [2021-11-13 02:31:09,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:09,597 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538029367] [2021-11-13 02:31:09,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:09,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:09,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:09,686 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:09,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:09,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538029367] [2021-11-13 02:31:09,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538029367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:09,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478483199] [2021-11-13 02:31:09,687 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:09,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:09,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:09,688 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:09,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 02:31:09,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:09,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-13 02:31:09,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:09,787 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:09,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:09,842 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:09,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478483199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:09,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [950021731] [2021-11-13 02:31:09,847 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:09,847 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:09,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:09,848 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:09,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:09,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,854 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:09,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:09,858 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:09,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:09,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:09,866 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 10=[|v_#valid_15|]} [2021-11-13 02:31:09,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:09,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:09,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:09,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,874 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:09,874 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:09,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:09,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:09,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:09,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:09,886 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 23 treesize of output 22 [2021-11-13 02:31:09,887 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:09,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:09,889 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:09,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,895 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:09,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:09,897 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:09,898 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,901 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:09,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,927 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:09,931 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:09,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,967 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:09,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:09,974 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:09,976 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:09,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:09,995 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:09,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:10,003 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:10,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:10,354 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:10,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 12 [2021-11-13 02:31:10,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739856784] [2021-11-13 02:31:10,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:10,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 02:31:10,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:10,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 02:31:10,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-13 02:31:10,356 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:10,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:10,445 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-13 02:31:10,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 02:31:10,446 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-13 02:31:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:10,446 INFO L225 Difference]: With dead ends: 41 [2021-11-13 02:31:10,446 INFO L226 Difference]: Without dead ends: 23 [2021-11-13 02:31:10,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2021-11-13 02:31:10,448 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.67ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.43ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:10,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 39 Invalid, 65 Unknown, 0 Unchecked, 0.67ms Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 35.43ms Time] [2021-11-13 02:31:10,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-13 02:31:10,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-13 02:31:10,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:10,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-13 02:31:10,452 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2021-11-13 02:31:10,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:10,452 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-13 02:31:10,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:10,453 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-13 02:31:10,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-13 02:31:10,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:10,453 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2021-11-13 02:31:10,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:10,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:10,672 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:10,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:10,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1773362646, now seen corresponding path program 8 times [2021-11-13 02:31:10,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:10,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795982268] [2021-11-13 02:31:10,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:10,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:10,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:10,764 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:10,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:10,764 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795982268] [2021-11-13 02:31:10,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795982268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:10,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231569590] [2021-11-13 02:31:10,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:10,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:10,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:10,766 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:10,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 02:31:10,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 02:31:10,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:10,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-13 02:31:10,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:10,890 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:10,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:10,963 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:10,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231569590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:10,964 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369369802] [2021-11-13 02:31:10,966 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:10,966 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:10,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:10,967 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:10,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:10,972 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,973 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:10,974 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:10,975 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:10,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:10,982 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:10,984 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 10=[|v_#valid_16|]} [2021-11-13 02:31:10,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:10,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:10,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:10,992 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:10,992 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:10,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:10,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:10,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:10,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:10,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:11,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:11,005 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 23 treesize of output 22 [2021-11-13 02:31:11,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:11,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:11,008 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:11,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,011 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:11,015 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:11,015 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:11,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,019 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:11,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:11,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:11,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,086 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:11,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:11,096 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:11,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:11,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:11,120 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:11,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:11,127 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:11,459 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:11,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:11,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2021-11-13 02:31:11,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065451230] [2021-11-13 02:31:11,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:11,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 02:31:11,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:11,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 02:31:11,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-13 02:31:11,461 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:11,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:11,594 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-11-13 02:31:11,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-13 02:31:11,595 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-13 02:31:11,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:11,596 INFO L225 Difference]: With dead ends: 34 [2021-11-13 02:31:11,596 INFO L226 Difference]: Without dead ends: 32 [2021-11-13 02:31:11,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2021-11-13 02:31:11,597 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 21 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 47.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.82ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 64.45ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:11,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 13 Invalid, 85 Unknown, 0 Unchecked, 0.82ms Time], IncrementalHoareTripleChecker [25 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 64.45ms Time] [2021-11-13 02:31:11,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-13 02:31:11,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-13 02:31:11,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:11,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-13 02:31:11,602 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-11-13 02:31:11,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:11,602 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-13 02:31:11,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:11,603 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-13 02:31:11,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-13 02:31:11,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:11,603 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1] [2021-11-13 02:31:11,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:11,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2021-11-13 02:31:11,804 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:11,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:11,804 INFO L85 PathProgramCache]: Analyzing trace with hash -2144025905, now seen corresponding path program 9 times [2021-11-13 02:31:11,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:11,805 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18726008] [2021-11-13 02:31:11,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:11,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:11,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:11,905 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:11,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:11,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18726008] [2021-11-13 02:31:11,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18726008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:11,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087341140] [2021-11-13 02:31:11,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:11,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:11,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:11,907 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:11,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 02:31:11,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:11,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:11,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-13 02:31:11,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:12,039 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:12,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:12,097 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:12,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087341140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:12,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1696825194] [2021-11-13 02:31:12,100 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:12,100 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:12,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:12,100 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:12,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:12,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,104 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:12,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:12,106 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:12,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:12,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:12,110 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 10=[|v_#valid_17|]} [2021-11-13 02:31:12,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:12,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:12,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:12,117 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:12,118 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:12,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:12,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:12,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:12,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:12,131 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 23 treesize of output 22 [2021-11-13 02:31:12,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:12,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:12,134 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:12,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,137 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,138 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:12,139 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:12,139 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:12,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:12,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,170 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:12,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:12,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,206 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:12,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:12,213 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:12,215 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:12,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:12,233 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:12,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:12,239 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:12,571 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:12,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:12,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 14 [2021-11-13 02:31:12,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414365810] [2021-11-13 02:31:12,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:12,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 02:31:12,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:12,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 02:31:12,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-13 02:31:12,574 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:12,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:12,689 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-13 02:31:12,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 02:31:12,689 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-13 02:31:12,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:12,689 INFO L225 Difference]: With dead ends: 48 [2021-11-13 02:31:12,689 INFO L226 Difference]: Without dead ends: 27 [2021-11-13 02:31:12,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2021-11-13 02:31:12,691 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 3 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.64ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.95ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:12,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 45 Invalid, 82 Unknown, 0 Unchecked, 0.64ms Time], IncrementalHoareTripleChecker [4 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 48.95ms Time] [2021-11-13 02:31:12,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-13 02:31:12,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-13 02:31:12,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:12,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-13 02:31:12,696 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2021-11-13 02:31:12,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:12,696 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-13 02:31:12,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:12,696 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-13 02:31:12,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 02:31:12,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:12,697 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2021-11-13 02:31:12,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:12,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:12,908 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:12,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:12,909 INFO L85 PathProgramCache]: Analyzing trace with hash -2128357754, now seen corresponding path program 10 times [2021-11-13 02:31:12,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:12,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245609841] [2021-11-13 02:31:12,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:12,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:12,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:13,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:13,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245609841] [2021-11-13 02:31:13,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245609841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:13,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689528824] [2021-11-13 02:31:13,001 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:13,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:13,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:13,002 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:13,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 02:31:13,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:13,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-13 02:31:13,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:13,136 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:13,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:13,218 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:13,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689528824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:13,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770207145] [2021-11-13 02:31:13,221 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:13,221 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:13,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:13,221 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:13,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:13,224 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,225 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:13,226 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:13,226 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:13,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:13,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:13,230 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 10=[|v_#valid_18|]} [2021-11-13 02:31:13,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:13,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:13,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:13,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:13,238 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:13,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,241 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:13,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:13,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:13,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:13,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:31:13,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:13,253 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,253 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:13,254 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:13,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,256 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,257 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:13,259 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:13,259 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:13,261 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:13,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,287 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:13,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:13,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,320 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:13,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:13,327 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:13,329 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:13,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:13,356 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:13,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:13,363 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:13,708 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:13,708 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:13,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2021-11-13 02:31:13,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603757209] [2021-11-13 02:31:13,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:13,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 02:31:13,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:13,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 02:31:13,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-11-13 02:31:13,709 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:13,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:13,848 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2021-11-13 02:31:13,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-13 02:31:13,848 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-13 02:31:13,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:13,849 INFO L225 Difference]: With dead ends: 38 [2021-11-13 02:31:13,849 INFO L226 Difference]: Without dead ends: 36 [2021-11-13 02:31:13,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2021-11-13 02:31:13,850 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 19 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.68ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 66.51ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:13,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 12 Invalid, 101 Unknown, 0 Unchecked, 0.68ms Time], IncrementalHoareTripleChecker [23 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 66.51ms Time] [2021-11-13 02:31:13,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-13 02:31:13,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-11-13 02:31:13,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:13,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-11-13 02:31:13,856 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-11-13 02:31:13,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:13,856 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-11-13 02:31:13,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-11-13 02:31:13,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-13 02:31:13,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:13,858 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1] [2021-11-13 02:31:13,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:14,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:14,075 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:14,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:14,075 INFO L85 PathProgramCache]: Analyzing trace with hash 701161715, now seen corresponding path program 11 times [2021-11-13 02:31:14,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:14,076 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570316665] [2021-11-13 02:31:14,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:14,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:14,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:14,202 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:14,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:14,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570316665] [2021-11-13 02:31:14,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570316665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:14,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952744934] [2021-11-13 02:31:14,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:14,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:14,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:14,204 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:14,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 02:31:14,253 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-13 02:31:14,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:14,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-13 02:31:14,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:14,334 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:14,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:14,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952744934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:14,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1981856680] [2021-11-13 02:31:14,413 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:14,413 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:14,414 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:14,414 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:14,414 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:14,417 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,418 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:14,418 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:14,419 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:14,420 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:14,421 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:14,423 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 10=[|v_#valid_19|]} [2021-11-13 02:31:14,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:14,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:14,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:14,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:14,431 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:14,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:14,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:14,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:14,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:14,443 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 23 treesize of output 22 [2021-11-13 02:31:14,444 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,446 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:14,446 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:14,447 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:14,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,450 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,451 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,451 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:14,452 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:14,452 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:14,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,456 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:14,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,480 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:14,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:14,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,521 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:14,522 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:14,527 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:14,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:14,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:14,545 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:14,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:14,551 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:14,873 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:14,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:14,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 16 [2021-11-13 02:31:14,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980410944] [2021-11-13 02:31:14,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:14,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 02:31:14,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:14,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 02:31:14,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-11-13 02:31:14,874 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:14,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:14,996 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-13 02:31:14,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 02:31:14,996 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-13 02:31:14,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:14,997 INFO L225 Difference]: With dead ends: 55 [2021-11-13 02:31:14,997 INFO L226 Difference]: Without dead ends: 31 [2021-11-13 02:31:14,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=646, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:31:14,998 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.53ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 53.61ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:14,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 52 Invalid, 99 Unknown, 0 Unchecked, 0.53ms Time], IncrementalHoareTripleChecker [4 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 53.61ms Time] [2021-11-13 02:31:14,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-13 02:31:15,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-13 02:31:15,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:15,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-13 02:31:15,004 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2021-11-13 02:31:15,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:15,004 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-13 02:31:15,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:15,004 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-13 02:31:15,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 02:31:15,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:15,005 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2021-11-13 02:31:15,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:15,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:15,226 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:15,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:15,226 INFO L85 PathProgramCache]: Analyzing trace with hash 822821162, now seen corresponding path program 12 times [2021-11-13 02:31:15,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:15,226 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617800450] [2021-11-13 02:31:15,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:15,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:15,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:15,321 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:15,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:15,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617800450] [2021-11-13 02:31:15,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617800450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:15,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670491299] [2021-11-13 02:31:15,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:15,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:15,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:15,322 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:15,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 02:31:15,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:15,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:15,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-13 02:31:15,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:15,456 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:15,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:15,544 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:15,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670491299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:15,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398233092] [2021-11-13 02:31:15,546 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:15,547 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:15,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:15,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:15,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:15,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,551 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:15,551 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:15,552 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:15,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:15,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:15,555 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 10=[|v_#valid_20|]} [2021-11-13 02:31:15,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:15,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:15,562 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:15,562 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:15,563 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:15,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:15,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:15,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:15,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:15,576 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 23 treesize of output 22 [2021-11-13 02:31:15,576 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:15,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:15,579 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:15,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,582 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:15,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:15,585 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:15,586 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:15,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,614 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:15,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:15,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,656 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:15,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:15,661 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:15,663 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:15,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:15,687 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:15,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:15,694 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:15,978 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:15,978 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:15,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2021-11-13 02:31:15,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423825286] [2021-11-13 02:31:15,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:15,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 02:31:15,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:15,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 02:31:15,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2021-11-13 02:31:15,980 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:16,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:16,111 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-11-13 02:31:16,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-13 02:31:16,111 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-13 02:31:16,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:16,112 INFO L225 Difference]: With dead ends: 42 [2021-11-13 02:31:16,112 INFO L226 Difference]: Without dead ends: 40 [2021-11-13 02:31:16,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2021-11-13 02:31:16,113 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 30 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.68ms SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.78ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:16,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 14 Invalid, 117 Unknown, 0 Unchecked, 0.68ms Time], IncrementalHoareTripleChecker [32 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 61.78ms Time] [2021-11-13 02:31:16,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-13 02:31:16,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-11-13 02:31:16,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:16,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-11-13 02:31:16,119 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2021-11-13 02:31:16,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:16,119 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-11-13 02:31:16,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:16,120 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-11-13 02:31:16,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-13 02:31:16,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:16,120 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1] [2021-11-13 02:31:16,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:16,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable211 [2021-11-13 02:31:16,324 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:16,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:16,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1291699151, now seen corresponding path program 13 times [2021-11-13 02:31:16,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:16,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651096895] [2021-11-13 02:31:16,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:16,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:16,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:16,455 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:16,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:16,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651096895] [2021-11-13 02:31:16,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651096895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:16,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106003710] [2021-11-13 02:31:16,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:16,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:16,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:16,456 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:16,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 02:31:16,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:16,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-13 02:31:16,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:16,596 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:16,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:16,679 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:16,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106003710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:16,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276914037] [2021-11-13 02:31:16,682 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:16,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:16,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:16,683 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:16,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:16,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,688 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:16,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:16,689 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:16,690 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,690 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:16,691 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:16,693 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 10=[|v_#valid_21|]} [2021-11-13 02:31:16,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:16,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:16,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:16,700 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:16,700 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:16,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,703 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:16,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:16,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:16,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:16,713 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 23 treesize of output 22 [2021-11-13 02:31:16,713 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:16,715 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:16,716 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:16,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,718 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,739 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:16,740 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:16,740 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:16,742 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,744 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:16,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:16,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:16,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,818 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:16,819 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:16,825 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:16,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:16,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:16,846 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:16,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:16,855 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:17,187 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:17,187 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:17,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 18 [2021-11-13 02:31:17,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788139883] [2021-11-13 02:31:17,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:17,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-13 02:31:17,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:17,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-13 02:31:17,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:31:17,189 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:17,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:17,327 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-13 02:31:17,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-13 02:31:17,327 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-13 02:31:17,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:17,328 INFO L225 Difference]: With dead ends: 62 [2021-11-13 02:31:17,328 INFO L226 Difference]: Without dead ends: 35 [2021-11-13 02:31:17,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=203, Invalid=789, Unknown=0, NotChecked=0, Total=992 [2021-11-13 02:31:17,330 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 3 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.66ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 57.16ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:17,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 46 Invalid, 93 Unknown, 0 Unchecked, 0.66ms Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 57.16ms Time] [2021-11-13 02:31:17,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-13 02:31:17,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-13 02:31:17,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:17,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-13 02:31:17,336 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2021-11-13 02:31:17,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:17,336 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-13 02:31:17,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:17,336 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-13 02:31:17,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-13 02:31:17,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:17,338 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2021-11-13 02:31:17,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:17,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable230,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:17,552 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:17,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:17,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1388678, now seen corresponding path program 14 times [2021-11-13 02:31:17,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:17,553 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978117315] [2021-11-13 02:31:17,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:17,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:17,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:17,657 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:17,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:17,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978117315] [2021-11-13 02:31:17,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978117315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:17,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386713011] [2021-11-13 02:31:17,658 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:17,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:17,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:17,659 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:17,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 02:31:17,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-13 02:31:17,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:17,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-13 02:31:17,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:17,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:17,924 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:17,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386713011] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:17,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427171630] [2021-11-13 02:31:17,930 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:17,930 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:17,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:17,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:17,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:17,937 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,938 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:17,939 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:17,939 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:17,940 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:17,941 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:17,942 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 10=[|v_#valid_22|]} [2021-11-13 02:31:17,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:17,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:17,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:17,951 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:17,951 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:17,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:17,954 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:17,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:17,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:17,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:17,964 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 23 treesize of output 22 [2021-11-13 02:31:17,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,966 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:17,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:17,967 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:17,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:17,972 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:17,974 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:17,974 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:17,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:17,978 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:17,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:17,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:17,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:18,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:18,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,059 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:18,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:18,064 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:18,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:18,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:18,083 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:18,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:18,090 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:18,407 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:18,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:18,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2021-11-13 02:31:18,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324309158] [2021-11-13 02:31:18,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:18,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 02:31:18,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:18,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 02:31:18,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2021-11-13 02:31:18,408 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:18,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:18,585 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-11-13 02:31:18,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 02:31:18,585 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-13 02:31:18,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:18,585 INFO L225 Difference]: With dead ends: 46 [2021-11-13 02:31:18,585 INFO L226 Difference]: Without dead ends: 44 [2021-11-13 02:31:18,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=217, Invalid=595, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:31:18,587 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 35 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.84ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 74.74ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:18,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 16 Invalid, 130 Unknown, 0 Unchecked, 0.84ms Time], IncrementalHoareTripleChecker [36 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 74.74ms Time] [2021-11-13 02:31:18,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-13 02:31:18,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2021-11-13 02:31:18,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:18,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-11-13 02:31:18,606 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2021-11-13 02:31:18,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:18,607 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-11-13 02:31:18,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:18,607 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-11-13 02:31:18,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-13 02:31:18,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:18,607 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1] [2021-11-13 02:31:18,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-13 02:31:18,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable249 [2021-11-13 02:31:18,808 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:18,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:18,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1574746381, now seen corresponding path program 15 times [2021-11-13 02:31:18,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:18,809 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092488185] [2021-11-13 02:31:18,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:18,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:18,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:18,972 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:18,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:18,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092488185] [2021-11-13 02:31:18,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092488185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:18,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071257975] [2021-11-13 02:31:18,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:18,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:18,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:18,977 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:18,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 02:31:19,025 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:19,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:19,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-13 02:31:19,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:19,154 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:19,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:19,249 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:19,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071257975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:19,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [660351415] [2021-11-13 02:31:19,252 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:19,253 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:19,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:19,253 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:19,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:19,257 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,258 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:19,259 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:19,260 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:19,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,260 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:19,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:19,264 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_22|], 10=[|v_#valid_23|]} [2021-11-13 02:31:19,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:19,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:19,270 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,271 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:19,271 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:19,272 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:19,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:19,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:19,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:19,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:19,286 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 23 treesize of output 22 [2021-11-13 02:31:19,287 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:19,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:19,290 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:19,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,294 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:19,295 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:19,295 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:19,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:19,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,354 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:19,359 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:19,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,392 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:19,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:19,398 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:19,401 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:19,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:19,420 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:19,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:19,427 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:19,758 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:19,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:19,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 20 [2021-11-13 02:31:19,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723482497] [2021-11-13 02:31:19,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:19,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-13 02:31:19,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:19,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-13 02:31:19,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2021-11-13 02:31:19,760 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:19,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:19,925 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-11-13 02:31:19,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 02:31:19,926 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-13 02:31:19,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:19,926 INFO L225 Difference]: With dead ends: 69 [2021-11-13 02:31:19,926 INFO L226 Difference]: Without dead ends: 39 [2021-11-13 02:31:19,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=244, Invalid=946, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 02:31:19,927 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.76ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.41ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:19,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 57 Invalid, 113 Unknown, 0 Unchecked, 0.76ms Time], IncrementalHoareTripleChecker [6 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 68.41ms Time] [2021-11-13 02:31:19,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-13 02:31:19,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-13 02:31:19,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:19,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-11-13 02:31:19,933 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2021-11-13 02:31:19,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:19,933 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-11-13 02:31:19,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:19,934 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-11-13 02:31:19,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 02:31:19,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:19,936 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2021-11-13 02:31:19,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:20,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable268 [2021-11-13 02:31:20,148 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:20,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:20,149 INFO L85 PathProgramCache]: Analyzing trace with hash -306741206, now seen corresponding path program 16 times [2021-11-13 02:31:20,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:20,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22553003] [2021-11-13 02:31:20,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:20,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:20,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:20,250 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:20,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:20,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22553003] [2021-11-13 02:31:20,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22553003] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:20,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808912690] [2021-11-13 02:31:20,251 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:20,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:20,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:20,252 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:20,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 02:31:20,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:20,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 02:31:20,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:20,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:20,511 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:20,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808912690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:20,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761587685] [2021-11-13 02:31:20,513 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:20,513 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:20,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:20,513 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:20,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:20,521 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,522 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:20,522 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,522 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:20,523 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:20,523 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:20,525 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:20,527 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_23|], 10=[|v_#valid_24|]} [2021-11-13 02:31:20,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:20,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:20,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:20,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:20,535 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:20,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,538 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:20,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:20,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:20,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:20,546 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 23 treesize of output 22 [2021-11-13 02:31:20,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:20,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,548 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:20,549 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:20,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:20,553 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:20,553 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:20,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,556 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:20,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,588 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:20,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:20,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,618 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:20,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:20,624 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:20,627 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:20,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:20,641 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:20,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:20,653 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:20,944 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:20,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:20,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2021-11-13 02:31:20,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088116875] [2021-11-13 02:31:20,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:20,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 02:31:20,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:20,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 02:31:20,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-13 02:31:20,945 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:21,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:21,115 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-11-13 02:31:21,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 02:31:21,115 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-13 02:31:21,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:21,116 INFO L225 Difference]: With dead ends: 50 [2021-11-13 02:31:21,116 INFO L226 Difference]: Without dead ends: 48 [2021-11-13 02:31:21,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=252, Invalid=678, Unknown=0, NotChecked=0, Total=930 [2021-11-13 02:31:21,117 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.72ms SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.74ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:21,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 11 Invalid, 140 Unknown, 0 Unchecked, 0.72ms Time], IncrementalHoareTripleChecker [49 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 82.74ms Time] [2021-11-13 02:31:21,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-13 02:31:21,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-11-13 02:31:21,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:21,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-11-13 02:31:21,132 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-11-13 02:31:21,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:21,133 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-11-13 02:31:21,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:21,133 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-11-13 02:31:21,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-13 02:31:21,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:21,134 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1] [2021-11-13 02:31:21,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:21,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable287 [2021-11-13 02:31:21,360 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:21,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:21,361 INFO L85 PathProgramCache]: Analyzing trace with hash 1567958223, now seen corresponding path program 17 times [2021-11-13 02:31:21,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:21,361 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409821596] [2021-11-13 02:31:21,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:21,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:21,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:21,553 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:21,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:21,553 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409821596] [2021-11-13 02:31:21,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409821596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:21,553 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295141251] [2021-11-13 02:31:21,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:21,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:21,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:21,555 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:21,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 02:31:21,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-13 02:31:21,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:21,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 02:31:21,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:21,733 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:21,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:21,814 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:21,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295141251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:21,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [652142029] [2021-11-13 02:31:21,816 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:21,816 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:21,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:21,816 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:21,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:21,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,842 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:21,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:21,843 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:21,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:21,845 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:21,847 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_24|], 10=[|v_#valid_25|]} [2021-11-13 02:31:21,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:21,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:21,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:21,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:21,855 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:21,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:21,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:21,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:21,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:21,868 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 23 treesize of output 22 [2021-11-13 02:31:21,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:21,871 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:21,871 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:21,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,874 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,875 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:21,876 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:21,876 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:21,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,880 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:21,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:21,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:21,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,936 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:21,938 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:21,942 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:21,949 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:21,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:21,978 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:21,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:21,984 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:22,304 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:22,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:22,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 22 [2021-11-13 02:31:22,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065328732] [2021-11-13 02:31:22,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:22,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-13 02:31:22,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:22,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-13 02:31:22,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=597, Unknown=0, NotChecked=0, Total=756 [2021-11-13 02:31:22,307 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:22,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:22,554 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-13 02:31:22,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 02:31:22,554 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-13 02:31:22,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:22,555 INFO L225 Difference]: With dead ends: 76 [2021-11-13 02:31:22,555 INFO L226 Difference]: Without dead ends: 43 [2021-11-13 02:31:22,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=289, Invalid=1117, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 02:31:22,557 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 3 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 78.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.80ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 109.09ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:22,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 94 Invalid, 174 Unknown, 0 Unchecked, 1.80ms Time], IncrementalHoareTripleChecker [5 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 109.09ms Time] [2021-11-13 02:31:22,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-13 02:31:22,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-13 02:31:22,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:22,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-11-13 02:31:22,563 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2021-11-13 02:31:22,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:22,563 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-11-13 02:31:22,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:22,564 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-11-13 02:31:22,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-13 02:31:22,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:22,564 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2021-11-13 02:31:22,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:22,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable306,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:22,776 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:22,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:22,777 INFO L85 PathProgramCache]: Analyzing trace with hash -448009594, now seen corresponding path program 18 times [2021-11-13 02:31:22,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:22,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88975460] [2021-11-13 02:31:22,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:22,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:22,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:22,907 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:22,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88975460] [2021-11-13 02:31:22,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88975460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:22,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152498715] [2021-11-13 02:31:22,907 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:22,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:22,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:22,909 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:22,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 02:31:22,976 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:22,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:22,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 02:31:22,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:23,110 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:23,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:23,248 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:23,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152498715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:23,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [23734637] [2021-11-13 02:31:23,250 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:23,250 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:23,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:23,251 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:23,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:23,254 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,255 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:23,255 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:23,256 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:23,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:23,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:23,264 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_25|], 10=[|v_#valid_26|]} [2021-11-13 02:31:23,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:23,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:23,272 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:23,273 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:23,274 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:23,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:23,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:23,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:23,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:23,287 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 23 treesize of output 22 [2021-11-13 02:31:23,292 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:23,295 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:23,295 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:23,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,298 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:23,301 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:23,301 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:23,303 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:23,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:23,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:23,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,373 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:23,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:23,379 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:23,381 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:23,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:23,395 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:23,397 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:23,402 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:23,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:23,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:23,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2021-11-13 02:31:23,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898701868] [2021-11-13 02:31:23,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:23,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 02:31:23,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:23,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 02:31:23,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-13 02:31:23,711 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:23,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:23,896 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-11-13 02:31:23,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 02:31:23,897 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-13 02:31:23,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:23,897 INFO L225 Difference]: With dead ends: 54 [2021-11-13 02:31:23,897 INFO L226 Difference]: Without dead ends: 52 [2021-11-13 02:31:23,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2021-11-13 02:31:23,899 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 49 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 64.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.10ms SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 78.69ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:23,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 15 Invalid, 152 Unknown, 0 Unchecked, 1.10ms Time], IncrementalHoareTripleChecker [54 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 78.69ms Time] [2021-11-13 02:31:23,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-13 02:31:23,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2021-11-13 02:31:23,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:23,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-11-13 02:31:23,906 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2021-11-13 02:31:23,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:23,906 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-11-13 02:31:23,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:23,907 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-11-13 02:31:23,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-13 02:31:23,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:23,908 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1] [2021-11-13 02:31:23,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:24,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable325,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:24,116 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:24,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:24,117 INFO L85 PathProgramCache]: Analyzing trace with hash 2109361395, now seen corresponding path program 19 times [2021-11-13 02:31:24,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:24,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747265374] [2021-11-13 02:31:24,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:24,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:24,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:24,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:24,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747265374] [2021-11-13 02:31:24,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747265374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:24,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975620065] [2021-11-13 02:31:24,333 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:24,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:24,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:24,334 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:24,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 02:31:24,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:24,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-13 02:31:24,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:24,503 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:24,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:24,605 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:24,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975620065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:24,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205666333] [2021-11-13 02:31:24,607 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:24,607 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:24,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:24,608 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:24,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:24,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,616 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:24,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:24,618 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:24,622 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:24,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:24,634 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_26|], 10=[|v_#valid_27|]} [2021-11-13 02:31:24,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:24,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:24,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,642 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:24,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:24,643 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:24,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:24,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:24,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:24,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:24,655 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 23 treesize of output 22 [2021-11-13 02:31:24,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:24,658 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:24,658 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:24,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,661 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,661 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:24,662 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:24,662 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:24,664 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,665 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:24,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,695 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:24,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:24,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,728 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:24,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:24,735 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:24,738 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:24,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:24,763 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:24,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:24,770 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:25,087 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:25,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:25,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 24 [2021-11-13 02:31:25,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864067766] [2021-11-13 02:31:25,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:25,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 02:31:25,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:25,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 02:31:25,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=686, Unknown=0, NotChecked=0, Total=870 [2021-11-13 02:31:25,089 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:25,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:25,272 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-13 02:31:25,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 02:31:25,272 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-13 02:31:25,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:25,273 INFO L225 Difference]: With dead ends: 83 [2021-11-13 02:31:25,273 INFO L226 Difference]: Without dead ends: 47 [2021-11-13 02:31:25,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=338, Invalid=1302, Unknown=0, NotChecked=0, Total=1640 [2021-11-13 02:31:25,274 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 37.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.66ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.50ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:25,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 52 Invalid, 106 Unknown, 0 Unchecked, 0.66ms Time], IncrementalHoareTripleChecker [6 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 52.50ms Time] [2021-11-13 02:31:25,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-13 02:31:25,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-13 02:31:25,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:25,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-13 02:31:25,281 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2021-11-13 02:31:25,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:25,281 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-13 02:31:25,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:25,281 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-13 02:31:25,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-13 02:31:25,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:25,283 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2021-11-13 02:31:25,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:25,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable344 [2021-11-13 02:31:25,492 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:25,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:25,493 INFO L85 PathProgramCache]: Analyzing trace with hash 213475114, now seen corresponding path program 20 times [2021-11-13 02:31:25,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:25,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796851070] [2021-11-13 02:31:25,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:25,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:25,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:25,633 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 55 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:25,633 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:25,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796851070] [2021-11-13 02:31:25,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796851070] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:25,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805689802] [2021-11-13 02:31:25,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:25,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:25,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:25,635 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:25,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 02:31:25,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-13 02:31:25,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:25,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-13 02:31:25,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:25,815 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:25,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:25,928 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:25,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805689802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:25,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2081809835] [2021-11-13 02:31:25,930 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:25,930 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:25,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:25,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:25,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:25,938 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,939 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:25,939 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:25,940 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:25,940 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:25,944 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:25,946 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_27|], 10=[|v_#valid_28|]} [2021-11-13 02:31:25,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:25,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:25,952 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,952 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:25,953 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:25,953 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:25,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:25,954 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:25,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:25,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:25,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:25,962 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 23 treesize of output 22 [2021-11-13 02:31:25,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:25,964 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:25,964 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:25,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:25,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:25,968 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:25,968 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:25,974 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:25,979 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:25,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:25,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:25,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:26,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:26,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,035 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:26,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:26,041 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:26,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:26,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:26,059 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:26,061 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:26,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:26,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:26,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:26,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2021-11-13 02:31:26,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085406892] [2021-11-13 02:31:26,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:26,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 02:31:26,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:26,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 02:31:26,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-13 02:31:26,370 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:26,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:26,587 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-11-13 02:31:26,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-13 02:31:26,587 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-13 02:31:26,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:26,588 INFO L225 Difference]: With dead ends: 58 [2021-11-13 02:31:26,588 INFO L226 Difference]: Without dead ends: 56 [2021-11-13 02:31:26,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=331, Invalid=859, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 02:31:26,589 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 42 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 76.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.17ms SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 90.62ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:26,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 16 Invalid, 172 Unknown, 0 Unchecked, 1.17ms Time], IncrementalHoareTripleChecker [48 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 90.62ms Time] [2021-11-13 02:31:26,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-13 02:31:26,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-11-13 02:31:26,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:26,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-11-13 02:31:26,596 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2021-11-13 02:31:26,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:26,596 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-11-13 02:31:26,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:26,597 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-11-13 02:31:26,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-13 02:31:26,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:26,597 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1] [2021-11-13 02:31:26,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:26,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable363,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:26,804 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:26,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:26,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1204623921, now seen corresponding path program 21 times [2021-11-13 02:31:26,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:26,805 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055205798] [2021-11-13 02:31:26,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:26,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:26,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:27,126 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:27,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:27,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055205798] [2021-11-13 02:31:27,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055205798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:27,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641627932] [2021-11-13 02:31:27,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:27,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:27,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:27,128 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:27,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 02:31:27,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:27,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:27,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-13 02:31:27,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:27,311 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:27,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:27,444 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:27,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641627932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:27,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903821791] [2021-11-13 02:31:27,446 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:27,446 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:27,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:27,446 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:27,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:27,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,454 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:27,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:27,455 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:27,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:27,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:27,468 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_28|], 10=[|v_#valid_29|]} [2021-11-13 02:31:27,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:27,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:27,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:27,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,475 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:27,475 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:27,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,478 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:27,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:27,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:27,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:27,485 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 23 treesize of output 22 [2021-11-13 02:31:27,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:27,487 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:27,488 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:27,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,489 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,490 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,490 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:27,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:27,491 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:27,492 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,493 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:27,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:27,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:27,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,538 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:27,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:27,544 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:27,546 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:27,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:27,562 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:27,564 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:27,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:27,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:27,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:27,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 26 [2021-11-13 02:31:27,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732941539] [2021-11-13 02:31:27,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:27,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-13 02:31:27,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:27,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-13 02:31:27,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2021-11-13 02:31:27,920 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:28,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:28,149 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-11-13 02:31:28,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 02:31:28,149 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-13 02:31:28,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:28,150 INFO L225 Difference]: With dead ends: 90 [2021-11-13 02:31:28,150 INFO L226 Difference]: Without dead ends: 51 [2021-11-13 02:31:28,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=391, Invalid=1501, Unknown=0, NotChecked=0, Total=1892 [2021-11-13 02:31:28,152 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 3 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.11ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.73ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:28,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 79 Invalid, 156 Unknown, 0 Unchecked, 1.11ms Time], IncrementalHoareTripleChecker [5 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 76.73ms Time] [2021-11-13 02:31:28,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-13 02:31:28,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-13 02:31:28,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:28,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-11-13 02:31:28,159 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2021-11-13 02:31:28,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:28,159 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-11-13 02:31:28,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:28,160 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-11-13 02:31:28,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-13 02:31:28,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:28,161 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2021-11-13 02:31:28,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:28,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable382,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:28,372 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:28,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:28,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1335884666, now seen corresponding path program 22 times [2021-11-13 02:31:28,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:28,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558650429] [2021-11-13 02:31:28,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:28,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:28,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:28,528 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 66 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:28,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:28,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558650429] [2021-11-13 02:31:28,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558650429] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:28,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439301735] [2021-11-13 02:31:28,528 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:28,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:28,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:28,529 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:28,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 02:31:28,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:28,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-13 02:31:28,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:28,766 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:28,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:28,937 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:28,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439301735] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:28,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [925446069] [2021-11-13 02:31:28,942 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:28,942 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:28,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:28,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:28,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:28,954 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,955 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:28,956 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,957 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:28,957 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:28,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:28,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:28,963 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_29|], 10=[|v_#valid_30|]} [2021-11-13 02:31:28,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:28,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:28,971 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,971 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:28,972 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,972 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:28,973 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:28,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:28,975 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:28,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:28,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:28,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:28,987 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 23 treesize of output 22 [2021-11-13 02:31:28,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:28,990 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:28,991 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:28,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:28,993 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,995 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:28,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:28,996 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:28,997 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:28,999 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:29,002 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:29,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:29,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:29,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,054 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:29,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:29,059 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:29,060 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:29,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:29,071 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:29,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:29,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:29,380 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:29,380 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:29,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2021-11-13 02:31:29,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320496377] [2021-11-13 02:31:29,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:29,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 02:31:29,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:29,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 02:31:29,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2021-11-13 02:31:29,382 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:29,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:29,626 INFO L93 Difference]: Finished difference Result 62 states and 63 transitions. [2021-11-13 02:31:29,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-13 02:31:29,626 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-13 02:31:29,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:29,627 INFO L225 Difference]: With dead ends: 62 [2021-11-13 02:31:29,627 INFO L226 Difference]: Without dead ends: 60 [2021-11-13 02:31:29,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=375, Invalid=957, Unknown=0, NotChecked=0, Total=1332 [2021-11-13 02:31:29,628 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 43 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 79.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.30ms SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 101.69ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:29,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 20 Invalid, 202 Unknown, 0 Unchecked, 1.30ms Time], IncrementalHoareTripleChecker [52 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 101.69ms Time] [2021-11-13 02:31:29,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-13 02:31:29,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-13 02:31:29,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:29,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-13 02:31:29,634 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2021-11-13 02:31:29,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:29,635 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-13 02:31:29,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:29,635 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-13 02:31:29,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 02:31:29,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:29,636 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1] [2021-11-13 02:31:29,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:29,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable401,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:29,836 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:29,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:29,836 INFO L85 PathProgramCache]: Analyzing trace with hash -168299789, now seen corresponding path program 23 times [2021-11-13 02:31:29,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:29,837 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439482850] [2021-11-13 02:31:29,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:29,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:29,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:30,114 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:30,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:30,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439482850] [2021-11-13 02:31:30,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439482850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:30,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990509094] [2021-11-13 02:31:30,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:30,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:30,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:30,115 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:30,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 02:31:30,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-13 02:31:30,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:30,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-13 02:31:30,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:30,302 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:30,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:30,407 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:30,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990509094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:30,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1669872444] [2021-11-13 02:31:30,409 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:30,410 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:30,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:30,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:30,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:30,418 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,419 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:30,419 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:30,420 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:30,421 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,421 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:30,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:30,428 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_30|], 10=[|v_#valid_31|]} [2021-11-13 02:31:30,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:30,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:30,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:30,436 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:30,437 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:30,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,448 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:30,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:30,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:30,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:30,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:31:30,459 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:30,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:30,462 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:30,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,464 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,465 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:30,467 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:30,467 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:30,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,472 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:30,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,494 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:30,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:30,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,525 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:30,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:30,542 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:30,545 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:30,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:30,564 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:30,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:30,572 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:30,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:30,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:30,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 28 [2021-11-13 02:31:30,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037755032] [2021-11-13 02:31:30,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:30,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 02:31:30,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:30,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 02:31:30,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=882, Unknown=0, NotChecked=0, Total=1122 [2021-11-13 02:31:30,990 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:31,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:31,315 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-11-13 02:31:31,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-13 02:31:31,315 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-13 02:31:31,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:31,316 INFO L225 Difference]: With dead ends: 97 [2021-11-13 02:31:31,316 INFO L226 Difference]: Without dead ends: 55 [2021-11-13 02:31:31,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=448, Invalid=1714, Unknown=0, NotChecked=0, Total=2162 [2021-11-13 02:31:31,318 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 103.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.46ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 123.19ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:31,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 153 Invalid, 291 Unknown, 0 Unchecked, 1.46ms Time], IncrementalHoareTripleChecker [4 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 123.19ms Time] [2021-11-13 02:31:31,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-13 02:31:31,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-13 02:31:31,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:31,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-11-13 02:31:31,325 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2021-11-13 02:31:31,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:31,325 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-11-13 02:31:31,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:31,326 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-11-13 02:31:31,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-13 02:31:31,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:31,326 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2021-11-13 02:31:31,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:31,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable420 [2021-11-13 02:31:31,532 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:31,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:31,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1065820630, now seen corresponding path program 24 times [2021-11-13 02:31:31,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:31,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598138614] [2021-11-13 02:31:31,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:31,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:31,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:31,694 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 78 proven. 235 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:31,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:31,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598138614] [2021-11-13 02:31:31,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598138614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:31,695 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440971623] [2021-11-13 02:31:31,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:31,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:31,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:31,696 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:31,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 02:31:31,764 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:31,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:31,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 02:31:31,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:31,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:32,104 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:32,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440971623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:32,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1879539746] [2021-11-13 02:31:32,106 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:32,106 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:32,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:32,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:32,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:32,111 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,111 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:32,112 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:32,113 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:32,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:32,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:32,118 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_31|], 10=[|v_#valid_32|]} [2021-11-13 02:31:32,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:32,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:32,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,125 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:32,126 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:32,127 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:32,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,129 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:32,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:32,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:32,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:32,139 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 23 treesize of output 22 [2021-11-13 02:31:32,140 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,141 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:32,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:32,142 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:32,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,146 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:32,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:32,148 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:32,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:32,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:32,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:32,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,217 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:32,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:32,222 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:32,225 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:32,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:32,240 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:32,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:32,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:32,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:32,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:32,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2021-11-13 02:31:32,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284030124] [2021-11-13 02:31:32,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:32,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-13 02:31:32,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:32,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-13 02:31:32,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:31:32,552 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:32,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:32,790 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2021-11-13 02:31:32,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-13 02:31:32,791 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-13 02:31:32,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:32,791 INFO L225 Difference]: With dead ends: 66 [2021-11-13 02:31:32,791 INFO L226 Difference]: Without dead ends: 64 [2021-11-13 02:31:32,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2021-11-13 02:31:32,793 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 61 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 68.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.11ms SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 94.11ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:32,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 15 Invalid, 197 Unknown, 0 Unchecked, 1.11ms Time], IncrementalHoareTripleChecker [69 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 94.11ms Time] [2021-11-13 02:31:32,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-13 02:31:32,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2021-11-13 02:31:32,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:32,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-11-13 02:31:32,801 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2021-11-13 02:31:32,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:32,801 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-11-13 02:31:32,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:32,801 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-11-13 02:31:32,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-13 02:31:32,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:32,802 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1] [2021-11-13 02:31:32,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:33,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable439,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:33,024 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:33,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:33,024 INFO L85 PathProgramCache]: Analyzing trace with hash 835651279, now seen corresponding path program 25 times [2021-11-13 02:31:33,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:33,025 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313537555] [2021-11-13 02:31:33,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:33,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:33,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:33,356 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:33,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:33,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313537555] [2021-11-13 02:31:33,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313537555] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:33,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526177099] [2021-11-13 02:31:33,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:33,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:33,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:33,358 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:33,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-13 02:31:33,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:33,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 02:31:33,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:33,552 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:33,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:33,671 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:33,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526177099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:33,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [548332275] [2021-11-13 02:31:33,673 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:33,673 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:33,674 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:33,674 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:33,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:33,677 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,677 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:33,678 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,678 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:33,678 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:33,679 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:33,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:33,683 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_32|], 10=[|v_#valid_33|]} [2021-11-13 02:31:33,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:33,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:33,689 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,690 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:33,690 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,691 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:33,691 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:33,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,693 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:33,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:33,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:33,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:33,702 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 23 treesize of output 22 [2021-11-13 02:31:33,703 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:33,705 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:33,705 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:33,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,707 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,708 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,709 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:33,709 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:33,710 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:33,711 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,713 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:33,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,733 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:33,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:33,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,774 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:33,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:33,782 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:33,788 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:33,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:33,801 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:33,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:33,806 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:34,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:34,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:34,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 30 [2021-11-13 02:31:34,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35642048] [2021-11-13 02:31:34,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:34,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-13 02:31:34,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:34,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-13 02:31:34,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=989, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 02:31:34,189 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:34,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:34,452 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2021-11-13 02:31:34,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 02:31:34,452 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-13 02:31:34,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:34,453 INFO L225 Difference]: With dead ends: 104 [2021-11-13 02:31:34,453 INFO L226 Difference]: Without dead ends: 59 [2021-11-13 02:31:34,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=509, Invalid=1941, Unknown=0, NotChecked=0, Total=2450 [2021-11-13 02:31:34,455 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 66.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.96ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 83.51ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:34,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 110 Invalid, 214 Unknown, 0 Unchecked, 0.96ms Time], IncrementalHoareTripleChecker [5 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 83.51ms Time] [2021-11-13 02:31:34,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-13 02:31:34,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-13 02:31:34,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:34,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-13 02:31:34,461 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2021-11-13 02:31:34,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:34,461 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-13 02:31:34,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:34,461 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-13 02:31:34,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-13 02:31:34,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:34,462 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2021-11-13 02:31:34,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:34,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable458 [2021-11-13 02:31:34,662 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:34,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:34,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1360429434, now seen corresponding path program 26 times [2021-11-13 02:31:34,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:34,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242092191] [2021-11-13 02:31:34,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:34,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:34,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:34,858 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 91 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:34,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:34,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242092191] [2021-11-13 02:31:34,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242092191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:34,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689693190] [2021-11-13 02:31:34,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:34,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:34,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:34,860 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:34,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-13 02:31:34,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-13 02:31:34,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:34,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-13 02:31:34,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:35,125 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:35,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:35,289 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:35,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689693190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:35,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [262575597] [2021-11-13 02:31:35,291 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:35,291 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:35,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:35,292 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:35,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:35,295 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,296 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:35,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,297 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:35,297 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:35,298 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:35,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:35,302 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_33|], 10=[|v_#valid_34|]} [2021-11-13 02:31:35,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:35,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:35,309 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:35,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:35,311 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:35,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:35,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:35,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:35,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:35,325 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 23 treesize of output 22 [2021-11-13 02:31:35,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:35,328 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:35,328 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:35,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,331 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,332 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,333 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:35,334 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:35,334 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:35,336 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,338 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:35,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,362 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:35,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:35,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,394 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:35,396 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:35,401 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:35,403 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:35,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:35,419 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:35,421 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:35,426 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:35,758 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:35,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:35,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2021-11-13 02:31:35,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087420643] [2021-11-13 02:31:35,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:35,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-13 02:31:35,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:35,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-13 02:31:35,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=435, Unknown=0, NotChecked=0, Total=600 [2021-11-13 02:31:35,761 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:36,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:36,052 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2021-11-13 02:31:36,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-13 02:31:36,052 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-13 02:31:36,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:36,053 INFO L225 Difference]: With dead ends: 70 [2021-11-13 02:31:36,053 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 02:31:36,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=472, Invalid=1168, Unknown=0, NotChecked=0, Total=1640 [2021-11-13 02:31:36,055 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 67 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 108.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.35ms SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 127.84ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:36,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 13 Invalid, 206 Unknown, 0 Unchecked, 1.35ms Time], IncrementalHoareTripleChecker [74 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 127.84ms Time] [2021-11-13 02:31:36,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 02:31:36,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2021-11-13 02:31:36,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:36,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-11-13 02:31:36,063 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2021-11-13 02:31:36,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:36,063 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-11-13 02:31:36,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:36,064 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-11-13 02:31:36,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-13 02:31:36,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:36,065 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1] [2021-11-13 02:31:36,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-13 02:31:36,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable477 [2021-11-13 02:31:36,280 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:36,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:36,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1237042957, now seen corresponding path program 27 times [2021-11-13 02:31:36,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:36,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40649800] [2021-11-13 02:31:36,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:36,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:36,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:36,647 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:36,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:36,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40649800] [2021-11-13 02:31:36,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40649800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:36,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650389174] [2021-11-13 02:31:36,648 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:36,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:36,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:36,649 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:36,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-13 02:31:36,720 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:36,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:36,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 02:31:36,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:36,867 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:36,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:36,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650389174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:36,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509269433] [2021-11-13 02:31:37,002 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:37,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:37,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:37,002 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:37,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:37,006 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,006 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:37,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:37,008 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:37,008 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:37,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:37,011 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_34|], 10=[|v_#valid_35|]} [2021-11-13 02:31:37,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:37,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:37,018 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:37,019 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:37,019 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:37,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,022 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:37,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:37,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:37,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:37,031 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 23 treesize of output 22 [2021-11-13 02:31:37,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:37,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:37,034 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:37,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,038 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:37,039 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:37,039 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:37,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,043 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:37,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,075 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:37,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:37,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,107 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:37,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:37,114 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:37,116 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:37,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:37,137 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:37,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:37,144 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:37,571 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:37,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:37,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 32 [2021-11-13 02:31:37,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589738585] [2021-11-13 02:31:37,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:37,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-13 02:31:37,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:37,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-13 02:31:37,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1102, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 02:31:37,573 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:37,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:37,934 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-11-13 02:31:37,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 02:31:37,934 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-13 02:31:37,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:37,935 INFO L225 Difference]: With dead ends: 111 [2021-11-13 02:31:37,935 INFO L226 Difference]: Without dead ends: 63 [2021-11-13 02:31:37,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=574, Invalid=2182, Unknown=0, NotChecked=0, Total=2756 [2021-11-13 02:31:37,936 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 3 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 93.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.39ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 111.23ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:37,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 121 Invalid, 241 Unknown, 0 Unchecked, 1.39ms Time], IncrementalHoareTripleChecker [5 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 111.23ms Time] [2021-11-13 02:31:37,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-13 02:31:37,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-13 02:31:37,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:37,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-11-13 02:31:37,958 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2021-11-13 02:31:37,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:37,959 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-11-13 02:31:37,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:37,960 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-11-13 02:31:37,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-13 02:31:37,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:37,960 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2021-11-13 02:31:37,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:38,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable496 [2021-11-13 02:31:38,184 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:38,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:38,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1386349270, now seen corresponding path program 28 times [2021-11-13 02:31:38,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:38,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146844054] [2021-11-13 02:31:38,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:38,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:38,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:38,410 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 105 proven. 316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:38,410 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:38,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146844054] [2021-11-13 02:31:38,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146844054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:38,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516603849] [2021-11-13 02:31:38,411 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:38,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:38,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:38,412 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:38,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-13 02:31:38,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:38,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-13 02:31:38,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:38,662 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:38,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:38,849 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:38,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516603849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:38,850 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [329886712] [2021-11-13 02:31:38,851 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:38,851 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:38,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:38,852 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:38,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:38,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,855 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:38,856 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:38,856 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:38,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:38,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:38,860 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_35|], 10=[|v_#valid_36|]} [2021-11-13 02:31:38,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:38,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:38,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:38,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:38,867 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:38,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:38,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:38,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:38,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:38,878 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 23 treesize of output 22 [2021-11-13 02:31:38,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:38,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:38,881 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:38,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:38,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:38,886 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:38,887 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,889 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:38,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,911 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:38,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:38,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,941 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:38,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:38,948 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:38,950 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:38,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:38,965 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:38,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:38,972 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:39,328 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:39,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:39,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 20 [2021-11-13 02:31:39,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942176113] [2021-11-13 02:31:39,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:39,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-13 02:31:39,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:39,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-13 02:31:39,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2021-11-13 02:31:39,330 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:39,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:39,649 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-11-13 02:31:39,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-13 02:31:39,650 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-13 02:31:39,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:39,650 INFO L225 Difference]: With dead ends: 74 [2021-11-13 02:31:39,651 INFO L226 Difference]: Without dead ends: 72 [2021-11-13 02:31:39,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 190 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=525, Invalid=1281, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 02:31:39,652 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 69 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 97.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.62ms SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 115.97ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:39,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 15 Invalid, 221 Unknown, 0 Unchecked, 1.62ms Time], IncrementalHoareTripleChecker [79 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 115.97ms Time] [2021-11-13 02:31:39,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-13 02:31:39,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2021-11-13 02:31:39,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:39,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-13 02:31:39,660 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2021-11-13 02:31:39,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:39,661 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-13 02:31:39,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:39,661 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-13 02:31:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-13 02:31:39,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:39,662 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1] [2021-11-13 02:31:39,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:39,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable515,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:39,892 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:39,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:39,892 INFO L85 PathProgramCache]: Analyzing trace with hash -320763953, now seen corresponding path program 29 times [2021-11-13 02:31:39,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:39,893 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150371588] [2021-11-13 02:31:39,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:39,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:39,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:40,325 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:40,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:40,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150371588] [2021-11-13 02:31:40,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150371588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:40,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230719484] [2021-11-13 02:31:40,326 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:40,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:40,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:40,327 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:40,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-13 02:31:40,406 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-13 02:31:40,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:40,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-13 02:31:40,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:40,573 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:40,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:40,745 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:40,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230719484] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:40,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419060918] [2021-11-13 02:31:40,747 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:40,747 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:40,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:40,748 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:40,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:40,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,751 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:40,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:40,752 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:40,753 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:40,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:40,756 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_36|], 10=[|v_#valid_37|]} [2021-11-13 02:31:40,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:40,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:40,762 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:40,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:40,763 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:40,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,766 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:40,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:40,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:40,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:40,774 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 23 treesize of output 22 [2021-11-13 02:31:40,775 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:40,776 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:40,777 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:40,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,779 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:40,781 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:40,782 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:40,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:40,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:40,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:40,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,837 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:40,839 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:40,843 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:40,845 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:40,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:40,859 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:40,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:40,864 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:41,192 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:41,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:41,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 34 [2021-11-13 02:31:41,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083259399] [2021-11-13 02:31:41,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:41,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-13 02:31:41,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:41,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-13 02:31:41,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=1221, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 02:31:41,194 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:41,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:41,560 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-11-13 02:31:41,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 02:31:41,561 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-13 02:31:41,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:41,563 INFO L225 Difference]: With dead ends: 118 [2021-11-13 02:31:41,563 INFO L226 Difference]: Without dead ends: 67 [2021-11-13 02:31:41,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=643, Invalid=2437, Unknown=0, NotChecked=0, Total=3080 [2021-11-13 02:31:41,564 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 99.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.33ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 133.44ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:41,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 154 Invalid, 299 Unknown, 0 Unchecked, 1.33ms Time], IncrementalHoareTripleChecker [6 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 133.44ms Time] [2021-11-13 02:31:41,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-13 02:31:41,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-13 02:31:41,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:41,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-11-13 02:31:41,572 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2021-11-13 02:31:41,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:41,572 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-11-13 02:31:41,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:41,573 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-11-13 02:31:41,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-13 02:31:41,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:41,573 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2021-11-13 02:31:41,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-13 02:31:41,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable534,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:41,776 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:41,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:41,777 INFO L85 PathProgramCache]: Analyzing trace with hash 2088786054, now seen corresponding path program 30 times [2021-11-13 02:31:41,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:41,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268352417] [2021-11-13 02:31:41,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:41,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:41,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:42,020 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 120 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:42,020 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:42,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268352417] [2021-11-13 02:31:42,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268352417] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:42,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133494852] [2021-11-13 02:31:42,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:42,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:42,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:42,021 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:42,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-13 02:31:42,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:42,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:42,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-13 02:31:42,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:42,256 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:42,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:42,416 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:42,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133494852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:42,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133213227] [2021-11-13 02:31:42,417 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:42,418 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:42,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:42,418 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:42,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:42,421 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,422 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:42,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:42,423 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:42,423 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:42,425 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:42,426 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_37|], 10=[|v_#valid_38|]} [2021-11-13 02:31:42,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:42,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:42,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,433 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:42,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:42,434 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:42,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:42,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:42,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:42,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:42,446 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 23 treesize of output 22 [2021-11-13 02:31:42,447 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,448 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:42,449 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:42,450 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:42,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,459 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:42,462 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:42,462 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:42,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:42,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:42,489 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:42,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,514 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:42,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:42,520 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:42,522 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:42,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:42,536 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:42,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:42,542 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:42,865 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:42,865 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:42,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 21 [2021-11-13 02:31:42,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638501304] [2021-11-13 02:31:42,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:42,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-13 02:31:42,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:42,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-13 02:31:42,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=502, Unknown=0, NotChecked=0, Total=702 [2021-11-13 02:31:42,867 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:43,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:43,159 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-13 02:31:43,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 02:31:43,159 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-13 02:31:43,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:43,160 INFO L225 Difference]: With dead ends: 78 [2021-11-13 02:31:43,160 INFO L226 Difference]: Without dead ends: 76 [2021-11-13 02:31:43,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=581, Invalid=1399, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 02:31:43,161 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 44 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 93.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.15ms SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 118.12ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:43,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 14 Invalid, 220 Unknown, 0 Unchecked, 1.15ms Time], IncrementalHoareTripleChecker [53 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 118.12ms Time] [2021-11-13 02:31:43,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-13 02:31:43,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2021-11-13 02:31:43,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:43,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-11-13 02:31:43,169 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2021-11-13 02:31:43,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:43,169 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-11-13 02:31:43,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:43,169 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-11-13 02:31:43,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-13 02:31:43,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:43,170 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1] [2021-11-13 02:31:43,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:43,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable553 [2021-11-13 02:31:43,384 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:43,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:43,385 INFO L85 PathProgramCache]: Analyzing trace with hash 1543970547, now seen corresponding path program 31 times [2021-11-13 02:31:43,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:43,385 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616515536] [2021-11-13 02:31:43,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:43,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:43,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:43,832 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:43,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:43,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616515536] [2021-11-13 02:31:43,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616515536] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:43,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501522653] [2021-11-13 02:31:43,832 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:43,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:43,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:43,833 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:43,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-13 02:31:43,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:43,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-13 02:31:43,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:44,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:44,219 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:44,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501522653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:44,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [862203523] [2021-11-13 02:31:44,221 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:44,221 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:44,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:44,221 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:44,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:44,224 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,225 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:44,225 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:44,226 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:44,226 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:44,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:44,230 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_38|], 10=[|v_#valid_39|]} [2021-11-13 02:31:44,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:44,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:44,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:44,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:44,238 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:44,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:44,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:44,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:44,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:44,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:31:44,250 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:44,252 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,253 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:44,253 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:44,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,254 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,255 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:44,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:44,256 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:44,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:44,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,279 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:44,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:44,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,308 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:44,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:44,320 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:44,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:44,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:44,338 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:44,341 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:44,346 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:44,735 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:44,735 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:44,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 36 [2021-11-13 02:31:44,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303557890] [2021-11-13 02:31:44,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:44,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-13 02:31:44,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:44,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-13 02:31:44,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=1346, Unknown=0, NotChecked=0, Total=1722 [2021-11-13 02:31:44,737 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:45,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:45,112 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-11-13 02:31:45,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-13 02:31:45,113 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-13 02:31:45,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:45,114 INFO L225 Difference]: With dead ends: 125 [2021-11-13 02:31:45,114 INFO L226 Difference]: Without dead ends: 71 [2021-11-13 02:31:45,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=716, Invalid=2706, Unknown=0, NotChecked=0, Total=3422 [2021-11-13 02:31:45,116 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 3 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 91.40ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.24ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 109.64ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:45,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 142 Invalid, 291 Unknown, 0 Unchecked, 1.24ms Time], IncrementalHoareTripleChecker [5 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 109.64ms Time] [2021-11-13 02:31:45,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-13 02:31:45,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-13 02:31:45,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:45,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-11-13 02:31:45,121 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 69 [2021-11-13 02:31:45,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:45,122 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-11-13 02:31:45,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:45,122 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-11-13 02:31:45,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-13 02:31:45,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:45,123 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2021-11-13 02:31:45,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-13 02:31:45,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable572,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:45,336 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:45,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:45,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1775287338, now seen corresponding path program 32 times [2021-11-13 02:31:45,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:45,337 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8271568] [2021-11-13 02:31:45,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:45,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:45,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 136 proven. 409 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:45,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:45,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8271568] [2021-11-13 02:31:45,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8271568] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:45,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975054297] [2021-11-13 02:31:45,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:45,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:45,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:45,588 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:45,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-13 02:31:45,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-13 02:31:45,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:45,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-13 02:31:45,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:45,896 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:45,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:46,081 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:46,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975054297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:46,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756538026] [2021-11-13 02:31:46,083 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:46,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:46,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:46,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:46,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:46,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,102 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:46,102 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,103 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:46,103 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:46,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:46,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:46,107 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_39|], 10=[|v_#valid_40|]} [2021-11-13 02:31:46,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:46,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:46,113 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:46,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:46,114 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:46,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:46,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:46,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:46,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:46,126 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 23 treesize of output 22 [2021-11-13 02:31:46,126 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:46,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:46,129 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:46,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:46,134 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:46,134 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:46,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,137 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:46,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,156 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:46,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:46,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,192 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:46,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:46,201 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:46,203 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:46,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:46,219 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:46,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:46,227 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:46,538 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:46,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:46,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 22 [2021-11-13 02:31:46,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129458880] [2021-11-13 02:31:46,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:46,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-13 02:31:46,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:46,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-13 02:31:46,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2021-11-13 02:31:46,539 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:46,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:46,814 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2021-11-13 02:31:46,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-13 02:31:46,815 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-13 02:31:46,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:46,815 INFO L225 Difference]: With dead ends: 82 [2021-11-13 02:31:46,815 INFO L226 Difference]: Without dead ends: 80 [2021-11-13 02:31:46,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 216 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=640, Invalid=1522, Unknown=0, NotChecked=0, Total=2162 [2021-11-13 02:31:46,817 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 60 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.06ms SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 97.12ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:46,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 13 Invalid, 243 Unknown, 0 Unchecked, 1.06ms Time], IncrementalHoareTripleChecker [73 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 97.12ms Time] [2021-11-13 02:31:46,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-13 02:31:46,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2021-11-13 02:31:46,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:46,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-11-13 02:31:46,827 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2021-11-13 02:31:46,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:46,827 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-11-13 02:31:46,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:46,827 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-11-13 02:31:46,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-13 02:31:46,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:46,828 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1] [2021-11-13 02:31:46,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:47,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable591,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:47,030 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:47,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:47,030 INFO L85 PathProgramCache]: Analyzing trace with hash -637376305, now seen corresponding path program 33 times [2021-11-13 02:31:47,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:47,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140692141] [2021-11-13 02:31:47,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:47,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:47,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:47,505 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:47,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:47,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140692141] [2021-11-13 02:31:47,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140692141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:47,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307980743] [2021-11-13 02:31:47,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:47,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:47,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:47,506 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:47,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-13 02:31:47,586 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:47,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:47,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 02:31:47,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:47,774 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:47,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:47,930 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:47,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307980743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:47,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911857121] [2021-11-13 02:31:47,932 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:47,932 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:47,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:47,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:47,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:47,935 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,936 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:47,937 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,937 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:47,938 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:47,938 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,938 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:47,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:47,941 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_40|], 10=[|v_#valid_41|]} [2021-11-13 02:31:47,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:47,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:47,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:47,949 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:47,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:47,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:47,951 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:47,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:47,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:47,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:47,960 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 23 treesize of output 22 [2021-11-13 02:31:47,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:47,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:47,964 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:47,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:47,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:47,969 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:47,969 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:47,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,972 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:47,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:47,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:47,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:47,990 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:47,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:47,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,012 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:48,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:48,018 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:48,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:48,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:48,035 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:48,037 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:48,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:48,407 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:48,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:48,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 38 [2021-11-13 02:31:48,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056896793] [2021-11-13 02:31:48,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:48,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-13 02:31:48,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:48,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-13 02:31:48,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1477, Unknown=0, NotChecked=0, Total=1892 [2021-11-13 02:31:48,409 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:48,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:48,849 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-11-13 02:31:48,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 02:31:48,849 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-13 02:31:48,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:48,852 INFO L225 Difference]: With dead ends: 132 [2021-11-13 02:31:48,852 INFO L226 Difference]: Without dead ends: 75 [2021-11-13 02:31:48,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=793, Invalid=2989, Unknown=0, NotChecked=0, Total=3782 [2021-11-13 02:31:48,853 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 135.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.34ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 163.73ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:48,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 128 Invalid, 257 Unknown, 0 Unchecked, 1.34ms Time], IncrementalHoareTripleChecker [4 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 163.73ms Time] [2021-11-13 02:31:48,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-13 02:31:48,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-13 02:31:48,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:48,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-11-13 02:31:48,864 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 73 [2021-11-13 02:31:48,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:48,865 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-11-13 02:31:48,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:48,865 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-11-13 02:31:48,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-13 02:31:48,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:48,866 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2021-11-13 02:31:48,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:49,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable610,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:49,068 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:49,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:49,069 INFO L85 PathProgramCache]: Analyzing trace with hash -2101570938, now seen corresponding path program 34 times [2021-11-13 02:31:49,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:49,069 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73602704] [2021-11-13 02:31:49,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:49,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:49,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:49,338 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 153 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:49,338 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:49,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73602704] [2021-11-13 02:31:49,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73602704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:49,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502474330] [2021-11-13 02:31:49,339 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:49,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:49,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:49,340 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:49,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-13 02:31:49,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:49,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-13 02:31:49,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:49,607 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:49,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:49,765 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:49,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502474330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:49,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1640997341] [2021-11-13 02:31:49,767 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:49,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:49,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:49,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:49,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:49,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,794 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:49,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,795 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:49,795 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:49,795 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,795 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:49,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:49,797 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_41|], 10=[|v_#valid_42|]} [2021-11-13 02:31:49,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:49,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:49,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:49,803 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:49,803 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:49,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:49,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:49,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:49,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:49,811 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 23 treesize of output 22 [2021-11-13 02:31:49,812 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,813 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:49,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:49,815 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:49,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,817 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,818 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,819 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:49,819 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:49,819 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:49,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,822 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:31:49,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,840 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:49,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:49,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,861 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:49,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:49,866 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:49,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:49,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:49,883 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:49,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:49,891 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:50,205 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:50,205 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:50,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2021-11-13 02:31:50,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798113283] [2021-11-13 02:31:50,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:50,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 02:31:50,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:50,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 02:31:50,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:31:50,207 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:50,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:50,531 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2021-11-13 02:31:50,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-13 02:31:50,532 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-13 02:31:50,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:50,533 INFO L225 Difference]: With dead ends: 86 [2021-11-13 02:31:50,533 INFO L226 Difference]: Without dead ends: 84 [2021-11-13 02:31:50,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 229 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=702, Invalid=1650, Unknown=0, NotChecked=0, Total=2352 [2021-11-13 02:31:50,533 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 81 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 100.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.12ms SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 119.25ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:50,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 19 Invalid, 291 Unknown, 0 Unchecked, 1.12ms Time], IncrementalHoareTripleChecker [94 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 119.25ms Time] [2021-11-13 02:31:50,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-13 02:31:50,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 78. [2021-11-13 02:31:50,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:50,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-11-13 02:31:50,540 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2021-11-13 02:31:50,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:50,540 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-11-13 02:31:50,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:50,541 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-11-13 02:31:50,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-13 02:31:50,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:50,541 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1] [2021-11-13 02:31:50,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-13 02:31:50,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable629,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:50,742 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:50,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:50,743 INFO L85 PathProgramCache]: Analyzing trace with hash -156719885, now seen corresponding path program 35 times [2021-11-13 02:31:50,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:50,743 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944522455] [2021-11-13 02:31:50,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:50,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:50,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:51,301 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:51,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:51,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944522455] [2021-11-13 02:31:51,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944522455] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:51,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442801864] [2021-11-13 02:31:51,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:51,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:51,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:51,303 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:51,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-13 02:31:51,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-13 02:31:51,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:51,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-13 02:31:51,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:51,619 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:51,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:51,789 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:51,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442801864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:51,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579799469] [2021-11-13 02:31:51,792 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:51,792 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:51,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:51,792 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:51,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:51,796 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,796 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:51,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:51,797 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:51,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:51,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:51,801 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_42|], 10=[|v_#valid_43|]} [2021-11-13 02:31:51,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:51,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:51,806 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:51,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:51,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:51,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,810 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:51,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:51,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:51,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:51,818 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 23 treesize of output 22 [2021-11-13 02:31:51,819 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:51,820 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:51,821 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:51,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:51,825 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:51,825 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:51,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:51,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:51,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:51,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,881 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:51,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:51,887 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:51,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:51,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:51,902 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:51,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:51,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:52,355 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:52,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:52,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 40 [2021-11-13 02:31:52,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128087833] [2021-11-13 02:31:52,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:52,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-13 02:31:52,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:52,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-13 02:31:52,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=1614, Unknown=0, NotChecked=0, Total=2070 [2021-11-13 02:31:52,357 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:52,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:52,853 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-11-13 02:31:52,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-13 02:31:52,853 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-13 02:31:52,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:52,854 INFO L225 Difference]: With dead ends: 139 [2021-11-13 02:31:52,854 INFO L226 Difference]: Without dead ends: 79 [2021-11-13 02:31:52,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=874, Invalid=3286, Unknown=0, NotChecked=0, Total=4160 [2021-11-13 02:31:52,855 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 129.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.35ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 159.37ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:52,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 160 Invalid, 317 Unknown, 0 Unchecked, 1.35ms Time], IncrementalHoareTripleChecker [6 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 159.37ms Time] [2021-11-13 02:31:52,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-13 02:31:52,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-13 02:31:52,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:52,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-11-13 02:31:52,865 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2021-11-13 02:31:52,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:52,865 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-11-13 02:31:52,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:52,866 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-11-13 02:31:52,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-13 02:31:52,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:52,866 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2021-11-13 02:31:52,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-13 02:31:53,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable648,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:53,072 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:53,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:53,073 INFO L85 PathProgramCache]: Analyzing trace with hash -29811926, now seen corresponding path program 36 times [2021-11-13 02:31:53,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:53,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864552270] [2021-11-13 02:31:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:53,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:53,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 171 proven. 514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:53,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:53,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864552270] [2021-11-13 02:31:53,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864552270] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:53,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078915391] [2021-11-13 02:31:53,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:53,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:53,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:53,323 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:53,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-13 02:31:53,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:53,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:53,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-13 02:31:53,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:53,587 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:53,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:53,764 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:53,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078915391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:53,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751380345] [2021-11-13 02:31:53,765 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:53,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:53,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:53,766 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:53,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:53,767 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,768 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:53,768 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:53,769 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:53,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:53,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:53,774 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_43|], 10=[|v_#valid_44|]} [2021-11-13 02:31:53,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:53,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:53,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:53,779 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:53,779 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:53,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,781 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:53,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:53,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:53,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:53,788 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 23 treesize of output 22 [2021-11-13 02:31:53,788 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:53,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:53,790 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:53,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,792 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:53,793 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:53,793 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:53,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,795 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:31:53,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:53,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:31:53,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,846 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:53,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:53,851 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:53,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:31:53,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:53,864 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:53,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:53,870 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:54,175 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:54,175 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:54,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 24 [2021-11-13 02:31:54,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530861279] [2021-11-13 02:31:54,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:54,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 02:31:54,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:54,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 02:31:54,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=610, Unknown=0, NotChecked=0, Total=870 [2021-11-13 02:31:54,177 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:54,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:54,590 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2021-11-13 02:31:54,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-13 02:31:54,590 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-13 02:31:54,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:54,591 INFO L225 Difference]: With dead ends: 90 [2021-11-13 02:31:54,591 INFO L226 Difference]: Without dead ends: 88 [2021-11-13 02:31:54,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 242 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1783, Unknown=0, NotChecked=0, Total=2550 [2021-11-13 02:31:54,592 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 66 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 114.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.47ms SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 148.19ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:54,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 13 Invalid, 263 Unknown, 0 Unchecked, 1.47ms Time], IncrementalHoareTripleChecker [81 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 148.19ms Time] [2021-11-13 02:31:54,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-13 02:31:54,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2021-11-13 02:31:54,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:54,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-11-13 02:31:54,603 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2021-11-13 02:31:54,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:54,604 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-11-13 02:31:54,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:54,604 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-11-13 02:31:54,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-13 02:31:54,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:54,605 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1] [2021-11-13 02:31:54,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:54,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable667 [2021-11-13 02:31:54,820 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:54,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:54,821 INFO L85 PathProgramCache]: Analyzing trace with hash 935963087, now seen corresponding path program 37 times [2021-11-13 02:31:54,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:54,821 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360464616] [2021-11-13 02:31:54,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:54,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:54,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:55,375 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:55,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:55,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360464616] [2021-11-13 02:31:55,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360464616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:55,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497427671] [2021-11-13 02:31:55,375 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:55,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:55,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:55,377 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:55,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-13 02:31:55,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:55,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-13 02:31:55,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:55,629 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:55,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:55,825 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:55,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497427671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:55,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212485802] [2021-11-13 02:31:55,827 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:55,827 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:55,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:55,827 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:55,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:55,830 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,831 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:55,831 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:55,832 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:55,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:55,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:55,836 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_44|], 10=[|v_#valid_45|]} [2021-11-13 02:31:55,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:55,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:55,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:55,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:55,844 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:55,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,846 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:55,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:55,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:55,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:55,856 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 23 treesize of output 22 [2021-11-13 02:31:55,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:55,858 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:55,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:55,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,860 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,861 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:55,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:55,862 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:55,862 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:31:55,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,883 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:55,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:55,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,912 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:55,914 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:55,918 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:55,920 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:55,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:55,940 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:55,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:55,946 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:56,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:56,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:56,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 42 [2021-11-13 02:31:56,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355809696] [2021-11-13 02:31:56,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:56,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-13 02:31:56,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:56,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-13 02:31:56,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=1757, Unknown=0, NotChecked=0, Total=2256 [2021-11-13 02:31:56,330 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:56,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:56,773 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-11-13 02:31:56,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-13 02:31:56,773 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-13 02:31:56,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:56,774 INFO L225 Difference]: With dead ends: 146 [2021-11-13 02:31:56,774 INFO L226 Difference]: Without dead ends: 83 [2021-11-13 02:31:56,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=959, Invalid=3597, Unknown=0, NotChecked=0, Total=4556 [2021-11-13 02:31:56,775 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 107.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.96ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.63ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:56,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 177 Invalid, 356 Unknown, 0 Unchecked, 0.96ms Time], IncrementalHoareTripleChecker [5 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 130.63ms Time] [2021-11-13 02:31:56,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-13 02:31:56,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-13 02:31:56,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:56,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-11-13 02:31:56,783 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 81 [2021-11-13 02:31:56,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:56,783 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-11-13 02:31:56,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:56,783 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-11-13 02:31:56,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-13 02:31:56,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:56,784 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2021-11-13 02:31:56,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:56,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable686 [2021-11-13 02:31:56,984 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:56,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:56,984 INFO L85 PathProgramCache]: Analyzing trace with hash 2033593478, now seen corresponding path program 38 times [2021-11-13 02:31:56,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:56,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351781961] [2021-11-13 02:31:56,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:56,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:57,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:57,299 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 190 proven. 571 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:57,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:57,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351781961] [2021-11-13 02:31:57,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351781961] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:57,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803166526] [2021-11-13 02:31:57,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:57,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:57,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:57,301 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:57,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-13 02:31:57,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-13 02:31:57,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:57,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-13 02:31:57,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:57,630 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:57,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:57,852 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:57,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803166526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:57,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137901596] [2021-11-13 02:31:57,853 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:31:57,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:57,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:31:57,853 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:31:57,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:31:57,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,855 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:57,856 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:31:57,856 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:31:57,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:31:57,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:31:57,862 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_45|], 10=[|v_#valid_46|]} [2021-11-13 02:31:57,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:57,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:31:57,874 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:57,875 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:31:57,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:57,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:57,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:57,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:57,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:31:57,884 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 23 treesize of output 22 [2021-11-13 02:31:57,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:57,886 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:31:57,887 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:31:57,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,888 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:31:57,890 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:31:57,890 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:31:57,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:31:57,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,926 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:31:57,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:31:57,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,952 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:31:57,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:31:57,956 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:31:57,958 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:31:57,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:31:57,968 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:31:57,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:31:57,972 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:31:58,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:31:58,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:58,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 25 [2021-11-13 02:31:58,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940269796] [2021-11-13 02:31:58,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:58,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 02:31:58,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:58,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 02:31:58,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=648, Unknown=0, NotChecked=0, Total=930 [2021-11-13 02:31:58,282 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:58,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:58,627 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2021-11-13 02:31:58,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 02:31:58,627 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-13 02:31:58,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:58,628 INFO L225 Difference]: With dead ends: 94 [2021-11-13 02:31:58,628 INFO L226 Difference]: Without dead ends: 92 [2021-11-13 02:31:58,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=835, Invalid=1921, Unknown=0, NotChecked=0, Total=2756 [2021-11-13 02:31:58,628 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 50 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 95.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.80ms SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 120.46ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:58,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 20 Invalid, 285 Unknown, 0 Unchecked, 0.80ms Time], IncrementalHoareTripleChecker [65 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 120.46ms Time] [2021-11-13 02:31:58,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-13 02:31:58,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 86. [2021-11-13 02:31:58,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:58,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-11-13 02:31:58,637 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2021-11-13 02:31:58,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:58,637 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-11-13 02:31:58,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:31:58,637 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-11-13 02:31:58,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-13 02:31:58,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:58,638 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1] [2021-11-13 02:31:58,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:58,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable705,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:58,838 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:58,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:58,839 INFO L85 PathProgramCache]: Analyzing trace with hash -2020553997, now seen corresponding path program 39 times [2021-11-13 02:31:58,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:58,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996539685] [2021-11-13 02:31:58,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:58,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:58,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:59,515 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:59,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:59,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996539685] [2021-11-13 02:31:59,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996539685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:59,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276171903] [2021-11-13 02:31:59,516 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:59,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:59,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:59,517 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:59,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-13 02:31:59,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:59,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:59,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 02:31:59,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:59,843 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:31:59,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:00,001 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:00,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276171903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:00,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593753628] [2021-11-13 02:32:00,002 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:00,003 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:00,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:00,003 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:00,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:00,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,006 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:00,020 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:00,021 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:00,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:00,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:00,026 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_46|], 10=[|v_#valid_47|]} [2021-11-13 02:32:00,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:00,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:00,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:00,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:00,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:00,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:00,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:00,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:00,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:00,044 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 23 treesize of output 22 [2021-11-13 02:32:00,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:00,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:00,046 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:00,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,048 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:00,049 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:00,049 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:00,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:32:00,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:00,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:32:00,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,087 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:00,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:00,094 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:00,095 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:00,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:00,107 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:00,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:00,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:00,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:00,474 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:00,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 44 [2021-11-13 02:32:00,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221010524] [2021-11-13 02:32:00,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:00,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 02:32:00,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:00,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 02:32:00,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2021-11-13 02:32:00,476 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:00,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:00,957 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-11-13 02:32:00,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-13 02:32:00,957 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-13 02:32:00,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:00,958 INFO L225 Difference]: With dead ends: 153 [2021-11-13 02:32:00,958 INFO L226 Difference]: Without dead ends: 87 [2021-11-13 02:32:00,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1048, Invalid=3922, Unknown=0, NotChecked=0, Total=4970 [2021-11-13 02:32:00,959 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 3 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 110.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.92ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 138.78ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:00,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 172 Invalid, 349 Unknown, 0 Unchecked, 0.92ms Time], IncrementalHoareTripleChecker [6 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 138.78ms Time] [2021-11-13 02:32:00,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-13 02:32:00,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-11-13 02:32:00,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:00,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-11-13 02:32:00,968 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 85 [2021-11-13 02:32:00,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:00,969 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-11-13 02:32:00,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:00,969 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-11-13 02:32:00,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-13 02:32:00,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:00,969 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2021-11-13 02:32:00,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:01,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable724,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:01,170 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:01,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:01,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1694439978, now seen corresponding path program 40 times [2021-11-13 02:32:01,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:01,170 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243682354] [2021-11-13 02:32:01,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:01,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:01,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:01,488 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 210 proven. 631 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:01,488 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:01,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243682354] [2021-11-13 02:32:01,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243682354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:01,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860746990] [2021-11-13 02:32:01,488 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:32:01,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:01,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:01,489 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:01,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-13 02:32:01,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:01,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-13 02:32:01,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:01,751 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:01,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:01,936 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:01,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860746990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:01,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1682121077] [2021-11-13 02:32:01,937 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:01,937 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:01,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:01,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:01,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:01,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,942 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:01,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:01,943 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:01,943 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:01,944 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:01,945 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_47|], 10=[|v_#valid_48|]} [2021-11-13 02:32:01,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:01,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:01,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:01,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:01,951 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:01,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:01,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:01,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:01,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:01,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:01,961 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 23 treesize of output 22 [2021-11-13 02:32:01,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:01,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:01,963 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:01,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:01,965 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,966 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,966 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:01,967 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:01,967 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:01,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:32:01,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:01,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:01,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:01,987 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:01,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:32:01,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,006 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:02,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:02,010 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:02,012 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:32:02,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:02,023 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:02,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:02,027 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:02,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:02,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:02,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 26 [2021-11-13 02:32:02,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341189281] [2021-11-13 02:32:02,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:02,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-13 02:32:02,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:02,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-13 02:32:02,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=687, Unknown=0, NotChecked=0, Total=992 [2021-11-13 02:32:02,350 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:02,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:02,724 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-11-13 02:32:02,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-13 02:32:02,725 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-13 02:32:02,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:02,725 INFO L225 Difference]: With dead ends: 98 [2021-11-13 02:32:02,725 INFO L226 Difference]: Without dead ends: 96 [2021-11-13 02:32:02,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 268 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=906, Invalid=2064, Unknown=0, NotChecked=0, Total=2970 [2021-11-13 02:32:02,726 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 71 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 120.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.79ms SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 141.33ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:02,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 18 Invalid, 316 Unknown, 0 Unchecked, 0.79ms Time], IncrementalHoareTripleChecker [88 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 141.33ms Time] [2021-11-13 02:32:02,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-13 02:32:02,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-13 02:32:02,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:02,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-11-13 02:32:02,739 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2021-11-13 02:32:02,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:02,740 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-11-13 02:32:02,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:02,740 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-11-13 02:32:02,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-13 02:32:02,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:02,741 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1] [2021-11-13 02:32:02,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:02,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable743,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:02,964 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:02,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:02,964 INFO L85 PathProgramCache]: Analyzing trace with hash 315574991, now seen corresponding path program 41 times [2021-11-13 02:32:02,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:02,965 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418958284] [2021-11-13 02:32:02,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:02,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:02,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:03,587 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:03,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:03,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418958284] [2021-11-13 02:32:03,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418958284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:03,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191926242] [2021-11-13 02:32:03,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:32:03,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:03,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:03,588 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:03,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-13 02:32:03,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-13 02:32:03,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:03,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-13 02:32:03,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:03,934 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:03,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:04,145 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:04,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191926242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:04,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [760100273] [2021-11-13 02:32:04,147 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:04,147 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:04,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:04,148 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:04,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:04,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,151 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:04,151 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:04,152 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:04,153 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,153 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:04,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:04,156 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_48|], 10=[|v_#valid_49|]} [2021-11-13 02:32:04,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:04,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:04,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:04,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:04,164 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:04,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,167 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:04,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:04,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:04,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:04,175 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 23 treesize of output 22 [2021-11-13 02:32:04,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:04,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:04,179 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:04,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,181 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,182 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:04,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:04,183 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:04,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,187 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:32:04,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,208 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:04,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:04,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,237 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:04,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:04,253 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:04,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:04,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:04,266 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:04,267 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:04,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:04,636 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:04,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:04,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 46 [2021-11-13 02:32:04,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926077598] [2021-11-13 02:32:04,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:04,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-13 02:32:04,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:04,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-13 02:32:04,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=591, Invalid=2061, Unknown=0, NotChecked=0, Total=2652 [2021-11-13 02:32:04,638 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:05,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:05,274 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2021-11-13 02:32:05,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-13 02:32:05,274 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-13 02:32:05,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:05,275 INFO L225 Difference]: With dead ends: 160 [2021-11-13 02:32:05,275 INFO L226 Difference]: Without dead ends: 91 [2021-11-13 02:32:05,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1141, Invalid=4261, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 02:32:05,276 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 148.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.27ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 179.43ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:05,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 232 Invalid, 465 Unknown, 0 Unchecked, 1.27ms Time], IncrementalHoareTripleChecker [6 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 179.43ms Time] [2021-11-13 02:32:05,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-13 02:32:05,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-13 02:32:05,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:05,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-11-13 02:32:05,291 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2021-11-13 02:32:05,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:05,291 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-11-13 02:32:05,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:05,292 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-11-13 02:32:05,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 02:32:05,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:05,292 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2021-11-13 02:32:05,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-13 02:32:05,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable762 [2021-11-13 02:32:05,509 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:05,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:05,510 INFO L85 PathProgramCache]: Analyzing trace with hash -444258682, now seen corresponding path program 42 times [2021-11-13 02:32:05,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:05,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744797476] [2021-11-13 02:32:05,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:05,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:05,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:05,858 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 231 proven. 694 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:05,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:05,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744797476] [2021-11-13 02:32:05,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744797476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:05,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238953456] [2021-11-13 02:32:05,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:32:05,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:05,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:05,860 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:05,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-13 02:32:05,947 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:32:05,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:05,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-13 02:32:05,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:06,211 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:06,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:06,411 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:06,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238953456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:06,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631468671] [2021-11-13 02:32:06,412 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:06,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:06,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:06,413 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:06,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:06,415 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,415 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:06,416 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:06,425 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:06,425 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:06,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:06,428 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_49|], 10=[|v_#valid_50|]} [2021-11-13 02:32:06,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:06,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:06,435 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,435 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:06,436 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,436 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:06,436 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:06,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,438 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:06,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:06,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:06,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:06,447 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 23 treesize of output 22 [2021-11-13 02:32:06,447 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:06,449 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:06,450 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:06,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,452 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:06,454 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:06,454 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:06,456 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:32:06,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:06,480 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:32:06,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,504 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:06,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:06,510 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:06,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:06,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:06,523 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:06,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:06,527 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:06,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:06,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:06,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 27 [2021-11-13 02:32:06,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667498537] [2021-11-13 02:32:06,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:06,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 02:32:06,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:06,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 02:32:06,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=727, Unknown=0, NotChecked=0, Total=1056 [2021-11-13 02:32:06,841 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:07,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:07,233 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2021-11-13 02:32:07,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-13 02:32:07,233 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-13 02:32:07,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:07,234 INFO L225 Difference]: With dead ends: 102 [2021-11-13 02:32:07,234 INFO L226 Difference]: Without dead ends: 100 [2021-11-13 02:32:07,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=980, Invalid=2212, Unknown=0, NotChecked=0, Total=3192 [2021-11-13 02:32:07,234 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 75 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 118.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.79ms SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 141.05ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:07,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 16 Invalid, 339 Unknown, 0 Unchecked, 0.79ms Time], IncrementalHoareTripleChecker [92 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 141.05ms Time] [2021-11-13 02:32:07,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-13 02:32:07,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2021-11-13 02:32:07,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:07,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-11-13 02:32:07,246 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-11-13 02:32:07,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:07,246 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-11-13 02:32:07,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:07,247 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-11-13 02:32:07,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-13 02:32:07,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:07,247 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1] [2021-11-13 02:32:07,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:07,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable781,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:07,456 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:07,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:07,456 INFO L85 PathProgramCache]: Analyzing trace with hash -2111336205, now seen corresponding path program 43 times [2021-11-13 02:32:07,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:07,457 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310636689] [2021-11-13 02:32:07,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:07,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:07,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:08,085 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:08,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:08,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310636689] [2021-11-13 02:32:08,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310636689] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:08,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292538511] [2021-11-13 02:32:08,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:32:08,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:08,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:08,086 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:08,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-13 02:32:08,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:08,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-13 02:32:08,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:08,334 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:08,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:08,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292538511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:08,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2035848211] [2021-11-13 02:32:08,503 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:08,503 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:08,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:08,503 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:08,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:08,509 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,509 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:08,510 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,510 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:08,510 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:08,514 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:08,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:08,516 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_50|], 10=[|v_#valid_51|]} [2021-11-13 02:32:08,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:08,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:08,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:08,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,525 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:08,525 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:08,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:08,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:08,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:08,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:08,534 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 23 treesize of output 22 [2021-11-13 02:32:08,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:08,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:08,536 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:08,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,539 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:08,540 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:08,540 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:08,541 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,543 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:32:08,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:08,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:08,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,577 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:08,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:08,581 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:08,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:08,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:08,595 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:08,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:08,604 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:08,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:08,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:08,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 48 [2021-11-13 02:32:08,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637599006] [2021-11-13 02:32:08,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:08,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-13 02:32:08,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:09,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-13 02:32:09,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=2222, Unknown=0, NotChecked=0, Total=2862 [2021-11-13 02:32:09,000 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:09,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:09,613 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-11-13 02:32:09,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-13 02:32:09,613 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-13 02:32:09,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:09,614 INFO L225 Difference]: With dead ends: 167 [2021-11-13 02:32:09,614 INFO L226 Difference]: Without dead ends: 95 [2021-11-13 02:32:09,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1238, Invalid=4614, Unknown=0, NotChecked=0, Total=5852 [2021-11-13 02:32:09,615 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 3 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 95.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.89ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 127.55ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:09,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 122 Invalid, 251 Unknown, 0 Unchecked, 0.89ms Time], IncrementalHoareTripleChecker [6 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 127.55ms Time] [2021-11-13 02:32:09,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-13 02:32:09,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-13 02:32:09,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:09,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-11-13 02:32:09,631 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 93 [2021-11-13 02:32:09,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:09,631 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-11-13 02:32:09,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:09,632 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-11-13 02:32:09,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-13 02:32:09,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:09,632 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1] [2021-11-13 02:32:09,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:09,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable800 [2021-11-13 02:32:09,858 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:09,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:09,858 INFO L85 PathProgramCache]: Analyzing trace with hash 176863530, now seen corresponding path program 44 times [2021-11-13 02:32:09,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:09,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802396175] [2021-11-13 02:32:09,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:09,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:09,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:10,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 253 proven. 760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:10,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:10,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802396175] [2021-11-13 02:32:10,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802396175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:10,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7482405] [2021-11-13 02:32:10,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:32:10,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:10,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:10,173 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:10,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-13 02:32:10,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-13 02:32:10,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:10,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-13 02:32:10,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:10,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:10,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:10,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:10,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7482405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:10,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [652810839] [2021-11-13 02:32:10,673 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:10,673 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:10,674 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:10,674 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:10,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:10,676 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,677 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:10,677 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,678 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:10,678 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:10,678 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:10,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:10,681 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_51|], 10=[|v_#valid_52|]} [2021-11-13 02:32:10,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:10,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:10,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:10,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:10,688 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:10,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,691 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:10,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:10,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:10,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:10,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:32:10,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:10,701 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:10,702 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:10,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,704 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:10,706 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:10,706 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:10,707 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,709 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:32:10,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:10,734 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:10,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,758 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:10,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:10,763 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:10,765 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:32:10,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:10,778 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:10,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:10,801 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:11,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:11,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:11,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 28 [2021-11-13 02:32:11,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867404354] [2021-11-13 02:32:11,209 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:11,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 02:32:11,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:11,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 02:32:11,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=768, Unknown=0, NotChecked=0, Total=1122 [2021-11-13 02:32:11,210 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:11,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:11,628 INFO L93 Difference]: Finished difference Result 106 states and 107 transitions. [2021-11-13 02:32:11,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-13 02:32:11,628 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-13 02:32:11,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:11,629 INFO L225 Difference]: With dead ends: 106 [2021-11-13 02:32:11,629 INFO L226 Difference]: Without dead ends: 104 [2021-11-13 02:32:11,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 294 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1057, Invalid=2365, Unknown=0, NotChecked=0, Total=3422 [2021-11-13 02:32:11,630 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 78 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 121.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.94ms SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 145.47ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:11,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 17 Invalid, 320 Unknown, 0 Unchecked, 0.94ms Time], IncrementalHoareTripleChecker [97 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 145.47ms Time] [2021-11-13 02:32:11,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-13 02:32:11,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 98. [2021-11-13 02:32:11,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:11,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-11-13 02:32:11,641 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2021-11-13 02:32:11,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:11,641 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-11-13 02:32:11,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:11,641 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-11-13 02:32:11,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-13 02:32:11,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:11,642 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1] [2021-11-13 02:32:11,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-13 02:32:11,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable819,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:11,852 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:11,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:11,852 INFO L85 PathProgramCache]: Analyzing trace with hash -978629681, now seen corresponding path program 45 times [2021-11-13 02:32:11,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:11,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416540279] [2021-11-13 02:32:11,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:11,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:11,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:12,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:12,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:12,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416540279] [2021-11-13 02:32:12,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416540279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:12,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564784920] [2021-11-13 02:32:12,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:32:12,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:12,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:12,600 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:12,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-13 02:32:12,669 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:32:12,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:12,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-13 02:32:12,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:12,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:12,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:13,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:13,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564784920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:13,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921149520] [2021-11-13 02:32:13,193 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:13,194 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:13,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:13,194 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:13,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:13,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,196 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:13,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:13,202 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:13,202 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:13,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:13,204 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_52|], 10=[|v_#valid_53|]} [2021-11-13 02:32:13,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:13,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:13,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:13,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:13,210 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:13,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:13,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:13,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:13,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:13,218 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 23 treesize of output 22 [2021-11-13 02:32:13,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:13,220 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:13,221 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:13,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,223 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:13,224 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:13,224 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:13,225 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,226 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:32:13,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:13,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:13,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,290 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:13,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:13,296 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:13,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:13,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:13,312 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:13,314 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:13,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:13,697 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:13,698 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:13,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 50 [2021-11-13 02:32:13,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308850160] [2021-11-13 02:32:13,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:13,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 02:32:13,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:13,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 02:32:13,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=2389, Unknown=0, NotChecked=0, Total=3080 [2021-11-13 02:32:13,699 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:14,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:14,227 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2021-11-13 02:32:14,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-13 02:32:14,227 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-13 02:32:14,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:14,228 INFO L225 Difference]: With dead ends: 174 [2021-11-13 02:32:14,228 INFO L226 Difference]: Without dead ends: 99 [2021-11-13 02:32:14,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1339, Invalid=4981, Unknown=0, NotChecked=0, Total=6320 [2021-11-13 02:32:14,229 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 93.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.81ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 112.35ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:14,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 151 Invalid, 310 Unknown, 0 Unchecked, 0.81ms Time], IncrementalHoareTripleChecker [6 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 112.35ms Time] [2021-11-13 02:32:14,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-13 02:32:14,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-13 02:32:14,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:14,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-11-13 02:32:14,238 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 97 [2021-11-13 02:32:14,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:14,239 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-11-13 02:32:14,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:14,239 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-11-13 02:32:14,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-13 02:32:14,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:14,240 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1] [2021-11-13 02:32:14,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-13 02:32:14,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable838,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:14,452 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:14,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:14,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1690206074, now seen corresponding path program 46 times [2021-11-13 02:32:14,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:14,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619847626] [2021-11-13 02:32:14,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:14,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:14,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:14,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 276 proven. 829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:14,837 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:14,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619847626] [2021-11-13 02:32:14,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619847626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:14,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71327555] [2021-11-13 02:32:14,838 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:32:14,838 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:14,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:14,839 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:14,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-13 02:32:14,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:14,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-13 02:32:14,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:15,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:15,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:15,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:15,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [71327555] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:15,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1380532102] [2021-11-13 02:32:15,303 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:15,303 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:15,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:15,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:15,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:15,317 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,318 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:15,318 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,319 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:15,319 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:15,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,319 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:15,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:15,322 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_53|], 10=[|v_#valid_54|]} [2021-11-13 02:32:15,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:15,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:15,328 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:15,329 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:15,329 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:15,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,332 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:15,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:15,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:15,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:15,338 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 23 treesize of output 22 [2021-11-13 02:32:15,339 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,340 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:15,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,340 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:15,340 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:15,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,342 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,342 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:15,343 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:15,343 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:15,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,345 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:32:15,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,359 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:15,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:15,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,377 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:15,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:15,381 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:15,382 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:32:15,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:15,391 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:15,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:15,395 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:15,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:15,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:15,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 29 [2021-11-13 02:32:15,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789904594] [2021-11-13 02:32:15,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:15,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-13 02:32:15,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:15,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-13 02:32:15,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=810, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 02:32:15,725 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:16,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:16,164 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2021-11-13 02:32:16,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-13 02:32:16,165 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-13 02:32:16,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:16,165 INFO L225 Difference]: With dead ends: 110 [2021-11-13 02:32:16,165 INFO L226 Difference]: Without dead ends: 108 [2021-11-13 02:32:16,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 307 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1137, Invalid=2523, Unknown=0, NotChecked=0, Total=3660 [2021-11-13 02:32:16,166 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 81 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 133.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.97ms SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 158.82ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:16,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 18 Invalid, 361 Unknown, 0 Unchecked, 0.97ms Time], IncrementalHoareTripleChecker [100 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 158.82ms Time] [2021-11-13 02:32:16,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-13 02:32:16,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 102. [2021-11-13 02:32:16,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:16,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-11-13 02:32:16,178 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2021-11-13 02:32:16,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:16,178 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-11-13 02:32:16,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:16,179 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-11-13 02:32:16,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-13 02:32:16,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:16,179 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1] [2021-11-13 02:32:16,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:16,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable857,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:16,380 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:16,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:16,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1272248051, now seen corresponding path program 47 times [2021-11-13 02:32:16,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:16,380 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178536229] [2021-11-13 02:32:16,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:16,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:16,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:17,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:17,155 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:17,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178536229] [2021-11-13 02:32:17,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178536229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:17,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443542581] [2021-11-13 02:32:17,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:32:17,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:17,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:17,157 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:17,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-13 02:32:17,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-13 02:32:17,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:17,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 02:32:17,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:17,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:17,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:17,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:17,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443542581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:17,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [288332343] [2021-11-13 02:32:17,730 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:17,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:17,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:17,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:17,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:17,733 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,733 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:17,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,734 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:17,735 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:17,735 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:17,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:17,738 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_54|], 10=[|v_#valid_55|]} [2021-11-13 02:32:17,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:17,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:17,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:17,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:17,750 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:17,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,751 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:17,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:17,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:17,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:17,758 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 23 treesize of output 22 [2021-11-13 02:32:17,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:17,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,761 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:17,761 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:17,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:17,764 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:17,764 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:17,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,766 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:32:17,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:17,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:17,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,802 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:17,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:17,808 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:17,810 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:32:17,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:17,821 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:17,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:17,825 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:18,211 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:18,212 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:18,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2021-11-13 02:32:18,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47921013] [2021-11-13 02:32:18,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:18,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-13 02:32:18,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:18,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-13 02:32:18,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=744, Invalid=2562, Unknown=0, NotChecked=0, Total=3306 [2021-11-13 02:32:18,214 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:18,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:18,886 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2021-11-13 02:32:18,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-13 02:32:18,886 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-13 02:32:18,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:18,887 INFO L225 Difference]: With dead ends: 181 [2021-11-13 02:32:18,887 INFO L226 Difference]: Without dead ends: 103 [2021-11-13 02:32:18,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1273 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1444, Invalid=5362, Unknown=0, NotChecked=0, Total=6806 [2021-11-13 02:32:18,887 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 145.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.28ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 179.35ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:18,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 190 Invalid, 395 Unknown, 0 Unchecked, 1.28ms Time], IncrementalHoareTripleChecker [6 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 179.35ms Time] [2021-11-13 02:32:18,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-13 02:32:18,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-13 02:32:18,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:18,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-11-13 02:32:18,903 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2021-11-13 02:32:18,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:18,904 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-11-13 02:32:18,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:18,904 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-11-13 02:32:18,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-13 02:32:18,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:18,905 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1] [2021-11-13 02:32:18,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:19,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable876 [2021-11-13 02:32:19,124 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:19,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:19,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1296300074, now seen corresponding path program 48 times [2021-11-13 02:32:19,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:19,125 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794056701] [2021-11-13 02:32:19,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:19,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:19,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:19,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 300 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:19,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:19,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794056701] [2021-11-13 02:32:19,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794056701] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:19,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353220350] [2021-11-13 02:32:19,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:32:19,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:19,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:19,504 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:19,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-13 02:32:19,584 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:32:19,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:19,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-13 02:32:19,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:19,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:19,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:20,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:20,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353220350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:20,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1376831738] [2021-11-13 02:32:20,017 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:20,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:20,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:20,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:20,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:20,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,024 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:20,024 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:20,025 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:20,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:20,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:20,028 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_55|], 10=[|v_#valid_56|]} [2021-11-13 02:32:20,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:20,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:20,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:20,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:20,034 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:20,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,036 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:20,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:20,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:20,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:20,045 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 23 treesize of output 22 [2021-11-13 02:32:20,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:20,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:20,047 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:20,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,049 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:20,050 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:20,050 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:20,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,053 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:32:20,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:20,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:20,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,088 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:20,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:20,093 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:20,095 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:20,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:20,110 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:20,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:20,114 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:20,452 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:20,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:20,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 30 [2021-11-13 02:32:20,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522291368] [2021-11-13 02:32:20,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:20,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-13 02:32:20,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:20,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-13 02:32:20,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=853, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 02:32:20,454 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:20,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:20,893 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2021-11-13 02:32:20,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-13 02:32:20,893 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-13 02:32:20,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:20,894 INFO L225 Difference]: With dead ends: 114 [2021-11-13 02:32:20,894 INFO L226 Difference]: Without dead ends: 112 [2021-11-13 02:32:20,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 320 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1220, Invalid=2686, Unknown=0, NotChecked=0, Total=3906 [2021-11-13 02:32:20,895 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 86 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 121.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.03ms SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 146.55ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:20,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 16 Invalid, 378 Unknown, 0 Unchecked, 1.03ms Time], IncrementalHoareTripleChecker [104 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 146.55ms Time] [2021-11-13 02:32:20,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-13 02:32:20,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2021-11-13 02:32:20,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:20,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-11-13 02:32:20,910 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 102 [2021-11-13 02:32:20,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:20,910 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-11-13 02:32:20,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:20,910 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-11-13 02:32:20,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-13 02:32:20,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:20,911 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1] [2021-11-13 02:32:20,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:21,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable895 [2021-11-13 02:32:21,111 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:21,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:21,111 INFO L85 PathProgramCache]: Analyzing trace with hash 2029366479, now seen corresponding path program 49 times [2021-11-13 02:32:21,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:21,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823156813] [2021-11-13 02:32:21,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:21,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:21,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:22,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:22,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:22,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823156813] [2021-11-13 02:32:22,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823156813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:22,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022191731] [2021-11-13 02:32:22,048 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:32:22,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:22,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:22,050 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:22,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-13 02:32:22,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:22,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 02:32:22,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:22,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:22,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:22,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:22,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022191731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:22,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584310309] [2021-11-13 02:32:22,559 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:22,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:22,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:22,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:22,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:22,562 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,562 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:22,563 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:22,563 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:22,564 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,564 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:22,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:22,567 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_56|], 10=[|v_#valid_57|]} [2021-11-13 02:32:22,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:22,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:22,572 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:22,573 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:22,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:22,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:22,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:22,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:22,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:22,583 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 23 treesize of output 22 [2021-11-13 02:32:22,584 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:22,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:32:22,586 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:22,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,589 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:32:22,590 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:32:22,590 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:32:22,591 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,593 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:32:22,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,613 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:22,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:32:22,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,642 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:32:22,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:32:22,648 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:32:22,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:32:22,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:22,663 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:32:22,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:32:22,673 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:32:23,130 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:32:23,130 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:32:23,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 54 [2021-11-13 02:32:23,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966152734] [2021-11-13 02:32:23,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:32:23,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-13 02:32:23,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:32:23,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-13 02:32:23,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=799, Invalid=2741, Unknown=0, NotChecked=0, Total=3540 [2021-11-13 02:32:23,132 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:23,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:32:23,758 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2021-11-13 02:32:23,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-13 02:32:23,758 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-11-13 02:32:23,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:32:23,760 INFO L225 Difference]: With dead ends: 188 [2021-11-13 02:32:23,760 INFO L226 Difference]: Without dead ends: 107 [2021-11-13 02:32:23,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1363 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1553, Invalid=5757, Unknown=0, NotChecked=0, Total=7310 [2021-11-13 02:32:23,761 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 3 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 118.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.98ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 142.19ms IncrementalHoareTripleChecker+Time [2021-11-13 02:32:23,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 200 Invalid, 408 Unknown, 0 Unchecked, 0.98ms Time], IncrementalHoareTripleChecker [3 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 142.19ms Time] [2021-11-13 02:32:23,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-13 02:32:23,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-13 02:32:23,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:23,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-13 02:32:23,778 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 105 [2021-11-13 02:32:23,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:32:23,779 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-13 02:32:23,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:32:23,779 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-13 02:32:23,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-13 02:32:23,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:32:23,780 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1] [2021-11-13 02:32:23,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-13 02:32:24,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable914,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:24,004 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:32:24,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:32:24,004 INFO L85 PathProgramCache]: Analyzing trace with hash 1006844550, now seen corresponding path program 50 times [2021-11-13 02:32:24,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:32:24,004 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277819354] [2021-11-13 02:32:24,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:32:24,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:32:24,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:32:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 325 proven. 976 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:24,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:32:24,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277819354] [2021-11-13 02:32:24,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277819354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:32:24,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299240819] [2021-11-13 02:32:24,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:32:24,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:32:24,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:32:24,464 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:32:24,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-13 02:32:24,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-13 02:32:24,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:32:24,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-13 02:32:24,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:24,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:24,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:32:25,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:32:25,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299240819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:32:25,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614966167] [2021-11-13 02:32:25,079 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:32:25,079 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:32:25,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:32:25,079 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:32:25,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:32:25,081 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,081 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:25,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,082 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:32:25,082 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:32:25,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,082 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:32:25,083 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:32:25,084 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_57|], 10=[|v_#valid_58|]} [2021-11-13 02:32:25,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:25,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:32:25,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:25,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:32:25,090 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:32:25,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:32:25,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:32:25,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:25,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:25,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:25,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:32:25,098 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 23 treesize of output 22 WARNING: YOUR LOGFILE WAS TOO LONG, SOME LINES IN THE MIDDLE WERE REMOVED. [2021-11-13 02:35:28,759 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:28,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:28,763 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:28,764 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:35:28,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:28,780 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:28,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:28,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:29,329 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:29,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:29,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 104 [2021-11-13 02:35:29,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892068530] [2021-11-13 02:35:29,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:29,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-13 02:35:29,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:29,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-13 02:35:29,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2824, Invalid=9166, Unknown=0, NotChecked=0, Total=11990 [2021-11-13 02:35:29,332 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:31,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:31,321 INFO L93 Difference]: Finished difference Result 363 states and 365 transitions. [2021-11-13 02:35:31,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-13 02:35:31,321 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 205 [2021-11-13 02:35:31,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:31,322 INFO L225 Difference]: With dead ends: 363 [2021-11-13 02:35:31,323 INFO L226 Difference]: Without dead ends: 207 [2021-11-13 02:35:31,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 767 GetRequests, 608 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4588 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5578, Invalid=20182, Unknown=0, NotChecked=0, Total=25760 [2021-11-13 02:35:31,325 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 3 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 1005 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 276.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.12ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 349.92ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:31,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 491 Invalid, 1012 Unknown, 0 Unchecked, 2.12ms Time], IncrementalHoareTripleChecker [7 Valid, 1005 Invalid, 0 Unknown, 0 Unchecked, 349.92ms Time] [2021-11-13 02:35:31,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-13 02:35:31,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-11-13 02:35:31,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0097087378640777) internal successors, (208), 206 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:31,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2021-11-13 02:35:31,361 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 205 [2021-11-13 02:35:31,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:31,361 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2021-11-13 02:35:31,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:31,361 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2021-11-13 02:35:31,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-13 02:35:31,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:31,362 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 50, 50, 1, 1, 1, 1] [2021-11-13 02:35:31,382 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-13 02:35:31,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1864 [2021-11-13 02:35:31,563 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:31,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:31,563 INFO L85 PathProgramCache]: Analyzing trace with hash -759428310, now seen corresponding path program 100 times [2021-11-13 02:35:31,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:31,563 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450371540] [2021-11-13 02:35:31,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:31,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:31,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:32,679 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1275 proven. 3826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:32,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:32,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450371540] [2021-11-13 02:35:32,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450371540] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:32,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985038094] [2021-11-13 02:35:32,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:35:32,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:32,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:32,680 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:32,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-13 02:35:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:32,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 797 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-13 02:35:32,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:33,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:33,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:33,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:33,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985038094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:33,575 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122173441] [2021-11-13 02:35:33,576 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:35:33,576 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:33,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:35:33,576 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:35:33,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:35:33,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,578 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:33,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:35:33,579 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:33,579 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:35:33,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:35:33,581 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_107|], 10=[|v_#valid_108|]} [2021-11-13 02:35:33,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:33,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:35:33,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:33,586 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:33,586 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:33,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:33,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:33,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:33,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:33,595 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 23 treesize of output 22 [2021-11-13 02:35:33,595 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:33,596 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:33,597 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:33,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,598 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:35:33,599 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:35:33,599 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:35:33,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:35:33,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,614 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:33,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:35:33,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,633 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:33,634 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:33,637 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:33,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:35:33,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:33,647 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:33,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:33,652 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:34,053 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:34,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:34,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 56 [2021-11-13 02:35:34,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422111084] [2021-11-13 02:35:34,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:34,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-13 02:35:34,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:34,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-13 02:35:34,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1460, Invalid=2322, Unknown=0, NotChecked=0, Total=3782 [2021-11-13 02:35:34,055 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:35,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:35,177 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2021-11-13 02:35:35,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-13 02:35:35,178 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 206 [2021-11-13 02:35:35,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:35,178 INFO L225 Difference]: With dead ends: 218 [2021-11-13 02:35:35,179 INFO L226 Difference]: Without dead ends: 216 [2021-11-13 02:35:35,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 658 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4431, Invalid=8679, Unknown=0, NotChecked=0, Total=13110 [2021-11-13 02:35:35,180 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 214 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 259 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 237.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.60ms SdHoareTripleChecker+Time, 259 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 287.51ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:35,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 21 Invalid, 776 Unknown, 0 Unchecked, 1.60ms Time], IncrementalHoareTripleChecker [259 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 287.51ms Time] [2021-11-13 02:35:35,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-13 02:35:35,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 210. [2021-11-13 02:35:35,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:35,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2021-11-13 02:35:35,214 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 206 [2021-11-13 02:35:35,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:35,214 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2021-11-13 02:35:35,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:35,214 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2021-11-13 02:35:35,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-13 02:35:35,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:35,215 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 1, 1, 1, 1] [2021-11-13 02:35:35,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:35,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1883 [2021-11-13 02:35:35,416 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:35,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:35,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1763752399, now seen corresponding path program 101 times [2021-11-13 02:35:35,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:35,416 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172896963] [2021-11-13 02:35:35,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:35,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:35,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:38,148 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:38,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:38,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172896963] [2021-11-13 02:35:38,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172896963] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:38,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540290663] [2021-11-13 02:35:38,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:35:38,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:38,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:38,149 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:38,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-13 02:35:38,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-13 02:35:38,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:38,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 807 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-13 02:35:38,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:38,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:38,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:39,153 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:39,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540290663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:39,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273855502] [2021-11-13 02:35:39,154 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:35:39,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:39,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:35:39,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:35:39,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:35:39,156 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,156 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:39,157 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:35:39,157 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:39,157 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:35:39,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:35:39,159 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_108|], 10=[|v_#valid_109|]} [2021-11-13 02:35:39,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:39,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:35:39,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:39,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:39,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:39,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,166 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:39,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:39,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:39,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:39,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:35:39,173 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:39,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:39,174 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:39,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:35:39,177 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:35:39,177 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:35:39,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,179 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:35:39,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:39,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:35:39,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,221 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:39,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:39,224 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:39,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:35:39,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:39,234 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:39,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:39,238 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:39,777 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:39,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:39,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 106 [2021-11-13 02:35:39,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605234439] [2021-11-13 02:35:39,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:39,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-13 02:35:39,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:39,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-13 02:35:39,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2931, Invalid=9501, Unknown=0, NotChecked=0, Total=12432 [2021-11-13 02:35:39,779 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:41,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:41,855 INFO L93 Difference]: Finished difference Result 370 states and 372 transitions. [2021-11-13 02:35:41,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-13 02:35:41,855 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 209 [2021-11-13 02:35:41,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:41,856 INFO L225 Difference]: With dead ends: 370 [2021-11-13 02:35:41,856 INFO L226 Difference]: Without dead ends: 211 [2021-11-13 02:35:41,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 620 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4756 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5791, Invalid=20941, Unknown=0, NotChecked=0, Total=26732 [2021-11-13 02:35:41,857 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 3 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 1102 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 297.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 1107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.21ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 360.09ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:41,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 541 Invalid, 1107 Unknown, 0 Unchecked, 2.21ms Time], IncrementalHoareTripleChecker [5 Valid, 1102 Invalid, 0 Unknown, 0 Unchecked, 360.09ms Time] [2021-11-13 02:35:41,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-13 02:35:41,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-13 02:35:41,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.0095238095238095) internal successors, (212), 210 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:41,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 212 transitions. [2021-11-13 02:35:41,892 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 212 transitions. Word has length 209 [2021-11-13 02:35:41,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:41,892 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 212 transitions. [2021-11-13 02:35:41,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:41,893 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 212 transitions. [2021-11-13 02:35:41,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-13 02:35:41,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:41,894 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 1, 1, 1, 1] [2021-11-13 02:35:41,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-13 02:35:42,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1902,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:42,096 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:42,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:42,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1377121146, now seen corresponding path program 102 times [2021-11-13 02:35:42,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:42,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755772588] [2021-11-13 02:35:42,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:42,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:42,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:43,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1326 proven. 3979 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:43,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:43,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755772588] [2021-11-13 02:35:43,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1755772588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:43,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502011966] [2021-11-13 02:35:43,235 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:35:43,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:43,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:43,236 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:43,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-13 02:35:43,362 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:35:43,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:43,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 812 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-13 02:35:43,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:43,761 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:43,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:44,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:44,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502011966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:44,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1638905997] [2021-11-13 02:35:44,156 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:35:44,156 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:44,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:35:44,157 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:35:44,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:35:44,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,158 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:44,159 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:35:44,159 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:44,159 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:35:44,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:35:44,161 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_109|], 10=[|v_#valid_110|]} [2021-11-13 02:35:44,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:44,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:35:44,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:44,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:44,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:44,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:44,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:44,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:44,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:44,174 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 23 treesize of output 22 [2021-11-13 02:35:44,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:44,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:44,176 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:44,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,177 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:35:44,178 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:35:44,179 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:35:44,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,181 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:35:44,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:44,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:35:44,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,211 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:44,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:44,215 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:44,216 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:35:44,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:44,225 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:44,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:44,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:44,646 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:44,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:44,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2021-11-13 02:35:44,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978175206] [2021-11-13 02:35:44,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:44,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-13 02:35:44,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:44,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-13 02:35:44,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=2392, Unknown=0, NotChecked=0, Total=3906 [2021-11-13 02:35:44,648 INFO L87 Difference]: Start difference. First operand 211 states and 212 transitions. Second operand has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:45,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:45,785 INFO L93 Difference]: Finished difference Result 222 states and 223 transitions. [2021-11-13 02:35:45,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-13 02:35:45,785 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 210 [2021-11-13 02:35:45,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:45,786 INFO L225 Difference]: With dead ends: 222 [2021-11-13 02:35:45,786 INFO L226 Difference]: Without dead ends: 220 [2021-11-13 02:35:45,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 788 GetRequests, 671 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3494 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4595, Invalid=8977, Unknown=0, NotChecked=0, Total=13572 [2021-11-13 02:35:45,787 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 167 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 540 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 234.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.59ms SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 283.47ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:45,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 21 Invalid, 753 Unknown, 0 Unchecked, 1.59ms Time], IncrementalHoareTripleChecker [213 Valid, 540 Invalid, 0 Unknown, 0 Unchecked, 283.47ms Time] [2021-11-13 02:35:45,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-13 02:35:45,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2021-11-13 02:35:45,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 213 states have (on average 1.0093896713615023) internal successors, (215), 213 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:45,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2021-11-13 02:35:45,822 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 210 [2021-11-13 02:35:45,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:45,823 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2021-11-13 02:35:45,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:45,823 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2021-11-13 02:35:45,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-13 02:35:45,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:45,823 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 1, 1, 1, 1] [2021-11-13 02:35:45,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:46,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1921,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:46,029 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:46,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:46,029 INFO L85 PathProgramCache]: Analyzing trace with hash -283628813, now seen corresponding path program 103 times [2021-11-13 02:35:46,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:46,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033175290] [2021-11-13 02:35:46,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:46,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:46,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:48,873 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:48,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:48,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033175290] [2021-11-13 02:35:48,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033175290] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:48,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367638732] [2021-11-13 02:35:48,873 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:35:48,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:48,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:48,874 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:48,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-13 02:35:48,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:48,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 822 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-13 02:35:48,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:49,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:49,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:49,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:49,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367638732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:49,777 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1988235229] [2021-11-13 02:35:49,777 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:35:49,777 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:49,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:35:49,778 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:35:49,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:35:49,779 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,779 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:49,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:35:49,780 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:49,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:35:49,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:35:49,783 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_110|], 10=[|v_#valid_111|]} [2021-11-13 02:35:49,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:49,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:35:49,787 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:49,788 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:49,788 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:49,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,790 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:49,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:49,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:49,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:49,823 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 23 treesize of output 22 [2021-11-13 02:35:49,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:49,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:49,826 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:49,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:35:49,830 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:35:49,830 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:35:49,831 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:35:49,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,849 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:49,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:35:49,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,866 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:49,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:49,870 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:49,871 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:35:49,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:49,880 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:49,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:49,884 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:50,429 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:50,429 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:50,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 108 [2021-11-13 02:35:50,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757559944] [2021-11-13 02:35:50,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:50,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-13 02:35:50,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:50,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-13 02:35:50,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3040, Invalid=9842, Unknown=0, NotChecked=0, Total=12882 [2021-11-13 02:35:50,431 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:52,501 INFO L93 Difference]: Finished difference Result 377 states and 379 transitions. [2021-11-13 02:35:52,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-13 02:35:52,502 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-13 02:35:52,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:52,502 INFO L225 Difference]: With dead ends: 377 [2021-11-13 02:35:52,502 INFO L226 Difference]: Without dead ends: 215 [2021-11-13 02:35:52,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4927 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6008, Invalid=21714, Unknown=0, NotChecked=0, Total=27722 [2021-11-13 02:35:52,504 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 3 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 260.40ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.99ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 314.77ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:52,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 453 Invalid, 943 Unknown, 0 Unchecked, 1.99ms Time], IncrementalHoareTripleChecker [5 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 314.77ms Time] [2021-11-13 02:35:52,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-11-13 02:35:52,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2021-11-13 02:35:52,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.0093457943925233) internal successors, (216), 214 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 216 transitions. [2021-11-13 02:35:52,561 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 216 transitions. Word has length 213 [2021-11-13 02:35:52,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:52,562 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 216 transitions. [2021-11-13 02:35:52,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,562 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 216 transitions. [2021-11-13 02:35:52,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-13 02:35:52,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:52,563 INFO L514 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 1, 1, 1, 1] [2021-11-13 02:35:52,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:52,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1940,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:52,786 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:52,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:52,786 INFO L85 PathProgramCache]: Analyzing trace with hash -962852310, now seen corresponding path program 104 times [2021-11-13 02:35:52,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:52,786 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413135910] [2021-11-13 02:35:52,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:52,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:52,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1378 proven. 4135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:54,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:54,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413135910] [2021-11-13 02:35:54,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413135910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:54,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364377936] [2021-11-13 02:35:54,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:35:54,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:54,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:54,050 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:54,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-13 02:35:54,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2021-11-13 02:35:54,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:54,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 827 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-13 02:35:54,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:54,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:54,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:55,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:55,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364377936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:55,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37522216] [2021-11-13 02:35:55,125 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:35:55,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:55,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:35:55,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:35:55,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:35:55,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,129 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:55,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:35:55,130 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:35:55,130 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:35:55,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:35:55,132 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_111|], 10=[|v_#valid_112|]} [2021-11-13 02:35:55,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:55,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:35:55,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:55,138 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:35:55,138 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:55,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:55,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:55,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:55,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:35:55,146 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 23 treesize of output 22 [2021-11-13 02:35:55,146 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:55,147 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:35:55,148 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:35:55,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:35:55,150 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:35:55,150 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:35:55,151 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,152 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:35:55,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,165 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:35:55,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:35:55,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,183 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:35:55,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:35:55,186 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:35:55,187 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:35:55,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:35:55,196 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:35:55,197 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:35:55,200 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:35:55,607 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:35:55,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:55,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 58 [2021-11-13 02:35:55,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416697135] [2021-11-13 02:35:55,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:55,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-13 02:35:55,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:55,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-13 02:35:55,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1569, Invalid=2463, Unknown=0, NotChecked=0, Total=4032 [2021-11-13 02:35:55,609 INFO L87 Difference]: Start difference. First operand 215 states and 216 transitions. Second operand has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:56,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:56,812 INFO L93 Difference]: Finished difference Result 226 states and 227 transitions. [2021-11-13 02:35:56,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-13 02:35:56,812 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 214 [2021-11-13 02:35:56,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:56,813 INFO L225 Difference]: With dead ends: 226 [2021-11-13 02:35:56,813 INFO L226 Difference]: Without dead ends: 224 [2021-11-13 02:35:56,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 684 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4762, Invalid=9280, Unknown=0, NotChecked=0, Total=14042 [2021-11-13 02:35:56,815 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 223 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 259.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.68ms SdHoareTripleChecker+Time, 269 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 310.93ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:56,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 17 Invalid, 798 Unknown, 0 Unchecked, 1.68ms Time], IncrementalHoareTripleChecker [269 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 310.93ms Time] [2021-11-13 02:35:56,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-13 02:35:56,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 218. [2021-11-13 02:35:56,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.0092165898617511) internal successors, (219), 217 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:56,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 219 transitions. [2021-11-13 02:35:56,855 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 219 transitions. Word has length 214 [2021-11-13 02:35:56,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:56,855 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 219 transitions. [2021-11-13 02:35:56,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:56,855 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 219 transitions. [2021-11-13 02:35:56,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-11-13 02:35:56,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:56,856 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 1, 1, 1, 1] [2021-11-13 02:35:56,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:57,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1959,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:57,056 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:57,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:57,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1758223055, now seen corresponding path program 105 times [2021-11-13 02:35:57,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:57,057 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124187313] [2021-11-13 02:35:57,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:57,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:57,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:00,003 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:00,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:00,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124187313] [2021-11-13 02:36:00,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124187313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:00,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752036897] [2021-11-13 02:36:00,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:00,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:00,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:00,005 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:00,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-13 02:36:00,130 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:00,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:00,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 837 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-13 02:36:00,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:00,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:00,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:00,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:00,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752036897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:00,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243931278] [2021-11-13 02:36:00,918 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:00,918 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:00,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:00,918 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:00,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:00,919 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,920 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:00,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,920 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:00,921 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:00,921 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:00,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:00,923 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_112|], 10=[|v_#valid_113|]} [2021-11-13 02:36:00,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:00,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:00,927 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:00,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:00,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:00,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,929 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:00,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:00,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:00,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:00,961 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 23 treesize of output 22 [2021-11-13 02:36:00,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:00,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:00,963 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:00,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,964 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,966 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:00,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:00,966 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:00,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:36:00,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:00,982 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:36:00,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:00,998 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:00,999 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:01,001 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:01,003 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:36:01,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:01,011 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:01,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:01,015 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:01,564 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:01,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:01,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 110 [2021-11-13 02:36:01,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409506664] [2021-11-13 02:36:01,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:01,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-13 02:36:01,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:01,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-13 02:36:01,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3151, Invalid=10189, Unknown=0, NotChecked=0, Total=13340 [2021-11-13 02:36:01,566 INFO L87 Difference]: Start difference. First operand 218 states and 219 transitions. Second operand has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:03,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:03,942 INFO L93 Difference]: Finished difference Result 384 states and 386 transitions. [2021-11-13 02:36:03,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-11-13 02:36:03,942 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 217 [2021-11-13 02:36:03,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:03,942 INFO L225 Difference]: With dead ends: 384 [2021-11-13 02:36:03,942 INFO L226 Difference]: Without dead ends: 219 [2021-11-13 02:36:03,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 644 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5101 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6229, Invalid=22501, Unknown=0, NotChecked=0, Total=28730 [2021-11-13 02:36:03,944 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 3 mSDsluCounter, 601 mSDsCounter, 0 mSdLazyCounter, 1351 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 383.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 1357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.71ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 471.46ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:03,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 656 Invalid, 1357 Unknown, 0 Unchecked, 2.71ms Time], IncrementalHoareTripleChecker [6 Valid, 1351 Invalid, 0 Unknown, 0 Unchecked, 471.46ms Time] [2021-11-13 02:36:03,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-13 02:36:03,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-11-13 02:36:03,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0091743119266054) internal successors, (220), 218 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:03,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2021-11-13 02:36:03,993 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 217 [2021-11-13 02:36:03,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:03,993 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2021-11-13 02:36:03,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:03,993 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2021-11-13 02:36:03,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-13 02:36:03,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:03,994 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 1, 1, 1, 1] [2021-11-13 02:36:04,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-13 02:36:04,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1978 [2021-11-13 02:36:04,195 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:04,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:04,195 INFO L85 PathProgramCache]: Analyzing trace with hash 273663622, now seen corresponding path program 106 times [2021-11-13 02:36:04,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:04,195 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944295216] [2021-11-13 02:36:04,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:04,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:04,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1431 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:05,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:05,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944295216] [2021-11-13 02:36:05,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944295216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:05,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22817111] [2021-11-13 02:36:05,391 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:05,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:05,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:05,392 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:05,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-13 02:36:05,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:05,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-13 02:36:05,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:05,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:05,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:06,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:06,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22817111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:06,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017599335] [2021-11-13 02:36:06,347 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:06,347 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:06,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:06,347 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:06,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:06,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,349 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:06,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:06,350 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:06,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:06,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:06,352 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_113|], 10=[|v_#valid_114|]} [2021-11-13 02:36:06,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:06,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:06,357 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:06,357 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:06,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:06,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:06,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:06,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:06,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:06,365 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 23 treesize of output 22 [2021-11-13 02:36:06,365 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:06,367 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,367 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:06,367 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:06,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,369 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:06,370 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:06,370 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:06,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,372 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:36:06,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,384 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:06,386 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:36:06,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,427 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:06,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:06,432 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:06,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:06,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:06,443 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:06,444 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:06,447 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:06,856 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:06,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:06,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 59 [2021-11-13 02:36:06,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340960887] [2021-11-13 02:36:06,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:06,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-13 02:36:06,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:06,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-13 02:36:06,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1625, Invalid=2535, Unknown=0, NotChecked=0, Total=4160 [2021-11-13 02:36:06,858 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:08,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:08,097 INFO L93 Difference]: Finished difference Result 230 states and 231 transitions. [2021-11-13 02:36:08,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-11-13 02:36:08,098 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 218 [2021-11-13 02:36:08,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:08,098 INFO L225 Difference]: With dead ends: 230 [2021-11-13 02:36:08,098 INFO L226 Difference]: Without dead ends: 228 [2021-11-13 02:36:08,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 697 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3736 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=4932, Invalid=9588, Unknown=0, NotChecked=0, Total=14520 [2021-11-13 02:36:08,099 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 229 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 254.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.79ms SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 321.66ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:08,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 21 Invalid, 810 Unknown, 0 Unchecked, 1.79ms Time], IncrementalHoareTripleChecker [274 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 321.66ms Time] [2021-11-13 02:36:08,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-13 02:36:08,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 222. [2021-11-13 02:36:08,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:08,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2021-11-13 02:36:08,142 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 218 [2021-11-13 02:36:08,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:08,142 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2021-11-13 02:36:08,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:08,142 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2021-11-13 02:36:08,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-11-13 02:36:08,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:08,144 INFO L514 BasicCegarLoop]: trace histogram [55, 54, 54, 54, 1, 1, 1, 1] [2021-11-13 02:36:08,178 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2021-11-13 02:36:08,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1997 [2021-11-13 02:36:08,372 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:08,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:08,372 INFO L85 PathProgramCache]: Analyzing trace with hash 869855475, now seen corresponding path program 107 times [2021-11-13 02:36:08,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:08,372 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916504084] [2021-11-13 02:36:08,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:08,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:08,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:11,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:11,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:11,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916504084] [2021-11-13 02:36:11,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916504084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:11,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180796395] [2021-11-13 02:36:11,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:11,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:11,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:11,457 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:11,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-13 02:36:11,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2021-11-13 02:36:11,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:11,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-13 02:36:11,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:12,132 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:12,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:12,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180796395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:12,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1059756413] [2021-11-13 02:36:12,523 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:12,523 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:12,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:12,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:12,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:12,525 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,525 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:12,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:12,526 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:12,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:12,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:12,528 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_114|], 10=[|v_#valid_115|]} [2021-11-13 02:36:12,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:12,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:12,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,533 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:12,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,533 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:12,534 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:12,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:12,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:12,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:12,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:12,555 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 23 treesize of output 22 [2021-11-13 02:36:12,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:12,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,557 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:12,557 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:12,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,559 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:12,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:12,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:12,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,562 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:36:12,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,575 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:12,577 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:12,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,593 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:12,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:12,596 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:12,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:12,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:12,618 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:12,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:12,622 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:13,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:13,180 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:13,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 112 [2021-11-13 02:36:13,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321526672] [2021-11-13 02:36:13,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:13,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-13 02:36:13,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:13,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-13 02:36:13,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3264, Invalid=10542, Unknown=0, NotChecked=0, Total=13806 [2021-11-13 02:36:13,182 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:15,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:15,329 INFO L93 Difference]: Finished difference Result 391 states and 393 transitions. [2021-11-13 02:36:15,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-13 02:36:15,329 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 221 [2021-11-13 02:36:15,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:15,330 INFO L225 Difference]: With dead ends: 391 [2021-11-13 02:36:15,330 INFO L226 Difference]: Without dead ends: 223 [2021-11-13 02:36:15,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5278 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6454, Invalid=23302, Unknown=0, NotChecked=0, Total=29756 [2021-11-13 02:36:15,332 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 3 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 213.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.72ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 269.47ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:15,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 330 Invalid, 699 Unknown, 0 Unchecked, 1.72ms Time], IncrementalHoareTripleChecker [8 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 269.47ms Time] [2021-11-13 02:36:15,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-13 02:36:15,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2021-11-13 02:36:15,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 222 states have (on average 1.009009009009009) internal successors, (224), 222 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:15,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2021-11-13 02:36:15,369 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 221 [2021-11-13 02:36:15,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:15,370 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2021-11-13 02:36:15,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:15,370 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2021-11-13 02:36:15,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-11-13 02:36:15,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:15,370 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 1, 1, 1, 1] [2021-11-13 02:36:15,392 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-13 02:36:15,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2016,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:15,571 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:15,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:15,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1338091818, now seen corresponding path program 108 times [2021-11-13 02:36:15,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:15,571 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311778094] [2021-11-13 02:36:15,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:15,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:15,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:16,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1485 proven. 4456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:16,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:16,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311778094] [2021-11-13 02:36:16,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311778094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:16,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739288660] [2021-11-13 02:36:16,835 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:16,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:16,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:16,836 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:16,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-13 02:36:16,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:16,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:16,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 857 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-13 02:36:16,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:17,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:17,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:17,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:17,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739288660] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:17,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565586503] [2021-11-13 02:36:17,832 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:17,832 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:17,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:17,832 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:17,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:17,834 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,834 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:17,834 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:17,835 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:17,835 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,835 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:17,836 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:17,837 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_115|], 10=[|v_#valid_116|]} [2021-11-13 02:36:17,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:17,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:17,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:17,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:17,842 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:17,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:17,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:17,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:17,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:17,850 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 23 treesize of output 22 [2021-11-13 02:36:17,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:17,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:17,853 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:17,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,854 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,855 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:17,855 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:17,855 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:17,856 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:36:17,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:17,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:36:17,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,905 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:17,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:17,908 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:17,910 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:36:17,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:17,918 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:17,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:17,922 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:18,335 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:18,335 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:18,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 60 [2021-11-13 02:36:18,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668153440] [2021-11-13 02:36:18,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:18,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-13 02:36:18,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:18,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-13 02:36:18,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=2608, Unknown=0, NotChecked=0, Total=4290 [2021-11-13 02:36:18,337 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:19,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:19,600 INFO L93 Difference]: Finished difference Result 234 states and 235 transitions. [2021-11-13 02:36:19,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-13 02:36:19,600 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 222 [2021-11-13 02:36:19,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:19,600 INFO L225 Difference]: With dead ends: 234 [2021-11-13 02:36:19,601 INFO L226 Difference]: Without dead ends: 232 [2021-11-13 02:36:19,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 710 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3860 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=5105, Invalid=9901, Unknown=0, NotChecked=0, Total=15006 [2021-11-13 02:36:19,602 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 228 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 260.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.91ms SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 313.90ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:19,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 23 Invalid, 838 Unknown, 0 Unchecked, 1.91ms Time], IncrementalHoareTripleChecker [279 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 313.90ms Time] [2021-11-13 02:36:19,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-13 02:36:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 226. [2021-11-13 02:36:19,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 225 states have (on average 1.008888888888889) internal successors, (227), 225 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:19,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2021-11-13 02:36:19,661 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2021-11-13 02:36:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:19,661 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2021-11-13 02:36:19,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:19,661 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2021-11-13 02:36:19,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-11-13 02:36:19,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:19,662 INFO L514 BasicCegarLoop]: trace histogram [56, 55, 55, 55, 1, 1, 1, 1] [2021-11-13 02:36:19,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:19,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2035 [2021-11-13 02:36:19,862 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:19,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:19,863 INFO L85 PathProgramCache]: Analyzing trace with hash 1506696143, now seen corresponding path program 109 times [2021-11-13 02:36:19,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:19,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54767081] [2021-11-13 02:36:19,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:19,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:19,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:23,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:23,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54767081] [2021-11-13 02:36:23,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54767081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:23,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054304650] [2021-11-13 02:36:23,012 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:23,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:23,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:23,013 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:23,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-13 02:36:23,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:23,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-13 02:36:23,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:23,547 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:23,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:23,938 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:23,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054304650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:23,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [752793143] [2021-11-13 02:36:23,939 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:23,939 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:23,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:23,939 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:23,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:23,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,941 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:23,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:23,942 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:23,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:23,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:23,944 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_116|], 10=[|v_#valid_117|]} [2021-11-13 02:36:23,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:23,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:23,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:23,949 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:23,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:23,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:23,951 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:23,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:23,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:23,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:23,957 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 23 treesize of output 22 [2021-11-13 02:36:23,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:23,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:23,959 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:23,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:23,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:23,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:23,961 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:23,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:36:23,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:23,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:23,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:23,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:23,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:36:23,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,006 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:24,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:24,010 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:24,011 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:36:24,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:24,020 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:24,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:24,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:24,587 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:24,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:24,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 114 [2021-11-13 02:36:24,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286731856] [2021-11-13 02:36:24,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:24,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-13 02:36:24,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:24,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-13 02:36:24,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3379, Invalid=10901, Unknown=0, NotChecked=0, Total=14280 [2021-11-13 02:36:24,590 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:26,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:26,825 INFO L93 Difference]: Finished difference Result 398 states and 400 transitions. [2021-11-13 02:36:26,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-13 02:36:26,826 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 225 [2021-11-13 02:36:26,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:26,826 INFO L225 Difference]: With dead ends: 398 [2021-11-13 02:36:26,826 INFO L226 Difference]: Without dead ends: 227 [2021-11-13 02:36:26,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 668 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5458 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6683, Invalid=24117, Unknown=0, NotChecked=0, Total=30800 [2021-11-13 02:36:26,828 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 3 mSDsluCounter, 353 mSDsCounter, 0 mSdLazyCounter, 854 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 248.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.91ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 299.20ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:26,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 410 Invalid, 861 Unknown, 0 Unchecked, 1.91ms Time], IncrementalHoareTripleChecker [7 Valid, 854 Invalid, 0 Unknown, 0 Unchecked, 299.20ms Time] [2021-11-13 02:36:26,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-13 02:36:26,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2021-11-13 02:36:26,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.008849557522124) internal successors, (228), 226 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:26,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2021-11-13 02:36:26,866 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 225 [2021-11-13 02:36:26,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:26,866 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2021-11-13 02:36:26,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:26,867 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2021-11-13 02:36:26,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-13 02:36:26,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:26,867 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 1, 1, 1, 1] [2021-11-13 02:36:26,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2021-11-13 02:36:27,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2054,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:27,068 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:27,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:27,068 INFO L85 PathProgramCache]: Analyzing trace with hash 1705123974, now seen corresponding path program 110 times [2021-11-13 02:36:27,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:27,068 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941428868] [2021-11-13 02:36:27,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:27,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:27,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:28,354 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1540 proven. 4621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:28,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:28,354 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941428868] [2021-11-13 02:36:28,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941428868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:28,354 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972364824] [2021-11-13 02:36:28,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:28,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:28,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:28,355 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:28,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-13 02:36:28,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2021-11-13 02:36:28,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:28,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 872 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-13 02:36:28,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:29,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:29,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:29,496 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:29,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972364824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:29,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735340063] [2021-11-13 02:36:29,497 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:29,497 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:29,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:29,498 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:29,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:29,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,503 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:29,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:29,504 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:29,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:29,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:29,506 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_117|], 10=[|v_#valid_118|]} [2021-11-13 02:36:29,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:29,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:29,511 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,511 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:29,511 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,511 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:29,512 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:29,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:29,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:29,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:29,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:29,533 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 23 treesize of output 22 [2021-11-13 02:36:29,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:29,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:29,535 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:29,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:29,538 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:29,538 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:29,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,540 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:36:29,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:29,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:29,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,571 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:29,571 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:29,574 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:29,575 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:29,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:29,584 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:29,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:29,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:30,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:30,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:30,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 61 [2021-11-13 02:36:30,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161875758] [2021-11-13 02:36:30,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:30,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-13 02:36:30,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:30,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-13 02:36:30,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=2682, Unknown=0, NotChecked=0, Total=4422 [2021-11-13 02:36:30,005 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:31,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:31,269 INFO L93 Difference]: Finished difference Result 238 states and 239 transitions. [2021-11-13 02:36:31,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-11-13 02:36:31,270 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 226 [2021-11-13 02:36:31,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:31,270 INFO L225 Difference]: With dead ends: 238 [2021-11-13 02:36:31,270 INFO L226 Difference]: Without dead ends: 236 [2021-11-13 02:36:31,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 723 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3986 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5281, Invalid=10219, Unknown=0, NotChecked=0, Total=15500 [2021-11-13 02:36:31,271 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 180 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 589 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 254.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.68ms SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 306.42ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:31,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 20 Invalid, 817 Unknown, 0 Unchecked, 1.68ms Time], IncrementalHoareTripleChecker [228 Valid, 589 Invalid, 0 Unknown, 0 Unchecked, 306.42ms Time] [2021-11-13 02:36:31,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-13 02:36:31,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 230. [2021-11-13 02:36:31,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:31,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2021-11-13 02:36:31,312 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 226 [2021-11-13 02:36:31,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:31,312 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2021-11-13 02:36:31,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:31,312 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2021-11-13 02:36:31,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-13 02:36:31,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:31,313 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 56, 1, 1, 1, 1] [2021-11-13 02:36:31,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:31,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2073,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:31,513 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:31,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:31,514 INFO L85 PathProgramCache]: Analyzing trace with hash 774919923, now seen corresponding path program 111 times [2021-11-13 02:36:31,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:31,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152150465] [2021-11-13 02:36:31,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:31,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:31,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:34,787 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:34,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:34,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152150465] [2021-11-13 02:36:34,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152150465] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:34,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245260453] [2021-11-13 02:36:34,788 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:34,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:34,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:34,788 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:34,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-13 02:36:34,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:34,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:34,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 882 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-13 02:36:34,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:35,347 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:35,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:35,758 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:35,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245260453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:35,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761864610] [2021-11-13 02:36:35,759 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:35,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:35,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:35,760 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:35,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:35,761 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,761 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:35,762 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:35,762 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:35,762 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:35,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:35,764 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_118|], 10=[|v_#valid_119|]} [2021-11-13 02:36:35,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:35,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:35,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:35,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:35,769 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:35,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:35,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:35,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:35,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:35,777 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 23 treesize of output 22 [2021-11-13 02:36:35,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:35,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:35,779 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:35,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,780 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:35,781 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:35,781 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:35,782 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,783 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:36:35,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:35,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:35,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,814 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:35,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:35,818 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:35,819 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:35,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:35,827 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:35,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:35,832 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:36,399 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:36,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:36,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 116 [2021-11-13 02:36:36,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770452837] [2021-11-13 02:36:36,400 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:36,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-13 02:36:36,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:36,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-13 02:36:36,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=11266, Unknown=0, NotChecked=0, Total=14762 [2021-11-13 02:36:36,403 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:38,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:38,907 INFO L93 Difference]: Finished difference Result 405 states and 407 transitions. [2021-11-13 02:36:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-13 02:36:38,907 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 229 [2021-11-13 02:36:38,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:38,908 INFO L225 Difference]: With dead ends: 405 [2021-11-13 02:36:38,908 INFO L226 Difference]: Without dead ends: 231 [2021-11-13 02:36:38,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 680 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5641 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=6916, Invalid=24946, Unknown=0, NotChecked=0, Total=31862 [2021-11-13 02:36:38,910 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 3 mSDsluCounter, 629 mSDsCounter, 0 mSdLazyCounter, 1403 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 370.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 687 SdHoareTripleChecker+Invalid, 1409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.67ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 449.07ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:38,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 687 Invalid, 1409 Unknown, 0 Unchecked, 2.67ms Time], IncrementalHoareTripleChecker [6 Valid, 1403 Invalid, 0 Unknown, 0 Unchecked, 449.07ms Time] [2021-11-13 02:36:38,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-13 02:36:38,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-13 02:36:38,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.008695652173913) internal successors, (232), 230 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:38,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 232 transitions. [2021-11-13 02:36:38,950 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 232 transitions. Word has length 229 [2021-11-13 02:36:38,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:38,950 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 232 transitions. [2021-11-13 02:36:38,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:38,950 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 232 transitions. [2021-11-13 02:36:38,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-11-13 02:36:38,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:38,951 INFO L514 BasicCegarLoop]: trace histogram [57, 57, 56, 56, 1, 1, 1, 1] [2021-11-13 02:36:38,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:39,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2092 [2021-11-13 02:36:39,152 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:39,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:39,152 INFO L85 PathProgramCache]: Analyzing trace with hash -325785558, now seen corresponding path program 112 times [2021-11-13 02:36:39,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:39,152 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538824295] [2021-11-13 02:36:39,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:39,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:39,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:40,474 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1596 proven. 4789 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:40,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:40,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538824295] [2021-11-13 02:36:40,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538824295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:40,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460226973] [2021-11-13 02:36:40,475 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:40,475 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:40,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:40,475 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:40,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-13 02:36:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:40,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 887 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-13 02:36:40,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:41,050 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:41,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:41,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:41,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1460226973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:41,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520168342] [2021-11-13 02:36:41,480 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:41,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:41,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:41,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:41,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:41,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,482 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:41,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:41,483 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:41,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:41,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:41,485 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_119|], 10=[|v_#valid_120|]} [2021-11-13 02:36:41,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:41,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:41,489 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,489 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:41,490 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,490 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:41,490 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:41,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,491 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:41,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:41,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:41,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:41,498 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 23 treesize of output 22 [2021-11-13 02:36:41,498 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:41,499 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:41,499 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:41,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,501 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:41,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:41,502 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:41,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,504 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:36:41,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,517 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:41,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:41,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,535 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:41,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:41,538 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:41,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:41,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:41,548 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:41,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:41,552 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:41,987 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:41,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:41,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 62 [2021-11-13 02:36:41,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414581061] [2021-11-13 02:36:41,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:41,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-13 02:36:41,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:41,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-13 02:36:41,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1799, Invalid=2757, Unknown=0, NotChecked=0, Total=4556 [2021-11-13 02:36:41,989 INFO L87 Difference]: Start difference. First operand 231 states and 232 transitions. Second operand has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:43,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:43,328 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2021-11-13 02:36:43,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-11-13 02:36:43,329 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 230 [2021-11-13 02:36:43,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:43,329 INFO L225 Difference]: With dead ends: 242 [2021-11-13 02:36:43,329 INFO L226 Difference]: Without dead ends: 240 [2021-11-13 02:36:43,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 736 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4114 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=5460, Invalid=10542, Unknown=0, NotChecked=0, Total=16002 [2021-11-13 02:36:43,331 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 237 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 274.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.98ms SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 330.71ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:43,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 21 Invalid, 872 Unknown, 0 Unchecked, 1.98ms Time], IncrementalHoareTripleChecker [289 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 330.71ms Time] [2021-11-13 02:36:43,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-11-13 02:36:43,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 234. [2021-11-13 02:36:43,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.0085836909871244) internal successors, (235), 233 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:43,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 235 transitions. [2021-11-13 02:36:43,372 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 235 transitions. Word has length 230 [2021-11-13 02:36:43,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:43,372 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 235 transitions. [2021-11-13 02:36:43,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:43,373 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 235 transitions. [2021-11-13 02:36:43,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-11-13 02:36:43,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:43,373 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 1, 1, 1, 1] [2021-11-13 02:36:43,393 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-13 02:36:43,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2111 [2021-11-13 02:36:43,574 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:43,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:43,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1153350863, now seen corresponding path program 113 times [2021-11-13 02:36:43,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:43,574 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831223802] [2021-11-13 02:36:43,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:43,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:43,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:46,935 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:46,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:46,935 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831223802] [2021-11-13 02:36:46,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831223802] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:46,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028255636] [2021-11-13 02:36:46,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:46,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:46,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:46,936 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:46,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-13 02:36:47,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-13 02:36:47,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:47,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-13 02:36:47,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:47,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:47,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:48,082 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:48,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028255636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:48,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815309579] [2021-11-13 02:36:48,083 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:48,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:48,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:48,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:48,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:48,085 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,085 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:48,085 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,086 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:48,086 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:48,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,086 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:48,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:48,088 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_120|], 10=[|v_#valid_121|]} [2021-11-13 02:36:48,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:48,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:48,092 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:48,093 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:48,093 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:48,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,095 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:48,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:48,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:48,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:48,101 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 23 treesize of output 22 [2021-11-13 02:36:48,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:48,102 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:48,103 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:48,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:48,105 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:48,105 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:48,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,107 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:36:48,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,120 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:48,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:48,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,137 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:48,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:48,141 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:48,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:36:48,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:48,151 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:48,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:48,155 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:48,733 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:48,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:48,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 118 [2021-11-13 02:36:48,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581796535] [2021-11-13 02:36:48,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:48,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-13 02:36:48,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:48,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-13 02:36:48,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3615, Invalid=11637, Unknown=0, NotChecked=0, Total=15252 [2021-11-13 02:36:48,736 INFO L87 Difference]: Start difference. First operand 234 states and 235 transitions. Second operand has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:51,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:51,308 INFO L93 Difference]: Finished difference Result 412 states and 414 transitions. [2021-11-13 02:36:51,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-13 02:36:51,308 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 233 [2021-11-13 02:36:51,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:51,308 INFO L225 Difference]: With dead ends: 412 [2021-11-13 02:36:51,308 INFO L226 Difference]: Without dead ends: 235 [2021-11-13 02:36:51,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 692 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5827 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=7153, Invalid=25789, Unknown=0, NotChecked=0, Total=32942 [2021-11-13 02:36:51,311 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 3 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 1386 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 367.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 1392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.80ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 445.55ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:51,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 673 Invalid, 1392 Unknown, 0 Unchecked, 2.80ms Time], IncrementalHoareTripleChecker [6 Valid, 1386 Invalid, 0 Unknown, 0 Unchecked, 445.55ms Time] [2021-11-13 02:36:51,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-13 02:36:51,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2021-11-13 02:36:51,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 1.0085470085470085) internal successors, (236), 234 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:51,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 236 transitions. [2021-11-13 02:36:51,356 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 236 transitions. Word has length 233 [2021-11-13 02:36:51,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:51,356 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 236 transitions. [2021-11-13 02:36:51,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:51,356 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 236 transitions. [2021-11-13 02:36:51,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2021-11-13 02:36:51,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:51,357 INFO L514 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 1, 1, 1, 1] [2021-11-13 02:36:51,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:51,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2130,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:51,560 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:51,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:51,560 INFO L85 PathProgramCache]: Analyzing trace with hash 796514950, now seen corresponding path program 114 times [2021-11-13 02:36:51,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:51,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852050306] [2021-11-13 02:36:51,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:51,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:51,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:52,932 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1653 proven. 4960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:52,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:52,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852050306] [2021-11-13 02:36:52,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852050306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:52,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263907125] [2021-11-13 02:36:52,932 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:52,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:52,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:52,933 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:52,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-13 02:36:53,072 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:53,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:53,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 902 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-13 02:36:53,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:53,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:53,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:53,954 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:53,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263907125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:53,955 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547155737] [2021-11-13 02:36:53,955 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:36:53,955 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:53,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:36:53,956 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:36:53,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:36:53,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,957 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:53,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:36:53,958 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:36:53,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:36:53,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:36:53,960 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_121|], 10=[|v_#valid_122|]} [2021-11-13 02:36:53,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:53,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:36:53,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,965 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:53,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,965 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:36:53,965 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:53,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:53,967 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:53,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:53,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:53,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:36:53,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:36:53,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:53,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:36:53,975 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:36:53,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:53,976 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,977 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:36:53,978 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:36:53,978 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:36:53,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,980 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:36:53,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:53,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:53,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:53,993 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:36:53,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:36:53,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,011 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:36:54,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:36:54,014 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:36:54,015 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:36:54,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:36:54,043 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:36:54,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:36:54,047 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:36:54,470 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:36:54,470 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:54,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 63 [2021-11-13 02:36:54,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560939070] [2021-11-13 02:36:54,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:54,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-13 02:36:54,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:54,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-13 02:36:54,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=2833, Unknown=0, NotChecked=0, Total=4692 [2021-11-13 02:36:54,472 INFO L87 Difference]: Start difference. First operand 235 states and 236 transitions. Second operand has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:55,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:55,816 INFO L93 Difference]: Finished difference Result 246 states and 247 transitions. [2021-11-13 02:36:55,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-11-13 02:36:55,817 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 234 [2021-11-13 02:36:55,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:55,817 INFO L225 Difference]: With dead ends: 246 [2021-11-13 02:36:55,817 INFO L226 Difference]: Without dead ends: 244 [2021-11-13 02:36:55,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 749 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4244 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=5642, Invalid=10870, Unknown=0, NotChecked=0, Total=16512 [2021-11-13 02:36:55,818 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 186 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 265.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.76ms SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 320.39ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:55,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 18 Invalid, 857 Unknown, 0 Unchecked, 1.76ms Time], IncrementalHoareTripleChecker [236 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 320.39ms Time] [2021-11-13 02:36:55,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-13 02:36:55,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 238. [2021-11-13 02:36:55,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 1.0084388185654007) internal successors, (239), 237 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:55,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2021-11-13 02:36:55,861 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 234 [2021-11-13 02:36:55,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:55,861 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2021-11-13 02:36:55,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:36:55,861 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2021-11-13 02:36:55,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2021-11-13 02:36:55,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:55,862 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 58, 1, 1, 1, 1] [2021-11-13 02:36:55,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:56,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2149,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:56,062 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:56,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:56,063 INFO L85 PathProgramCache]: Analyzing trace with hash -712614669, now seen corresponding path program 115 times [2021-11-13 02:36:56,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:56,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610146153] [2021-11-13 02:36:56,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:56,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:56,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:59,535 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:36:59,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:59,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610146153] [2021-11-13 02:36:59,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610146153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:59,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456308036] [2021-11-13 02:36:59,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:59,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:59,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:59,536 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:59,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-13 02:36:59,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:59,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-13 02:36:59,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:00,125 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:00,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:00,538 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:00,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456308036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:00,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671274241] [2021-11-13 02:37:00,539 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:00,539 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:00,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:00,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:00,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:00,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,545 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:00,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:00,546 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:00,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:00,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:00,548 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_122|], 10=[|v_#valid_123|]} [2021-11-13 02:37:00,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:00,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:00,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:00,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:00,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:00,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,555 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:00,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:00,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:00,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:00,561 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 23 treesize of output 22 [2021-11-13 02:37:00,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:00,563 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:00,563 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:00,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,564 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:00,566 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:00,566 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:00,567 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,568 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:37:00,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:00,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:37:00,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,602 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:00,603 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:00,606 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:00,607 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:37:00,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:00,616 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:00,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:00,620 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:01,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:01,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:01,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 120 [2021-11-13 02:37:01,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823510813] [2021-11-13 02:37:01,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:01,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-13 02:37:01,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:01,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-13 02:37:01,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3736, Invalid=12014, Unknown=0, NotChecked=0, Total=15750 [2021-11-13 02:37:01,203 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:03,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:03,715 INFO L93 Difference]: Finished difference Result 419 states and 421 transitions. [2021-11-13 02:37:03,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-13 02:37:03,716 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 237 [2021-11-13 02:37:03,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:03,716 INFO L225 Difference]: With dead ends: 419 [2021-11-13 02:37:03,716 INFO L226 Difference]: Without dead ends: 239 [2021-11-13 02:37:03,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 704 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6016 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=7394, Invalid=26646, Unknown=0, NotChecked=0, Total=34040 [2021-11-13 02:37:03,719 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 3 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 909 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 264.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.12ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 909 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 319.05ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:03,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 437 Invalid, 914 Unknown, 0 Unchecked, 2.12ms Time], IncrementalHoareTripleChecker [5 Valid, 909 Invalid, 0 Unknown, 0 Unchecked, 319.05ms Time] [2021-11-13 02:37:03,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-13 02:37:03,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-13 02:37:03,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0084033613445378) internal successors, (240), 238 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:03,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2021-11-13 02:37:03,763 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 237 [2021-11-13 02:37:03,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:03,764 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2021-11-13 02:37:03,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:03,764 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2021-11-13 02:37:03,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-13 02:37:03,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:03,765 INFO L514 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 1, 1, 1, 1] [2021-11-13 02:37:03,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:03,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2168,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:03,965 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:03,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:03,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1921136854, now seen corresponding path program 116 times [2021-11-13 02:37:03,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:03,966 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468681858] [2021-11-13 02:37:03,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:03,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:04,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:05,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1711 proven. 5134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:05,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:05,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468681858] [2021-11-13 02:37:05,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468681858] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:05,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584835443] [2021-11-13 02:37:05,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:37:05,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:05,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:05,360 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:05,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-13 02:37:05,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2021-11-13 02:37:05,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:05,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-13 02:37:05,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:06,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:06,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:06,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:06,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584835443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:06,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1911184463] [2021-11-13 02:37:06,575 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:06,575 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:06,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:06,575 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:06,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:06,577 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,577 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:06,577 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:06,578 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:06,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:06,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:06,582 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_123|], 10=[|v_#valid_124|]} [2021-11-13 02:37:06,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:06,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:06,587 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:06,587 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:06,588 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:06,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,589 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:06,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:06,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:06,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:06,595 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 23 treesize of output 22 [2021-11-13 02:37:06,595 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:06,597 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:06,597 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:06,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,598 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:06,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:06,600 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:06,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,602 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:37:06,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:06,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:37:06,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,632 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:06,633 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:06,636 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:06,637 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:37:06,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:06,646 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:06,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:06,650 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:07,075 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:07,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:07,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 64 [2021-11-13 02:37:07,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270455826] [2021-11-13 02:37:07,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:07,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-13 02:37:07,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:07,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-13 02:37:07,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1920, Invalid=2910, Unknown=0, NotChecked=0, Total=4830 [2021-11-13 02:37:07,077 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:08,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:08,457 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2021-11-13 02:37:08,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-11-13 02:37:08,457 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 238 [2021-11-13 02:37:08,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:08,458 INFO L225 Difference]: With dead ends: 250 [2021-11-13 02:37:08,458 INFO L226 Difference]: Without dead ends: 248 [2021-11-13 02:37:08,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 762 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4376 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5827, Invalid=11203, Unknown=0, NotChecked=0, Total=17030 [2021-11-13 02:37:08,459 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 185 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 616 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 268.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.75ms SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 616 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 323.61ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:08,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 15 Invalid, 857 Unknown, 0 Unchecked, 1.75ms Time], IncrementalHoareTripleChecker [241 Valid, 616 Invalid, 0 Unknown, 0 Unchecked, 323.61ms Time] [2021-11-13 02:37:08,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-13 02:37:08,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2021-11-13 02:37:08,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 1.008298755186722) internal successors, (243), 241 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:08,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 243 transitions. [2021-11-13 02:37:08,503 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 243 transitions. Word has length 238 [2021-11-13 02:37:08,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:08,503 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 243 transitions. [2021-11-13 02:37:08,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:08,504 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 243 transitions. [2021-11-13 02:37:08,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-11-13 02:37:08,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:08,504 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 1, 1, 1, 1] [2021-11-13 02:37:08,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:08,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2187,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:08,705 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:08,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:08,705 INFO L85 PathProgramCache]: Analyzing trace with hash -2143978033, now seen corresponding path program 117 times [2021-11-13 02:37:08,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:08,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191817428] [2021-11-13 02:37:08,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:08,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:08,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:12,291 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:12,291 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:12,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191817428] [2021-11-13 02:37:12,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191817428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:12,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388550084] [2021-11-13 02:37:12,292 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:37:12,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:12,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:12,296 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:12,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-13 02:37:12,461 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:37:12,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:12,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 122 conjunts are in the unsatisfiable core [2021-11-13 02:37:12,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:12,909 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:12,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:13,329 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:13,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388550084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:13,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514406552] [2021-11-13 02:37:13,330 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:13,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:13,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:13,331 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:13,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:13,332 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,336 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:13,348 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,348 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:13,348 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:13,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:13,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:13,351 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_124|], 10=[|v_#valid_125|]} [2021-11-13 02:37:13,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:13,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:13,355 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,355 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:13,355 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,356 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:13,356 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:13,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,357 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:13,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:13,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:13,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:13,363 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 23 treesize of output 22 [2021-11-13 02:37:13,364 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:13,365 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:13,365 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:13,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,367 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,368 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:13,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:13,368 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:13,369 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,370 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:37:13,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,382 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:13,385 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:37:13,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,401 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:13,403 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:13,407 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:13,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:37:13,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:13,420 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:13,421 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:13,424 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:14,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:14,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:14,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 122 [2021-11-13 02:37:14,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217595212] [2021-11-13 02:37:14,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:14,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-13 02:37:14,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:14,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-13 02:37:14,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3859, Invalid=12397, Unknown=0, NotChecked=0, Total=16256 [2021-11-13 02:37:14,013 INFO L87 Difference]: Start difference. First operand 242 states and 243 transitions. Second operand has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:16,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:16,695 INFO L93 Difference]: Finished difference Result 426 states and 428 transitions. [2021-11-13 02:37:16,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-13 02:37:16,695 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 241 [2021-11-13 02:37:16,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:16,696 INFO L225 Difference]: With dead ends: 426 [2021-11-13 02:37:16,696 INFO L226 Difference]: Without dead ends: 243 [2021-11-13 02:37:16,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 716 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6208 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=7639, Invalid=27517, Unknown=0, NotChecked=0, Total=35156 [2021-11-13 02:37:16,698 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 3 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 1303 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 350.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 1307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.69ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 424.91ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:16,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 641 Invalid, 1307 Unknown, 0 Unchecked, 2.69ms Time], IncrementalHoareTripleChecker [4 Valid, 1303 Invalid, 0 Unknown, 0 Unchecked, 424.91ms Time] [2021-11-13 02:37:16,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-13 02:37:16,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-11-13 02:37:16,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.0082644628099173) internal successors, (244), 242 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:16,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 244 transitions. [2021-11-13 02:37:16,742 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 244 transitions. Word has length 241 [2021-11-13 02:37:16,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:16,743 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 244 transitions. [2021-11-13 02:37:16,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:16,743 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 244 transitions. [2021-11-13 02:37:16,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-13 02:37:16,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:16,743 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 59, 59, 1, 1, 1, 1] [2021-11-13 02:37:16,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:16,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2206 [2021-11-13 02:37:16,944 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:16,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:16,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1030681734, now seen corresponding path program 118 times [2021-11-13 02:37:16,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:16,944 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911896193] [2021-11-13 02:37:16,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:16,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:17,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:18,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1770 proven. 5311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:18,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:18,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911896193] [2021-11-13 02:37:18,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911896193] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:18,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670302666] [2021-11-13 02:37:18,390 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:37:18,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:18,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:18,391 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:18,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-13 02:37:18,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:18,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 932 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-13 02:37:18,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:18,980 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:18,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:19,435 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:19,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670302666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:19,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625158198] [2021-11-13 02:37:19,436 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:19,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:19,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:19,436 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:19,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:19,443 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,443 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:19,444 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,444 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:19,444 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:19,445 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:19,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:19,446 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_125|], 10=[|v_#valid_126|]} [2021-11-13 02:37:19,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:19,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:19,451 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,451 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:19,452 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,452 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:19,452 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:19,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,453 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:19,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:19,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:19,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:19,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:37:19,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:19,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:19,461 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:19,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,463 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,464 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:19,464 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:19,464 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:19,465 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,466 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:37:19,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,479 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:19,481 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:37:19,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,496 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:19,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:19,505 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:19,506 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:37:19,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:19,515 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:19,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:19,519 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:19,964 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:19,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:19,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 65 [2021-11-13 02:37:19,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805555725] [2021-11-13 02:37:19,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:19,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-13 02:37:19,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:19,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-13 02:37:19,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1982, Invalid=2988, Unknown=0, NotChecked=0, Total=4970 [2021-11-13 02:37:19,965 INFO L87 Difference]: Start difference. First operand 243 states and 244 transitions. Second operand has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:21,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:21,358 INFO L93 Difference]: Finished difference Result 254 states and 255 transitions. [2021-11-13 02:37:21,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-11-13 02:37:21,358 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 242 [2021-11-13 02:37:21,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:21,359 INFO L225 Difference]: With dead ends: 254 [2021-11-13 02:37:21,359 INFO L226 Difference]: Without dead ends: 252 [2021-11-13 02:37:21,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 775 SyntacticMatches, 2 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4510 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6015, Invalid=11541, Unknown=0, NotChecked=0, Total=17556 [2021-11-13 02:37:21,361 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 193 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 263.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.81ms SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 318.38ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:21,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 15 Invalid, 833 Unknown, 0 Unchecked, 1.81ms Time], IncrementalHoareTripleChecker [245 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 318.38ms Time] [2021-11-13 02:37:21,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-13 02:37:21,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2021-11-13 02:37:21,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.0081632653061225) internal successors, (247), 245 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:21,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 247 transitions. [2021-11-13 02:37:21,406 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 247 transitions. Word has length 242 [2021-11-13 02:37:21,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:21,407 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 247 transitions. [2021-11-13 02:37:21,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:21,407 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 247 transitions. [2021-11-13 02:37:21,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-11-13 02:37:21,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:21,407 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 60, 1, 1, 1, 1] [2021-11-13 02:37:21,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:21,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2225 [2021-11-13 02:37:21,608 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:21,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:21,608 INFO L85 PathProgramCache]: Analyzing trace with hash 323158771, now seen corresponding path program 119 times [2021-11-13 02:37:21,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:21,608 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126707521] [2021-11-13 02:37:21,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:21,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:21,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:25,325 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:25,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:25,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126707521] [2021-11-13 02:37:25,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126707521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:25,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050233792] [2021-11-13 02:37:25,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:37:25,325 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:25,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:25,326 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:25,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-13 02:37:25,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2021-11-13 02:37:25,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:25,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 942 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-13 02:37:25,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:26,101 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:26,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:26,530 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:26,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050233792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:26,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534066047] [2021-11-13 02:37:26,531 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:26,531 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:26,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:26,532 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:26,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:26,538 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,539 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:26,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,539 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:26,539 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:26,540 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:26,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:26,542 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_126|], 10=[|v_#valid_127|]} [2021-11-13 02:37:26,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:26,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:26,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:26,547 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:26,547 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:26,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,548 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:26,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:26,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:26,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:26,554 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 23 treesize of output 22 [2021-11-13 02:37:26,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:26,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:26,556 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:26,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,558 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,559 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:26,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:26,559 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:26,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,561 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:37:26,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,574 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:26,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:37:26,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,592 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:26,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:26,595 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:26,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:37:26,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:26,605 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:26,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:26,609 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:27,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:27,216 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:27,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 124 [2021-11-13 02:37:27,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475240983] [2021-11-13 02:37:27,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:27,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-13 02:37:27,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:27,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-13 02:37:27,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3984, Invalid=12786, Unknown=0, NotChecked=0, Total=16770 [2021-11-13 02:37:27,219 INFO L87 Difference]: Start difference. First operand 246 states and 247 transitions. Second operand has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:29,935 INFO L93 Difference]: Finished difference Result 433 states and 435 transitions. [2021-11-13 02:37:29,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-13 02:37:29,935 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 245 [2021-11-13 02:37:29,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:29,936 INFO L225 Difference]: With dead ends: 433 [2021-11-13 02:37:29,936 INFO L226 Difference]: Without dead ends: 247 [2021-11-13 02:37:29,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 728 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6403 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=7888, Invalid=28402, Unknown=0, NotChecked=0, Total=36290 [2021-11-13 02:37:29,938 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 3 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 1204 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 342.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 585 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.66ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 412.73ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:29,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 585 Invalid, 1213 Unknown, 0 Unchecked, 2.66ms Time], IncrementalHoareTripleChecker [9 Valid, 1204 Invalid, 0 Unknown, 0 Unchecked, 412.73ms Time] [2021-11-13 02:37:29,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-13 02:37:29,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2021-11-13 02:37:29,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 1.008130081300813) internal successors, (248), 246 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:29,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2021-11-13 02:37:29,983 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 245 [2021-11-13 02:37:29,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:29,984 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2021-11-13 02:37:29,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:29,984 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2021-11-13 02:37:29,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-11-13 02:37:29,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:29,985 INFO L514 BasicCegarLoop]: trace histogram [61, 61, 60, 60, 1, 1, 1, 1] [2021-11-13 02:37:30,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:30,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2244 [2021-11-13 02:37:30,185 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:30,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:30,185 INFO L85 PathProgramCache]: Analyzing trace with hash 350504490, now seen corresponding path program 120 times [2021-11-13 02:37:30,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:30,186 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818113022] [2021-11-13 02:37:30,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:30,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:30,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:31,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1830 proven. 5491 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:31,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:31,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818113022] [2021-11-13 02:37:31,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818113022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:31,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997788029] [2021-11-13 02:37:31,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:37:31,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:31,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:31,688 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:31,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-13 02:37:31,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:37:31,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:31,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 947 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-13 02:37:31,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:32,317 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:32,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:32,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:32,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997788029] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:32,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954891485] [2021-11-13 02:37:32,838 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:32,839 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:32,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:32,839 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:32,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:32,840 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,841 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:32,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:32,841 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:32,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:32,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:32,844 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_127|], 10=[|v_#valid_128|]} [2021-11-13 02:37:32,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:32,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:32,848 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:32,849 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:32,849 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:32,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,851 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:32,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:32,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:32,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:32,857 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 23 treesize of output 22 [2021-11-13 02:37:32,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:32,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:32,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:32,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,860 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,861 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:32,862 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:32,862 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:32,863 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:37:32,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:32,879 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:37:32,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,895 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:32,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:32,898 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:32,900 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:37:32,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:32,908 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:32,909 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:32,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:33,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:33,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:33,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 66 [2021-11-13 02:37:33,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032749389] [2021-11-13 02:37:33,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:33,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-13 02:37:33,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:33,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-13 02:37:33,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=3067, Unknown=0, NotChecked=0, Total=5112 [2021-11-13 02:37:33,347 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:34,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:34,793 INFO L93 Difference]: Finished difference Result 258 states and 259 transitions. [2021-11-13 02:37:34,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-11-13 02:37:34,793 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 246 [2021-11-13 02:37:34,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:34,794 INFO L225 Difference]: With dead ends: 258 [2021-11-13 02:37:34,794 INFO L226 Difference]: Without dead ends: 256 [2021-11-13 02:37:34,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 788 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4646 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6206, Invalid=11884, Unknown=0, NotChecked=0, Total=18090 [2021-11-13 02:37:34,795 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 193 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 266.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.04ms SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 320.94ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:34,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 17 Invalid, 827 Unknown, 0 Unchecked, 2.04ms Time], IncrementalHoareTripleChecker [249 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 320.94ms Time] [2021-11-13 02:37:34,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-13 02:37:34,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 250. [2021-11-13 02:37:34,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.0080321285140563) internal successors, (251), 249 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:34,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 251 transitions. [2021-11-13 02:37:34,842 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 251 transitions. Word has length 246 [2021-11-13 02:37:34,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:34,842 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 251 transitions. [2021-11-13 02:37:34,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:34,843 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 251 transitions. [2021-11-13 02:37:34,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-13 02:37:34,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:34,843 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 1, 1, 1, 1] [2021-11-13 02:37:34,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-13 02:37:35,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2263,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:35,044 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:35,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:35,044 INFO L85 PathProgramCache]: Analyzing trace with hash 818585295, now seen corresponding path program 121 times [2021-11-13 02:37:35,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:35,044 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97058808] [2021-11-13 02:37:35,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:35,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:35,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:38,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:38,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:38,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97058808] [2021-11-13 02:37:38,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97058808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:38,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772189152] [2021-11-13 02:37:38,866 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:37:38,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:38,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:38,866 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:38,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-13 02:37:38,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:39,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-13 02:37:39,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:39,498 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:39,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:39,939 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:39,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772189152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:39,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874662076] [2021-11-13 02:37:39,939 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:39,940 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:39,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:39,940 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:39,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:39,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,941 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:39,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:39,942 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:39,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:39,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:39,945 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_128|], 10=[|v_#valid_129|]} [2021-11-13 02:37:39,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:39,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:39,949 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:39,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:39,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:39,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:39,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:39,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:39,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:39,958 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 23 treesize of output 22 [2021-11-13 02:37:39,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:39,959 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:39,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:39,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,961 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:39,962 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:39,963 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:39,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:37:39,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,978 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:39,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:37:39,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:39,996 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:39,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:39,999 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:40,001 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:37:40,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:40,009 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:40,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:40,014 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:40,615 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:40,615 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:40,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 126 [2021-11-13 02:37:40,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143656652] [2021-11-13 02:37:40,616 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:40,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-13 02:37:40,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:40,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-13 02:37:40,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4111, Invalid=13181, Unknown=0, NotChecked=0, Total=17292 [2021-11-13 02:37:40,618 INFO L87 Difference]: Start difference. First operand 250 states and 251 transitions. Second operand has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:43,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:43,331 INFO L93 Difference]: Finished difference Result 440 states and 442 transitions. [2021-11-13 02:37:43,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-13 02:37:43,331 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 249 [2021-11-13 02:37:43,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:43,331 INFO L225 Difference]: With dead ends: 440 [2021-11-13 02:37:43,331 INFO L226 Difference]: Without dead ends: 251 [2021-11-13 02:37:43,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 740 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6601 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=8141, Invalid=29301, Unknown=0, NotChecked=0, Total=37442 [2021-11-13 02:37:43,333 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 3 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 268.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.37ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 324.68ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:43,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 431 Invalid, 915 Unknown, 0 Unchecked, 2.37ms Time], IncrementalHoareTripleChecker [7 Valid, 908 Invalid, 0 Unknown, 0 Unchecked, 324.68ms Time] [2021-11-13 02:37:43,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-13 02:37:43,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-13 02:37:43,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.008) internal successors, (252), 250 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:43,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 252 transitions. [2021-11-13 02:37:43,381 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 252 transitions. Word has length 249 [2021-11-13 02:37:43,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:43,381 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 252 transitions. [2021-11-13 02:37:43,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:43,381 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 252 transitions. [2021-11-13 02:37:43,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-13 02:37:43,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:43,382 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 1, 1, 1, 1] [2021-11-13 02:37:43,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:43,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2282,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:43,582 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:43,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:43,583 INFO L85 PathProgramCache]: Analyzing trace with hash 756641414, now seen corresponding path program 122 times [2021-11-13 02:37:43,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:43,583 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486686849] [2021-11-13 02:37:43,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:43,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:43,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:45,113 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1891 proven. 5674 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:45,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:45,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486686849] [2021-11-13 02:37:45,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486686849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:45,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069488750] [2021-11-13 02:37:45,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:37:45,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:45,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:45,115 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:45,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-13 02:37:45,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-13 02:37:45,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:45,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-13 02:37:45,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:45,964 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:45,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:46,454 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:46,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069488750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:46,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1603966014] [2021-11-13 02:37:46,455 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:46,455 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:46,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:46,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:46,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:46,459 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,459 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:46,459 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:46,460 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:46,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:46,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:46,462 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_129|], 10=[|v_#valid_130|]} [2021-11-13 02:37:46,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:46,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:46,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:46,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:46,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:46,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,469 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:46,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:46,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:46,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:46,475 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 23 treesize of output 22 [2021-11-13 02:37:46,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:46,478 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:46,479 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:46,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,481 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:46,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:46,483 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:46,484 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,485 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:37:46,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,498 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:46,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:37:46,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,517 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:46,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:46,520 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:46,522 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:37:46,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:46,530 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:46,531 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:46,535 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:46,971 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:46,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:46,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 67 [2021-11-13 02:37:46,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028001408] [2021-11-13 02:37:46,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:46,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-13 02:37:46,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:46,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-13 02:37:46,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2109, Invalid=3147, Unknown=0, NotChecked=0, Total=5256 [2021-11-13 02:37:46,973 INFO L87 Difference]: Start difference. First operand 251 states and 252 transitions. Second operand has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:48,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:48,484 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2021-11-13 02:37:48,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-11-13 02:37:48,484 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 250 [2021-11-13 02:37:48,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:48,485 INFO L225 Difference]: With dead ends: 262 [2021-11-13 02:37:48,485 INFO L226 Difference]: Without dead ends: 260 [2021-11-13 02:37:48,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 801 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4784 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=6400, Invalid=12232, Unknown=0, NotChecked=0, Total=18632 [2021-11-13 02:37:48,486 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 197 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 674 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 289.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.17ms SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 349.99ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:48,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 18 Invalid, 926 Unknown, 0 Unchecked, 2.17ms Time], IncrementalHoareTripleChecker [252 Valid, 674 Invalid, 0 Unknown, 0 Unchecked, 349.99ms Time] [2021-11-13 02:37:48,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-13 02:37:48,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 254. [2021-11-13 02:37:48,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 253 states have (on average 1.007905138339921) internal successors, (255), 253 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:48,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 255 transitions. [2021-11-13 02:37:48,535 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 255 transitions. Word has length 250 [2021-11-13 02:37:48,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:48,536 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 255 transitions. [2021-11-13 02:37:48,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:48,536 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 255 transitions. [2021-11-13 02:37:48,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-11-13 02:37:48,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:48,536 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 62, 1, 1, 1, 1] [2021-11-13 02:37:48,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:48,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2301 [2021-11-13 02:37:48,737 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:48,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:48,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1120815347, now seen corresponding path program 123 times [2021-11-13 02:37:48,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:48,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210525034] [2021-11-13 02:37:48,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:48,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:48,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:52,695 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:52,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:52,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210525034] [2021-11-13 02:37:52,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210525034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:52,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610245960] [2021-11-13 02:37:52,696 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:37:52,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:52,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:52,697 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:52,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-13 02:37:52,845 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:37:52,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:52,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-13 02:37:52,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:53,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:53,787 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:53,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610245960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:53,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [359339900] [2021-11-13 02:37:53,788 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:37:53,788 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:53,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:37:53,788 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:37:53,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:37:53,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,790 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:53,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:37:53,791 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:37:53,791 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:37:53,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:37:53,793 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_130|], 10=[|v_#valid_131|]} [2021-11-13 02:37:53,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:53,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:37:53,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:53,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:37:53,798 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:53,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:53,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:53,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:53,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:37:53,806 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 23 treesize of output 22 [2021-11-13 02:37:53,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:53,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:37:53,808 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:37:53,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,810 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,810 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,811 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:37:53,811 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:37:53,811 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:37:53,812 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,813 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:37:53,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,827 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:37:53,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:37:53,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,845 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:37:53,845 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:37:53,848 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:37:53,850 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:37:53,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:37:53,858 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:37:53,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:37:53,863 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:37:54,488 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:37:54,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:54,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 128 [2021-11-13 02:37:54,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885010220] [2021-11-13 02:37:54,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:54,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2021-11-13 02:37:54,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:54,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-11-13 02:37:54,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4240, Invalid=13582, Unknown=0, NotChecked=0, Total=17822 [2021-11-13 02:37:54,491 INFO L87 Difference]: Start difference. First operand 254 states and 255 transitions. Second operand has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:57,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:57,431 INFO L93 Difference]: Finished difference Result 447 states and 449 transitions. [2021-11-13 02:37:57,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-13 02:37:57,431 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 253 [2021-11-13 02:37:57,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:57,431 INFO L225 Difference]: With dead ends: 447 [2021-11-13 02:37:57,431 INFO L226 Difference]: Without dead ends: 255 [2021-11-13 02:37:57,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 752 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6802 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=8398, Invalid=30214, Unknown=0, NotChecked=0, Total=38612 [2021-11-13 02:37:57,434 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 3 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 1346 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 369.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 653 SdHoareTripleChecker+Invalid, 1354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.19ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 448.55ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:57,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 653 Invalid, 1354 Unknown, 0 Unchecked, 3.19ms Time], IncrementalHoareTripleChecker [8 Valid, 1346 Invalid, 0 Unknown, 0 Unchecked, 448.55ms Time] [2021-11-13 02:37:57,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-13 02:37:57,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2021-11-13 02:37:57,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.0078740157480315) internal successors, (256), 254 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:57,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 256 transitions. [2021-11-13 02:37:57,483 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 256 transitions. Word has length 253 [2021-11-13 02:37:57,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:57,483 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 256 transitions. [2021-11-13 02:37:57,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:37:57,483 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 256 transitions. [2021-11-13 02:37:57,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-13 02:37:57,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:57,484 INFO L514 BasicCegarLoop]: trace histogram [63, 63, 62, 62, 1, 1, 1, 1] [2021-11-13 02:37:57,505 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2021-11-13 02:37:57,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2320 [2021-11-13 02:37:57,685 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:57,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:57,685 INFO L85 PathProgramCache]: Analyzing trace with hash -684694230, now seen corresponding path program 124 times [2021-11-13 02:37:57,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:57,685 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094088267] [2021-11-13 02:37:57,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:57,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:57,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:59,274 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 1953 proven. 5860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:59,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:59,274 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094088267] [2021-11-13 02:37:59,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094088267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:59,274 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452480654] [2021-11-13 02:37:59,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:37:59,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:59,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:59,275 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:59,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-13 02:37:59,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:59,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 977 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-13 02:37:59,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:59,937 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:37:59,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:00,423 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:00,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452480654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:00,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995145931] [2021-11-13 02:38:00,424 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:00,424 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:00,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:00,424 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:00,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:00,426 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,426 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:00,426 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:00,427 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:00,427 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:00,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:00,430 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_131|], 10=[|v_#valid_132|]} [2021-11-13 02:38:00,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:00,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:00,435 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,435 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:00,435 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,435 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:00,435 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:00,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,437 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:00,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:00,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:00,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:00,443 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 23 treesize of output 22 [2021-11-13 02:38:00,444 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:00,445 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:00,445 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:00,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,447 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,447 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,448 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:00,448 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:00,448 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:00,449 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,450 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:38:00,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:00,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:38:00,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,482 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:00,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:00,485 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:00,486 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:38:00,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:00,495 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:00,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:00,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:00,941 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:00,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:00,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 68 [2021-11-13 02:38:00,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873042130] [2021-11-13 02:38:00,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:00,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-13 02:38:00,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:00,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-13 02:38:00,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2174, Invalid=3228, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 02:38:00,942 INFO L87 Difference]: Start difference. First operand 255 states and 256 transitions. Second operand has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:02,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:02,477 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2021-11-13 02:38:02,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-11-13 02:38:02,477 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 254 [2021-11-13 02:38:02,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:02,478 INFO L225 Difference]: With dead ends: 266 [2021-11-13 02:38:02,478 INFO L226 Difference]: Without dead ends: 264 [2021-11-13 02:38:02,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 953 GetRequests, 814 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4924 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=6597, Invalid=12585, Unknown=0, NotChecked=0, Total=19182 [2021-11-13 02:38:02,479 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 197 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 279.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.25ms SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 337.35ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:02,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 15 Invalid, 866 Unknown, 0 Unchecked, 2.25ms Time], IncrementalHoareTripleChecker [257 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 337.35ms Time] [2021-11-13 02:38:02,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-13 02:38:02,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 258. [2021-11-13 02:38:02,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 257 states have (on average 1.0077821011673151) internal successors, (259), 257 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:02,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 259 transitions. [2021-11-13 02:38:02,530 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 259 transitions. Word has length 254 [2021-11-13 02:38:02,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:02,530 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 259 transitions. [2021-11-13 02:38:02,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:02,530 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 259 transitions. [2021-11-13 02:38:02,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-13 02:38:02,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:02,531 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 1, 1, 1, 1] [2021-11-13 02:38:02,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Ended with exit code 0 [2021-11-13 02:38:02,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2339,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:02,732 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:02,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:02,732 INFO L85 PathProgramCache]: Analyzing trace with hash -921296945, now seen corresponding path program 125 times [2021-11-13 02:38:02,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:02,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021914342] [2021-11-13 02:38:02,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:02,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:02,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:06,823 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:06,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:06,823 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021914342] [2021-11-13 02:38:06,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021914342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:06,824 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496824390] [2021-11-13 02:38:06,824 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:38:06,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:06,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:06,824 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:06,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-13 02:38:07,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-13 02:38:07,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:07,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-13 02:38:07,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:07,686 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:07,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:08,151 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:08,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496824390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:08,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392677530] [2021-11-13 02:38:08,153 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:08,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:08,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:08,153 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:08,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:08,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,155 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:08,155 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:08,155 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:08,156 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,156 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:08,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:08,158 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_132|], 10=[|v_#valid_133|]} [2021-11-13 02:38:08,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:08,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:08,162 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:08,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:08,163 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:08,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,165 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:08,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:08,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:08,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:08,171 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 23 treesize of output 22 [2021-11-13 02:38:08,171 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:08,173 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:08,173 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:08,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,174 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:08,176 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:08,176 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:08,177 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:38:08,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,191 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:08,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:38:08,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,209 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:08,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:08,213 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:08,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:38:08,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:08,223 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:08,224 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:08,227 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:08,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:08,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:08,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 130 [2021-11-13 02:38:08,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545367445] [2021-11-13 02:38:08,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:08,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-13 02:38:08,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:08,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-13 02:38:08,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=13989, Unknown=0, NotChecked=0, Total=18360 [2021-11-13 02:38:08,863 INFO L87 Difference]: Start difference. First operand 258 states and 259 transitions. Second operand has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:11,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:11,789 INFO L93 Difference]: Finished difference Result 454 states and 456 transitions. [2021-11-13 02:38:11,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-13 02:38:11,789 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 257 [2021-11-13 02:38:11,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:11,790 INFO L225 Difference]: With dead ends: 454 [2021-11-13 02:38:11,790 INFO L226 Difference]: Without dead ends: 259 [2021-11-13 02:38:11,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 764 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7006 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=8659, Invalid=31141, Unknown=0, NotChecked=0, Total=39800 [2021-11-13 02:38:11,792 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 3 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 1062 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 307.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.88ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1062 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 373.56ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:11,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 509 Invalid, 1070 Unknown, 0 Unchecked, 2.88ms Time], IncrementalHoareTripleChecker [8 Valid, 1062 Invalid, 0 Unknown, 0 Unchecked, 373.56ms Time] [2021-11-13 02:38:11,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-13 02:38:11,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-11-13 02:38:11,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 1.0077519379844961) internal successors, (260), 258 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:11,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2021-11-13 02:38:11,843 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 257 [2021-11-13 02:38:11,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:11,843 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2021-11-13 02:38:11,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:11,843 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2021-11-13 02:38:11,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-13 02:38:11,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:11,844 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 1, 1, 1, 1] [2021-11-13 02:38:11,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Ended with exit code 0 [2021-11-13 02:38:12,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2358,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:12,048 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:12,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:12,049 INFO L85 PathProgramCache]: Analyzing trace with hash -367966074, now seen corresponding path program 126 times [2021-11-13 02:38:12,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:12,049 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060843548] [2021-11-13 02:38:12,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:12,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:12,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:13,689 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2016 proven. 6049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:13,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:13,689 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060843548] [2021-11-13 02:38:13,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060843548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:13,689 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007811562] [2021-11-13 02:38:13,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:38:13,690 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:13,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:13,691 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:13,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-13 02:38:13,850 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:38:13,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:13,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 992 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-13 02:38:13,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:14,365 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:14,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:14,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007811562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:14,882 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893567308] [2021-11-13 02:38:14,883 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:14,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:14,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:14,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:14,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:14,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,885 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:14,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:14,886 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:14,886 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:14,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:14,888 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_133|], 10=[|v_#valid_134|]} [2021-11-13 02:38:14,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:14,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:14,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:14,893 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:14,893 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:14,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:14,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:14,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:14,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:14,901 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 23 treesize of output 22 [2021-11-13 02:38:14,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:14,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:14,903 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:14,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:14,906 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:14,906 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:14,907 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,908 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:38:14,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,921 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:14,924 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:38:14,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,939 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:14,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:14,943 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:14,944 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:38:14,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:14,953 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:14,954 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:14,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:15,402 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:15,402 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:15,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 69 [2021-11-13 02:38:15,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837402268] [2021-11-13 02:38:15,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:15,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-13 02:38:15,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:15,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-13 02:38:15,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2240, Invalid=3310, Unknown=0, NotChecked=0, Total=5550 [2021-11-13 02:38:15,405 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:17,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:17,017 INFO L93 Difference]: Finished difference Result 270 states and 271 transitions. [2021-11-13 02:38:17,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-11-13 02:38:17,018 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2021-11-13 02:38:17,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:17,019 INFO L225 Difference]: With dead ends: 270 [2021-11-13 02:38:17,019 INFO L226 Difference]: Without dead ends: 268 [2021-11-13 02:38:17,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 827 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5066 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=6797, Invalid=12943, Unknown=0, NotChecked=0, Total=19740 [2021-11-13 02:38:17,020 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 264 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 317.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1033 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.56ms SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 384.27ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:17,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 17 Invalid, 1033 Unknown, 0 Unchecked, 2.56ms Time], IncrementalHoareTripleChecker [324 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 384.27ms Time] [2021-11-13 02:38:17,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-13 02:38:17,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 262. [2021-11-13 02:38:17,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:17,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2021-11-13 02:38:17,074 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2021-11-13 02:38:17,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:17,075 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2021-11-13 02:38:17,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:17,075 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2021-11-13 02:38:17,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-11-13 02:38:17,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:17,076 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 64, 1, 1, 1, 1] [2021-11-13 02:38:17,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2021-11-13 02:38:17,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2377,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:17,280 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:17,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:17,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1315950861, now seen corresponding path program 127 times [2021-11-13 02:38:17,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:17,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498811787] [2021-11-13 02:38:17,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:17,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:21,476 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:21,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:21,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498811787] [2021-11-13 02:38:21,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498811787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:21,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320678969] [2021-11-13 02:38:21,477 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:38:21,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:21,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:21,478 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:21,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-13 02:38:21,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:21,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 1002 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-13 02:38:21,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:22,128 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:22,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:22,602 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:22,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320678969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:22,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1915921592] [2021-11-13 02:38:22,603 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:22,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:22,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:22,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:22,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:22,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,606 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:22,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:22,606 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:22,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:22,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:22,610 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_134|], 10=[|v_#valid_135|]} [2021-11-13 02:38:22,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:22,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:22,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:22,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:22,616 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:22,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,617 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:22,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:22,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:22,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:22,624 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 23 treesize of output 22 [2021-11-13 02:38:22,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:22,625 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:22,626 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:22,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,627 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,628 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,628 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:22,628 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:22,629 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:22,629 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,630 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:38:22,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,644 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:22,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:38:22,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,662 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:22,663 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:22,665 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:22,667 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:38:22,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:22,675 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:22,677 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:22,680 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:23,300 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:23,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:23,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [131, 131, 131] total 132 [2021-11-13 02:38:23,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704969133] [2021-11-13 02:38:23,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:23,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-13 02:38:23,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:23,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-13 02:38:23,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4504, Invalid=14402, Unknown=0, NotChecked=0, Total=18906 [2021-11-13 02:38:23,304 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:26,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:26,477 INFO L93 Difference]: Finished difference Result 461 states and 463 transitions. [2021-11-13 02:38:26,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-13 02:38:26,478 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 261 [2021-11-13 02:38:26,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:26,478 INFO L225 Difference]: With dead ends: 461 [2021-11-13 02:38:26,478 INFO L226 Difference]: Without dead ends: 263 [2021-11-13 02:38:26,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 776 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7213 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=8924, Invalid=32082, Unknown=0, NotChecked=0, Total=41006 [2021-11-13 02:38:26,480 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 3 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 1403 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 421.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 683 SdHoareTripleChecker+Invalid, 1411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.53ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 505.39ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:26,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 683 Invalid, 1411 Unknown, 0 Unchecked, 3.53ms Time], IncrementalHoareTripleChecker [8 Valid, 1403 Invalid, 0 Unknown, 0 Unchecked, 505.39ms Time] [2021-11-13 02:38:26,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-13 02:38:26,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2021-11-13 02:38:26,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0076335877862594) internal successors, (264), 262 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:26,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 264 transitions. [2021-11-13 02:38:26,533 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 264 transitions. Word has length 261 [2021-11-13 02:38:26,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:26,533 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 264 transitions. [2021-11-13 02:38:26,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:26,534 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 264 transitions. [2021-11-13 02:38:26,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-13 02:38:26,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:26,534 INFO L514 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 1, 1, 1, 1] [2021-11-13 02:38:26,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Ended with exit code 0 [2021-11-13 02:38:26,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2396,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:26,735 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:26,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:26,735 INFO L85 PathProgramCache]: Analyzing trace with hash 449455146, now seen corresponding path program 128 times [2021-11-13 02:38:26,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:26,735 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607645986] [2021-11-13 02:38:26,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:26,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:26,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:28,423 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2080 proven. 6241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:28,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:28,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607645986] [2021-11-13 02:38:28,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607645986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:28,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101389587] [2021-11-13 02:38:28,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:38:28,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:28,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:28,425 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:28,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2021-11-13 02:38:28,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2021-11-13 02:38:28,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:28,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 1007 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-13 02:38:28,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:29,355 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:29,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:29,861 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:29,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101389587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:29,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [247058415] [2021-11-13 02:38:29,862 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:29,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:29,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:29,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:29,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:29,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,866 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:29,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:29,867 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:29,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:29,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:29,877 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_135|], 10=[|v_#valid_136|]} [2021-11-13 02:38:29,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:29,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:29,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:29,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:29,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:29,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:29,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:29,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:29,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:29,899 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 23 treesize of output 22 [2021-11-13 02:38:29,899 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:29,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:29,901 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:29,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,903 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:29,904 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:29,904 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:29,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,906 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:38:29,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:29,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:38:29,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,939 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:29,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:29,946 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:29,948 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:38:29,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:29,961 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:29,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:29,965 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:30,414 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:30,414 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:30,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 70 [2021-11-13 02:38:30,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185536708] [2021-11-13 02:38:30,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:30,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-13 02:38:30,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:30,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-13 02:38:30,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2307, Invalid=3393, Unknown=0, NotChecked=0, Total=5700 [2021-11-13 02:38:30,416 INFO L87 Difference]: Start difference. First operand 263 states and 264 transitions. Second operand has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:32,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:32,052 INFO L93 Difference]: Finished difference Result 274 states and 275 transitions. [2021-11-13 02:38:32,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-13 02:38:32,052 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-13 02:38:32,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:32,053 INFO L225 Difference]: With dead ends: 274 [2021-11-13 02:38:32,053 INFO L226 Difference]: Without dead ends: 272 [2021-11-13 02:38:32,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 840 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5210 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=7000, Invalid=13306, Unknown=0, NotChecked=0, Total=20306 [2021-11-13 02:38:32,054 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 203 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 311.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.48ms SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 375.94ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:32,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 24 Invalid, 992 Unknown, 0 Unchecked, 2.48ms Time], IncrementalHoareTripleChecker [264 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 375.94ms Time] [2021-11-13 02:38:32,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-13 02:38:32,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 266. [2021-11-13 02:38:32,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:32,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2021-11-13 02:38:32,108 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 262 [2021-11-13 02:38:32,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:32,108 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2021-11-13 02:38:32,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:32,108 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2021-11-13 02:38:32,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-13 02:38:32,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:32,109 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 1, 1, 1, 1] [2021-11-13 02:38:32,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Forceful destruction successful, exit code 0 [2021-11-13 02:38:32,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2415 [2021-11-13 02:38:32,310 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:32,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:32,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1984954161, now seen corresponding path program 129 times [2021-11-13 02:38:32,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:32,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700315431] [2021-11-13 02:38:32,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:32,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:32,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:36,649 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:36,649 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:36,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700315431] [2021-11-13 02:38:36,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700315431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:36,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19133172] [2021-11-13 02:38:36,650 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:38:36,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:36,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:36,651 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:36,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-13 02:38:36,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:38:36,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:36,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 1017 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-13 02:38:36,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:37,372 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:37,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:37,856 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:37,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19133172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:37,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404088446] [2021-11-13 02:38:37,857 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:37,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:37,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:37,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:37,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:37,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,859 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:37,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:37,860 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:37,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:37,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:37,863 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_136|], 10=[|v_#valid_137|]} [2021-11-13 02:38:37,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:37,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:37,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:37,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:37,869 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:37,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,870 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:37,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:37,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:37,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:37,877 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 23 treesize of output 22 [2021-11-13 02:38:37,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:37,879 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,879 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:37,879 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:37,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,880 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:37,882 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:37,882 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:37,883 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,884 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:38:37,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,897 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:37,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:38:37,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,915 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:37,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:37,919 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:37,920 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:38:37,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:37,929 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:37,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:37,933 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:38,577 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:38,577 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:38,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133, 133] total 134 [2021-11-13 02:38:38,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903663405] [2021-11-13 02:38:38,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:38,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2021-11-13 02:38:38,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:38,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-11-13 02:38:38,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4639, Invalid=14821, Unknown=0, NotChecked=0, Total=19460 [2021-11-13 02:38:38,579 INFO L87 Difference]: Start difference. First operand 266 states and 267 transitions. Second operand has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:41,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:41,771 INFO L93 Difference]: Finished difference Result 468 states and 470 transitions. [2021-11-13 02:38:41,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-13 02:38:41,772 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 265 [2021-11-13 02:38:41,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:41,772 INFO L225 Difference]: With dead ends: 468 [2021-11-13 02:38:41,772 INFO L226 Difference]: Without dead ends: 267 [2021-11-13 02:38:41,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 788 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7423 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=9193, Invalid=33037, Unknown=0, NotChecked=0, Total=42230 [2021-11-13 02:38:41,775 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 3 mSDsluCounter, 618 mSDsCounter, 0 mSdLazyCounter, 1408 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 388.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 685 SdHoareTripleChecker+Invalid, 1415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.40ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 472.26ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:41,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 685 Invalid, 1415 Unknown, 0 Unchecked, 3.40ms Time], IncrementalHoareTripleChecker [7 Valid, 1408 Invalid, 0 Unknown, 0 Unchecked, 472.26ms Time] [2021-11-13 02:38:41,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-13 02:38:41,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-11-13 02:38:41,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.0075187969924813) internal successors, (268), 266 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:41,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2021-11-13 02:38:41,844 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 265 [2021-11-13 02:38:41,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:41,844 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2021-11-13 02:38:41,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:41,844 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2021-11-13 02:38:41,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-13 02:38:41,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:41,845 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 1, 1, 1, 1] [2021-11-13 02:38:41,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-13 02:38:42,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2434 [2021-11-13 02:38:42,045 INFO L402 AbstractCegarLoop]: === Iteration 132 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:42,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:42,046 INFO L85 PathProgramCache]: Analyzing trace with hash 770605702, now seen corresponding path program 130 times [2021-11-13 02:38:42,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:42,046 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147147738] [2021-11-13 02:38:42,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:42,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:42,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:43,781 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2145 proven. 6436 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:43,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:43,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147147738] [2021-11-13 02:38:43,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147147738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:43,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616940730] [2021-11-13 02:38:43,782 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:38:43,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:43,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:43,783 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:43,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-13 02:38:43,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:43,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 1022 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-13 02:38:43,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:44,453 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:44,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:44,975 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:44,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616940730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:44,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [268154321] [2021-11-13 02:38:44,975 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:44,975 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:44,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:44,976 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:44,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:44,978 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,979 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:44,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:44,979 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:44,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:44,981 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:44,982 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_137|], 10=[|v_#valid_138|]} [2021-11-13 02:38:44,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:44,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:44,986 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:44,987 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:44,987 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:44,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:44,989 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:44,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:44,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:44,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:44,995 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 23 treesize of output 22 [2021-11-13 02:38:44,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:44,997 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:44,997 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:44,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:44,999 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:44,999 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:45,000 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:45,000 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:45,000 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:45,001 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:45,002 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:38:45,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:45,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:38:45,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,034 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:45,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:45,038 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:45,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:38:45,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:45,048 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:45,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:45,052 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:45,504 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:45,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:45,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 71 [2021-11-13 02:38:45,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638857439] [2021-11-13 02:38:45,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:45,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-13 02:38:45,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:45,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-13 02:38:45,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2375, Invalid=3477, Unknown=0, NotChecked=0, Total=5852 [2021-11-13 02:38:45,506 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:47,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:47,158 INFO L93 Difference]: Finished difference Result 278 states and 279 transitions. [2021-11-13 02:38:47,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-13 02:38:47,159 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 266 [2021-11-13 02:38:47,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:47,159 INFO L225 Difference]: With dead ends: 278 [2021-11-13 02:38:47,159 INFO L226 Difference]: Without dead ends: 276 [2021-11-13 02:38:47,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 998 GetRequests, 853 SyntacticMatches, 2 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5356 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7206, Invalid=13674, Unknown=0, NotChecked=0, Total=20880 [2021-11-13 02:38:47,161 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 142 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 289.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.31ms SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 349.54ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:47,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 12 Invalid, 880 Unknown, 0 Unchecked, 2.31ms Time], IncrementalHoareTripleChecker [203 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 349.54ms Time] [2021-11-13 02:38:47,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-13 02:38:47,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 270. [2021-11-13 02:38:47,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 269 states have (on average 1.0074349442379182) internal successors, (271), 269 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:47,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 271 transitions. [2021-11-13 02:38:47,216 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 271 transitions. Word has length 266 [2021-11-13 02:38:47,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:47,217 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 271 transitions. [2021-11-13 02:38:47,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:47,217 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 271 transitions. [2021-11-13 02:38:47,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-11-13 02:38:47,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:47,218 INFO L514 BasicCegarLoop]: trace histogram [67, 66, 66, 66, 1, 1, 1, 1] [2021-11-13 02:38:47,239 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Ended with exit code 0 [2021-11-13 02:38:47,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2453 [2021-11-13 02:38:47,418 INFO L402 AbstractCegarLoop]: === Iteration 133 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:47,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:47,418 INFO L85 PathProgramCache]: Analyzing trace with hash 519091443, now seen corresponding path program 131 times [2021-11-13 02:38:47,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:47,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411533704] [2021-11-13 02:38:47,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:47,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:47,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:51,890 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:51,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:51,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411533704] [2021-11-13 02:38:51,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411533704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:51,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578169100] [2021-11-13 02:38:51,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:38:51,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:51,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:51,915 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:51,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2021-11-13 02:38:52,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 67 check-sat command(s) [2021-11-13 02:38:52,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:52,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-13 02:38:52,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:52,862 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:52,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:53,367 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:53,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578169100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:53,367 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317830390] [2021-11-13 02:38:53,368 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:38:53,368 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:53,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:38:53,368 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:38:53,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:38:53,370 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,370 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:53,370 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,371 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:38:53,371 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:38:53,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,371 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:38:53,372 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:38:53,373 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_138|], 10=[|v_#valid_139|]} [2021-11-13 02:38:53,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:53,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:38:53,378 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:53,378 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:38:53,378 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:53,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,380 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:53,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:53,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:53,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:38:53,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:38:53,386 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,387 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:53,388 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:38:53,388 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:38:53,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,390 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:38:53,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:38:53,391 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:38:53,392 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:38:53,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,406 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:38:53,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:38:53,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,424 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:38:53,425 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:38:53,428 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:38:53,429 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:38:53,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:38:53,440 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:38:53,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:38:53,444 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:38:54,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:38:54,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:54,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [135, 135, 135] total 136 [2021-11-13 02:38:54,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041679875] [2021-11-13 02:38:54,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:54,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-13 02:38:54,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:54,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-13 02:38:54,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4776, Invalid=15246, Unknown=0, NotChecked=0, Total=20022 [2021-11-13 02:38:54,080 INFO L87 Difference]: Start difference. First operand 270 states and 271 transitions. Second operand has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:57,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:57,609 INFO L93 Difference]: Finished difference Result 475 states and 477 transitions. [2021-11-13 02:38:57,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-13 02:38:57,610 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 269 [2021-11-13 02:38:57,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:57,610 INFO L225 Difference]: With dead ends: 475 [2021-11-13 02:38:57,610 INFO L226 Difference]: Without dead ends: 271 [2021-11-13 02:38:57,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1007 GetRequests, 800 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7636 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=9466, Invalid=34006, Unknown=0, NotChecked=0, Total=43472 [2021-11-13 02:38:57,613 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 3 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 1988 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 519.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 964 SdHoareTripleChecker+Invalid, 1993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.49ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 633.60ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:57,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 964 Invalid, 1993 Unknown, 0 Unchecked, 4.49ms Time], IncrementalHoareTripleChecker [5 Valid, 1988 Invalid, 0 Unknown, 0 Unchecked, 633.60ms Time] [2021-11-13 02:38:57,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-13 02:38:57,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 271. [2021-11-13 02:38:57,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.0074074074074073) internal successors, (272), 270 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:57,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 272 transitions. [2021-11-13 02:38:57,668 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 272 transitions. Word has length 269 [2021-11-13 02:38:57,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:57,668 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 272 transitions. [2021-11-13 02:38:57,668 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:38:57,669 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 272 transitions. [2021-11-13 02:38:57,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-13 02:38:57,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:57,669 INFO L514 BasicCegarLoop]: trace histogram [67, 67, 66, 66, 1, 1, 1, 1] [2021-11-13 02:38:57,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Ended with exit code 0 [2021-11-13 02:38:57,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2472,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:57,870 INFO L402 AbstractCegarLoop]: === Iteration 134 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:57,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:57,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1743158486, now seen corresponding path program 132 times [2021-11-13 02:38:57,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:57,870 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958007480] [2021-11-13 02:38:57,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:57,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:57,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:59,649 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2211 proven. 6634 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:38:59,649 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:59,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958007480] [2021-11-13 02:38:59,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958007480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:59,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052560292] [2021-11-13 02:38:59,650 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:38:59,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:59,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:59,650 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:59,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-13 02:38:59,813 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:38:59,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:59,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 1037 conjuncts, 137 conjunts are in the unsatisfiable core [2021-11-13 02:38:59,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:00,367 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:00,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:00,888 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:00,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052560292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:00,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [471519868] [2021-11-13 02:39:00,889 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:00,889 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:00,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:00,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:00,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:00,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,891 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:00,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:00,892 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:00,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:00,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:00,898 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_139|], 10=[|v_#valid_140|]} [2021-11-13 02:39:00,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:00,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:00,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:00,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:00,903 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:00,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,905 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:00,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:00,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:00,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:00,911 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 23 treesize of output 22 [2021-11-13 02:39:00,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:00,913 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:00,913 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:00,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,915 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:00,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:00,916 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:00,917 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-13 02:39:00,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,932 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:00,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:39:00,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,950 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:00,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:00,953 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:00,955 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:39:00,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:00,963 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:00,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:00,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:01,423 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:01,423 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:01,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 72 [2021-11-13 02:39:01,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976028204] [2021-11-13 02:39:01,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:01,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-13 02:39:01,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:01,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-13 02:39:01,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2444, Invalid=3562, Unknown=0, NotChecked=0, Total=6006 [2021-11-13 02:39:01,424 INFO L87 Difference]: Start difference. First operand 271 states and 272 transitions. Second operand has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:03,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:03,121 INFO L93 Difference]: Finished difference Result 282 states and 283 transitions. [2021-11-13 02:39:03,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-11-13 02:39:03,121 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 270 [2021-11-13 02:39:03,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:03,122 INFO L225 Difference]: With dead ends: 282 [2021-11-13 02:39:03,122 INFO L226 Difference]: Without dead ends: 280 [2021-11-13 02:39:03,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1013 GetRequests, 866 SyntacticMatches, 2 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5504 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=7415, Invalid=14047, Unknown=0, NotChecked=0, Total=21462 [2021-11-13 02:39:03,123 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 210 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 696 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 308.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.47ms SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 372.43ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:03,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 19 Invalid, 969 Unknown, 0 Unchecked, 2.47ms Time], IncrementalHoareTripleChecker [273 Valid, 696 Invalid, 0 Unknown, 0 Unchecked, 372.43ms Time] [2021-11-13 02:39:03,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-13 02:39:03,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 274. [2021-11-13 02:39:03,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 273 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:03,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2021-11-13 02:39:03,180 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 270 [2021-11-13 02:39:03,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:03,181 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2021-11-13 02:39:03,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:03,181 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2021-11-13 02:39:03,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-13 02:39:03,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:03,182 INFO L514 BasicCegarLoop]: trace histogram [68, 67, 67, 67, 1, 1, 1, 1] [2021-11-13 02:39:03,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Forceful destruction successful, exit code 0 [2021-11-13 02:39:03,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2491,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:03,382 INFO L402 AbstractCegarLoop]: === Iteration 135 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:03,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:03,383 INFO L85 PathProgramCache]: Analyzing trace with hash 19939791, now seen corresponding path program 133 times [2021-11-13 02:39:03,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:03,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219939263] [2021-11-13 02:39:03,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:03,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:07,983 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:07,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:07,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219939263] [2021-11-13 02:39:07,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219939263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:07,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538151253] [2021-11-13 02:39:07,984 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:39:07,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:07,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:07,985 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:07,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-13 02:39:08,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:08,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 1047 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-13 02:39:08,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:08,655 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:08,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:09,199 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:09,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538151253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:09,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512844420] [2021-11-13 02:39:09,201 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:09,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:09,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:09,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:09,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:09,205 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,205 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:09,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:09,207 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:09,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:09,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:09,210 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_140|], 10=[|v_#valid_141|]} [2021-11-13 02:39:09,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:09,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:09,216 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:09,217 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:09,217 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:09,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,220 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:09,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:09,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:09,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:09,228 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 23 treesize of output 22 [2021-11-13 02:39:09,229 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:09,231 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:09,231 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:09,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,234 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,234 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,236 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:09,236 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:09,236 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:09,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,239 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:39:09,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:09,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:39:09,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,286 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:09,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:09,289 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:09,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:39:09,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:09,299 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:09,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:09,304 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:09,944 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:09,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:09,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 137, 137] total 138 [2021-11-13 02:39:09,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291060117] [2021-11-13 02:39:09,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:09,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2021-11-13 02:39:09,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:09,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-11-13 02:39:09,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4915, Invalid=15677, Unknown=0, NotChecked=0, Total=20592 [2021-11-13 02:39:09,947 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand has 139 states, 139 states have (on average 1.9784172661870503) internal successors, (275), 138 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:13,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:13,338 INFO L93 Difference]: Finished difference Result 482 states and 484 transitions. [2021-11-13 02:39:13,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2021-11-13 02:39:13,338 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.9784172661870503) internal successors, (275), 138 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 273 [2021-11-13 02:39:13,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:13,339 INFO L225 Difference]: With dead ends: 482 [2021-11-13 02:39:13,339 INFO L226 Difference]: Without dead ends: 275 [2021-11-13 02:39:13,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1022 GetRequests, 812 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7852 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=9743, Invalid=34989, Unknown=0, NotChecked=0, Total=44732 [2021-11-13 02:39:13,341 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 3 mSDsluCounter, 622 mSDsCounter, 0 mSdLazyCounter, 1438 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 397.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 1445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.50ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 483.32ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:13,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 691 Invalid, 1445 Unknown, 0 Unchecked, 3.50ms Time], IncrementalHoareTripleChecker [7 Valid, 1438 Invalid, 0 Unknown, 0 Unchecked, 483.32ms Time] [2021-11-13 02:39:13,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-13 02:39:13,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2021-11-13 02:39:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.0072992700729928) internal successors, (276), 274 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:13,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 276 transitions. [2021-11-13 02:39:13,398 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 276 transitions. Word has length 273 [2021-11-13 02:39:13,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:13,398 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 276 transitions. [2021-11-13 02:39:13,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.9784172661870503) internal successors, (275), 138 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:13,398 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 276 transitions. [2021-11-13 02:39:13,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-13 02:39:13,399 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:13,399 INFO L514 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 1, 1, 1, 1] [2021-11-13 02:39:13,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Forceful destruction successful, exit code 0 [2021-11-13 02:39:13,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2510 [2021-11-13 02:39:13,600 INFO L402 AbstractCegarLoop]: === Iteration 136 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:13,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:13,600 INFO L85 PathProgramCache]: Analyzing trace with hash 4791430, now seen corresponding path program 134 times [2021-11-13 02:39:13,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:13,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19938943] [2021-11-13 02:39:13,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:13,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:13,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:15,447 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2278 proven. 6835 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:15,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:15,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19938943] [2021-11-13 02:39:15,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19938943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:15,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956151481] [2021-11-13 02:39:15,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:39:15,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:15,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:15,448 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:15,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Waiting until timeout for monitored process [2021-11-13 02:39:15,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2021-11-13 02:39:15,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:39:15,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 139 conjunts are in the unsatisfiable core [2021-11-13 02:39:15,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:16,442 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2346 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:16,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:17,005 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2346 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:17,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956151481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:17,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1288317359] [2021-11-13 02:39:17,006 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:17,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:17,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:17,006 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:17,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:17,026 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,027 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:17,027 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,027 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:17,028 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:17,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:17,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:17,030 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_141|], 10=[|v_#valid_142|]} [2021-11-13 02:39:17,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:17,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:17,036 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:17,037 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,037 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:17,037 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:17,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:17,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:17,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:17,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:17,046 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 23 treesize of output 22 [2021-11-13 02:39:17,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:17,048 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:17,049 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:17,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,051 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:17,052 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:17,053 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:17,054 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:39:17,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,072 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:17,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:39:17,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,095 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:17,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:17,100 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:17,101 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:39:17,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:17,113 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:17,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:17,118 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:17,603 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:17,604 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:17,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 73 [2021-11-13 02:39:17,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786062625] [2021-11-13 02:39:17,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:17,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-13 02:39:17,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:17,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-13 02:39:17,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2514, Invalid=3648, Unknown=0, NotChecked=0, Total=6162 [2021-11-13 02:39:17,606 INFO L87 Difference]: Start difference. First operand 275 states and 276 transitions. Second operand has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:19,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:19,379 INFO L93 Difference]: Finished difference Result 286 states and 287 transitions. [2021-11-13 02:39:19,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2021-11-13 02:39:19,379 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 274 [2021-11-13 02:39:19,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:19,379 INFO L225 Difference]: With dead ends: 286 [2021-11-13 02:39:19,380 INFO L226 Difference]: Without dead ends: 284 [2021-11-13 02:39:19,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 879 SyntacticMatches, 2 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5654 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=7627, Invalid=14425, Unknown=0, NotChecked=0, Total=22052 [2021-11-13 02:39:19,381 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 282 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 330.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.84ms SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 400.62ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:19,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 17 Invalid, 1049 Unknown, 0 Unchecked, 2.84ms Time], IncrementalHoareTripleChecker [344 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 400.62ms Time] [2021-11-13 02:39:19,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-11-13 02:39:19,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 278. [2021-11-13 02:39:19,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 1.0072202166064983) internal successors, (279), 277 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:19,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 279 transitions. [2021-11-13 02:39:19,440 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 279 transitions. Word has length 274 [2021-11-13 02:39:19,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:19,440 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 279 transitions. [2021-11-13 02:39:19,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:19,441 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 279 transitions. [2021-11-13 02:39:19,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2021-11-13 02:39:19,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:19,442 INFO L514 BasicCegarLoop]: trace histogram [69, 68, 68, 68, 1, 1, 1, 1] [2021-11-13 02:39:19,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Ended with exit code 0 [2021-11-13 02:39:19,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2529,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:19,656 INFO L402 AbstractCegarLoop]: === Iteration 137 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:19,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:19,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1012390643, now seen corresponding path program 135 times [2021-11-13 02:39:19,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:19,657 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638379769] [2021-11-13 02:39:19,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:19,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:19,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:24,363 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6970 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:24,363 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:24,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638379769] [2021-11-13 02:39:24,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638379769] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:24,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900462971] [2021-11-13 02:39:24,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:39:24,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:24,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:24,364 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:24,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-13 02:39:24,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:39:24,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:39:24,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 1062 conjuncts, 140 conjunts are in the unsatisfiable core [2021-11-13 02:39:24,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:25,074 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6970 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:25,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:25,597 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6970 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:25,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900462971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:25,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [30706433] [2021-11-13 02:39:25,598 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:25,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:25,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:25,598 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:25,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:25,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,600 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:25,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:25,601 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:25,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:25,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:25,604 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_142|], 10=[|v_#valid_143|]} [2021-11-13 02:39:25,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:25,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:25,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:25,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:25,610 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:25,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,611 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:25,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:25,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:25,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:25,618 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 23 treesize of output 22 [2021-11-13 02:39:25,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:25,619 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:25,620 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:25,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,622 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,622 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:25,622 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:25,622 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:25,623 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,624 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:39:25,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,649 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:25,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:39:25,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,667 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:25,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:25,671 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:25,672 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:39:25,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:25,681 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:25,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:25,685 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:26,331 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:26,331 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:26,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [139, 139, 139] total 140 [2021-11-13 02:39:26,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025171670] [2021-11-13 02:39:26,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:26,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2021-11-13 02:39:26,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:26,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-11-13 02:39:26,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5056, Invalid=16114, Unknown=0, NotChecked=0, Total=21170 [2021-11-13 02:39:26,334 INFO L87 Difference]: Start difference. First operand 278 states and 279 transitions. Second operand has 141 states, 141 states have (on average 1.9787234042553192) internal successors, (279), 140 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:29,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:29,798 INFO L93 Difference]: Finished difference Result 489 states and 491 transitions. [2021-11-13 02:39:29,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-11-13 02:39:29,798 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.9787234042553192) internal successors, (279), 140 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 277 [2021-11-13 02:39:29,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:29,799 INFO L225 Difference]: With dead ends: 489 [2021-11-13 02:39:29,799 INFO L226 Difference]: Without dead ends: 279 [2021-11-13 02:39:29,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1037 GetRequests, 824 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8071 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=10024, Invalid=35986, Unknown=0, NotChecked=0, Total=46010 [2021-11-13 02:39:29,801 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 3 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 1312 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 387.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 636 SdHoareTripleChecker+Invalid, 1321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.48ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 468.17ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:29,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 636 Invalid, 1321 Unknown, 0 Unchecked, 3.48ms Time], IncrementalHoareTripleChecker [9 Valid, 1312 Invalid, 0 Unknown, 0 Unchecked, 468.17ms Time] [2021-11-13 02:39:29,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-13 02:39:29,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2021-11-13 02:39:29,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0071942446043165) internal successors, (280), 278 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:29,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2021-11-13 02:39:29,860 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 277 [2021-11-13 02:39:29,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:29,860 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2021-11-13 02:39:29,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.9787234042553192) internal successors, (279), 140 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:29,860 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2021-11-13 02:39:29,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-13 02:39:29,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:29,861 INFO L514 BasicCegarLoop]: trace histogram [69, 69, 68, 68, 1, 1, 1, 1] [2021-11-13 02:39:29,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2021-11-13 02:39:30,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2548,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:30,062 INFO L402 AbstractCegarLoop]: === Iteration 138 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:30,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:30,062 INFO L85 PathProgramCache]: Analyzing trace with hash -108625366, now seen corresponding path program 136 times [2021-11-13 02:39:30,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:30,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205886764] [2021-11-13 02:39:30,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:30,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:30,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2346 proven. 7039 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:31,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:31,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205886764] [2021-11-13 02:39:31,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205886764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:31,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738321604] [2021-11-13 02:39:31,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:39:31,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:31,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:31,933 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:31,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-13 02:39:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:32,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 1067 conjuncts, 141 conjunts are in the unsatisfiable core [2021-11-13 02:39:32,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:32,639 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2415 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:32,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2415 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:33,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738321604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:33,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [628683073] [2021-11-13 02:39:33,187 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:33,188 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:33,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:33,188 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:33,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:33,193 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,193 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:33,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:33,194 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:33,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:33,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:33,196 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_143|], 10=[|v_#valid_144|]} [2021-11-13 02:39:33,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:33,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:33,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:33,202 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:33,202 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:33,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,203 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:33,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:33,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:33,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:33,212 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 23 treesize of output 22 [2021-11-13 02:39:33,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:33,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:33,214 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:33,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,216 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:33,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:33,217 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:33,218 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,219 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-11-13 02:39:33,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,232 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:33,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:39:33,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,251 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:33,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:33,255 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:33,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:39:33,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:33,265 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:33,266 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:33,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:33,730 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:33,730 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:33,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 74 [2021-11-13 02:39:33,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682652362] [2021-11-13 02:39:33,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:33,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-13 02:39:33,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:33,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-13 02:39:33,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2585, Invalid=3735, Unknown=0, NotChecked=0, Total=6320 [2021-11-13 02:39:33,731 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:35,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:35,531 INFO L93 Difference]: Finished difference Result 290 states and 291 transitions. [2021-11-13 02:39:35,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-11-13 02:39:35,532 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 278 [2021-11-13 02:39:35,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:35,532 INFO L225 Difference]: With dead ends: 290 [2021-11-13 02:39:35,532 INFO L226 Difference]: Without dead ends: 288 [2021-11-13 02:39:35,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 892 SyntacticMatches, 2 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5806 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=7842, Invalid=14808, Unknown=0, NotChecked=0, Total=22650 [2021-11-13 02:39:35,534 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 147 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 333.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.42ms SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 399.54ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:35,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 18 Invalid, 981 Unknown, 0 Unchecked, 2.42ms Time], IncrementalHoareTripleChecker [212 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 399.54ms Time] [2021-11-13 02:39:35,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-13 02:39:35,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 282. [2021-11-13 02:39:35,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 281 states have (on average 1.00711743772242) internal successors, (283), 281 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:35,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 283 transitions. [2021-11-13 02:39:35,596 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 283 transitions. Word has length 278 [2021-11-13 02:39:35,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:35,596 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 283 transitions. [2021-11-13 02:39:35,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:35,596 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 283 transitions. [2021-11-13 02:39:35,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-11-13 02:39:35,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:35,597 INFO L514 BasicCegarLoop]: trace histogram [70, 69, 69, 69, 1, 1, 1, 1] [2021-11-13 02:39:35,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Forceful destruction successful, exit code 0 [2021-11-13 02:39:35,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2567,138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:35,798 INFO L402 AbstractCegarLoop]: === Iteration 139 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:35,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:35,798 INFO L85 PathProgramCache]: Analyzing trace with hash -1943084337, now seen corresponding path program 137 times [2021-11-13 02:39:35,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:35,798 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435050549] [2021-11-13 02:39:35,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:35,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:35,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:40,677 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 7176 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:40,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:40,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435050549] [2021-11-13 02:39:40,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435050549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:40,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916840351] [2021-11-13 02:39:40,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:39:40,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:40,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:40,678 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:40,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Waiting until timeout for monitored process [2021-11-13 02:39:41,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 70 check-sat command(s) [2021-11-13 02:39:41,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:39:41,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 1077 conjuncts, 142 conjunts are in the unsatisfiable core [2021-11-13 02:39:41,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:41,693 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 7176 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:41,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 7176 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:42,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916840351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:42,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1867372299] [2021-11-13 02:39:42,232 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:42,232 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:42,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:42,233 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:42,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:42,242 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,242 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:42,242 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:42,243 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:42,243 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,244 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:42,244 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:42,245 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_144|], 10=[|v_#valid_145|]} [2021-11-13 02:39:42,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:42,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:42,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,251 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:42,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:42,252 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:42,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,253 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:42,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:42,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:42,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:42,261 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 23 treesize of output 22 [2021-11-13 02:39:42,261 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:42,263 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:42,263 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:42,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,265 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,265 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,266 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:42,266 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:42,266 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:42,267 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,268 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:39:42,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,285 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:42,288 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:39:42,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,306 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:42,307 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:42,310 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:42,319 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:39:42,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:42,329 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:42,330 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:42,333 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:43,014 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:43,014 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:43,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [141, 141, 141] total 142 [2021-11-13 02:39:43,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678288917] [2021-11-13 02:39:43,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:43,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-13 02:39:43,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:43,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-13 02:39:43,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5199, Invalid=16557, Unknown=0, NotChecked=0, Total=21756 [2021-11-13 02:39:43,016 INFO L87 Difference]: Start difference. First operand 282 states and 283 transitions. Second operand has 143 states, 143 states have (on average 1.979020979020979) internal successors, (283), 142 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:46,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:46,484 INFO L93 Difference]: Finished difference Result 496 states and 498 transitions. [2021-11-13 02:39:46,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-13 02:39:46,484 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 1.979020979020979) internal successors, (283), 142 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 281 [2021-11-13 02:39:46,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:46,485 INFO L225 Difference]: With dead ends: 496 [2021-11-13 02:39:46,485 INFO L226 Difference]: Without dead ends: 283 [2021-11-13 02:39:46,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 836 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8293 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=10309, Invalid=36997, Unknown=0, NotChecked=0, Total=47306 [2021-11-13 02:39:46,487 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 3 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 1173 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 361.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 1177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.27ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 435.94ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:46,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 565 Invalid, 1177 Unknown, 0 Unchecked, 3.27ms Time], IncrementalHoareTripleChecker [4 Valid, 1173 Invalid, 0 Unknown, 0 Unchecked, 435.94ms Time] [2021-11-13 02:39:46,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-13 02:39:46,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 283. [2021-11-13 02:39:46,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0070921985815602) internal successors, (284), 282 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:46,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 284 transitions. [2021-11-13 02:39:46,548 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 284 transitions. Word has length 281 [2021-11-13 02:39:46,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:46,548 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 284 transitions. [2021-11-13 02:39:46,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 1.979020979020979) internal successors, (283), 142 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:46,548 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 284 transitions. [2021-11-13 02:39:46,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-13 02:39:46,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:46,549 INFO L514 BasicCegarLoop]: trace histogram [70, 70, 69, 69, 1, 1, 1, 1] [2021-11-13 02:39:46,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Ended with exit code 0 [2021-11-13 02:39:46,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2586,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:46,750 INFO L402 AbstractCegarLoop]: === Iteration 140 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:46,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:46,750 INFO L85 PathProgramCache]: Analyzing trace with hash 918099590, now seen corresponding path program 138 times [2021-11-13 02:39:46,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:46,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045968304] [2021-11-13 02:39:46,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:46,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:46,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:48,693 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2415 proven. 7246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:48,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:48,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045968304] [2021-11-13 02:39:48,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045968304] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:48,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470834186] [2021-11-13 02:39:48,694 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:39:48,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:48,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:48,695 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:48,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2021-11-13 02:39:48,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:39:48,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:39:48,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 1082 conjuncts, 143 conjunts are in the unsatisfiable core [2021-11-13 02:39:48,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:49,430 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2485 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:49,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:50,001 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2485 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:50,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470834186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:50,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159607184] [2021-11-13 02:39:50,001 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:50,001 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:50,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:50,002 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:50,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:50,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,024 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:50,024 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:50,025 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:50,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:50,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:50,027 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_145|], 10=[|v_#valid_146|]} [2021-11-13 02:39:50,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:50,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:50,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,032 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:50,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,032 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:50,032 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:50,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,034 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:50,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:50,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:50,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:50,040 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 23 treesize of output 22 [2021-11-13 02:39:50,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:50,042 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:50,042 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:50,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:50,045 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:50,045 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:50,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:39:50,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:50,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:39:50,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,077 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:50,078 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:50,081 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:50,082 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:39:50,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:50,091 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:50,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:50,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:50,560 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:50,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:50,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 75 [2021-11-13 02:39:50,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272466704] [2021-11-13 02:39:50,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:50,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-13 02:39:50,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:50,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-13 02:39:50,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2657, Invalid=3823, Unknown=0, NotChecked=0, Total=6480 [2021-11-13 02:39:50,562 INFO L87 Difference]: Start difference. First operand 283 states and 284 transitions. Second operand has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:52,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:52,438 INFO L93 Difference]: Finished difference Result 294 states and 295 transitions. [2021-11-13 02:39:52,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-11-13 02:39:52,438 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 282 [2021-11-13 02:39:52,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:52,439 INFO L225 Difference]: With dead ends: 294 [2021-11-13 02:39:52,439 INFO L226 Difference]: Without dead ends: 292 [2021-11-13 02:39:52,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 905 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5960 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=8060, Invalid=15196, Unknown=0, NotChecked=0, Total=23256 [2021-11-13 02:39:52,440 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 219 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 863 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 353.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.81ms SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 863 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 427.54ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:52,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 24 Invalid, 1147 Unknown, 0 Unchecked, 2.81ms Time], IncrementalHoareTripleChecker [284 Valid, 863 Invalid, 0 Unknown, 0 Unchecked, 427.54ms Time] [2021-11-13 02:39:52,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-11-13 02:39:52,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 286. [2021-11-13 02:39:52,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 285 states have (on average 1.0070175438596491) internal successors, (287), 285 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:52,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 287 transitions. [2021-11-13 02:39:52,503 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 287 transitions. Word has length 282 [2021-11-13 02:39:52,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:52,504 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 287 transitions. [2021-11-13 02:39:52,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:39:52,504 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 287 transitions. [2021-11-13 02:39:52,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-11-13 02:39:52,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:52,505 INFO L514 BasicCegarLoop]: trace histogram [71, 70, 70, 70, 1, 1, 1, 1] [2021-11-13 02:39:52,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2021-11-13 02:39:52,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2605 [2021-11-13 02:39:52,705 INFO L402 AbstractCegarLoop]: === Iteration 141 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:52,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:52,705 INFO L85 PathProgramCache]: Analyzing trace with hash 757965043, now seen corresponding path program 139 times [2021-11-13 02:39:52,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:52,706 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855906123] [2021-11-13 02:39:52,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:52,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:52,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 7385 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:57,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:57,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855906123] [2021-11-13 02:39:57,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855906123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:57,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974351769] [2021-11-13 02:39:57,688 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:39:57,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:57,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:57,689 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:57,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-13 02:39:57,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:57,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 144 conjunts are in the unsatisfiable core [2021-11-13 02:39:57,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:58,406 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 7385 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:58,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:58,924 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 7385 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:39:58,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974351769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:39:58,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1579533619] [2021-11-13 02:39:58,925 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:39:58,925 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:58,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:39:58,925 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:39:58,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:39:58,927 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,927 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:58,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:39:58,928 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:39:58,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:39:58,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:39:58,931 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_146|], 10=[|v_#valid_147|]} [2021-11-13 02:39:58,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:58,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:39:58,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:58,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,937 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:39:58,937 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:58,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:58,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:58,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:58,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:39:58,944 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 23 treesize of output 22 [2021-11-13 02:39:58,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:58,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:39:58,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:39:58,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,948 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:39:58,949 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:39:58,949 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:39:58,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,951 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:39:58,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:39:58,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:39:58,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,983 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:39:58,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:39:58,987 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:39:58,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:39:58,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:39:58,997 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:39:58,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:39:59,001 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:39:59,668 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:39:59,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:39:59,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [143, 143, 143] total 144 [2021-11-13 02:39:59,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996016669] [2021-11-13 02:39:59,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:59,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-13 02:39:59,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:59,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-13 02:39:59,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5344, Invalid=17006, Unknown=0, NotChecked=0, Total=22350 [2021-11-13 02:39:59,671 INFO L87 Difference]: Start difference. First operand 286 states and 287 transitions. Second operand has 145 states, 145 states have (on average 1.9793103448275862) internal successors, (287), 144 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:03,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:03,240 INFO L93 Difference]: Finished difference Result 503 states and 505 transitions. [2021-11-13 02:40:03,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-13 02:40:03,241 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.9793103448275862) internal successors, (287), 144 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 285 [2021-11-13 02:40:03,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:03,241 INFO L225 Difference]: With dead ends: 503 [2021-11-13 02:40:03,241 INFO L226 Difference]: Without dead ends: 287 [2021-11-13 02:40:03,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1067 GetRequests, 848 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8518 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=10598, Invalid=38022, Unknown=0, NotChecked=0, Total=48620 [2021-11-13 02:40:03,243 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 3 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 1185 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 349.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 1191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.27ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 423.77ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:03,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 569 Invalid, 1191 Unknown, 0 Unchecked, 3.27ms Time], IncrementalHoareTripleChecker [6 Valid, 1185 Invalid, 0 Unknown, 0 Unchecked, 423.77ms Time] [2021-11-13 02:40:03,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-13 02:40:03,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2021-11-13 02:40:03,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.006993006993007) internal successors, (288), 286 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:03,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2021-11-13 02:40:03,306 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 285 [2021-11-13 02:40:03,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:03,306 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2021-11-13 02:40:03,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.9793103448275862) internal successors, (287), 144 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:03,306 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2021-11-13 02:40:03,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2021-11-13 02:40:03,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:03,307 INFO L514 BasicCegarLoop]: trace histogram [71, 71, 70, 70, 1, 1, 1, 1] [2021-11-13 02:40:03,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:03,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2624 [2021-11-13 02:40:03,508 INFO L402 AbstractCegarLoop]: === Iteration 142 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:03,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:03,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1534665002, now seen corresponding path program 140 times [2021-11-13 02:40:03,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:03,508 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874471533] [2021-11-13 02:40:03,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:03,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:03,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:05,707 INFO L134 CoverageAnalysis]: Checked inductivity of 9941 backedges. 2485 proven. 7456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:05,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:05,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874471533] [2021-11-13 02:40:05,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874471533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:05,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151595508] [2021-11-13 02:40:05,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:40:05,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:05,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:05,708 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:05,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Waiting until timeout for monitored process [2021-11-13 02:40:06,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 71 check-sat command(s) [2021-11-13 02:40:06,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:06,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 1097 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-13 02:40:06,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:06,754 INFO L134 CoverageAnalysis]: Checked inductivity of 9941 backedges. 2556 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:06,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:07,324 INFO L134 CoverageAnalysis]: Checked inductivity of 9941 backedges. 2556 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:07,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151595508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:07,324 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405903705] [2021-11-13 02:40:07,325 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:07,325 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:07,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:07,325 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:07,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:07,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,327 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:07,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:07,327 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:07,328 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:07,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:07,330 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_147|], 10=[|v_#valid_148|]} [2021-11-13 02:40:07,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:07,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:07,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:07,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:07,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:07,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,337 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:07,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:07,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:07,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:07,343 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 23 treesize of output 22 [2021-11-13 02:40:07,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:07,345 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:07,345 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:07,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,347 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,347 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,348 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:07,348 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:07,348 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:07,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,350 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:40:07,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,364 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:07,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:40:07,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,382 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:07,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:07,388 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:07,389 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:40:07,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:07,399 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:07,400 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:07,403 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:07,870 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:07,870 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:07,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 76 [2021-11-13 02:40:07,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844205962] [2021-11-13 02:40:07,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:07,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-13 02:40:07,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:07,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-13 02:40:07,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2730, Invalid=3912, Unknown=0, NotChecked=0, Total=6642 [2021-11-13 02:40:07,872 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand has 77 states, 77 states have (on average 3.7662337662337664) internal successors, (290), 76 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:09,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:09,925 INFO L93 Difference]: Finished difference Result 298 states and 299 transitions. [2021-11-13 02:40:09,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-11-13 02:40:09,925 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.7662337662337664) internal successors, (290), 76 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 286 [2021-11-13 02:40:09,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:09,926 INFO L225 Difference]: With dead ends: 298 [2021-11-13 02:40:09,926 INFO L226 Difference]: Without dead ends: 296 [2021-11-13 02:40:09,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1073 GetRequests, 918 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6116 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=8281, Invalid=15589, Unknown=0, NotChecked=0, Total=23870 [2021-11-13 02:40:09,928 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 222 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 356.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 1084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.33ms SdHoareTripleChecker+Time, 288 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 432.49ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:09,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [222 Valid, 22 Invalid, 1084 Unknown, 0 Unchecked, 13.33ms Time], IncrementalHoareTripleChecker [288 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 432.49ms Time] [2021-11-13 02:40:09,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-13 02:40:09,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 290. [2021-11-13 02:40:10,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 289 states have (on average 1.0069204152249136) internal successors, (291), 289 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:10,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 291 transitions. [2021-11-13 02:40:10,000 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 291 transitions. Word has length 286 [2021-11-13 02:40:10,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:10,001 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 291 transitions. [2021-11-13 02:40:10,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.7662337662337664) internal successors, (290), 76 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:10,001 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 291 transitions. [2021-11-13 02:40:10,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2021-11-13 02:40:10,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:10,002 INFO L514 BasicCegarLoop]: trace histogram [72, 71, 71, 71, 1, 1, 1, 1] [2021-11-13 02:40:10,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Ended with exit code 0 [2021-11-13 02:40:10,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2643 [2021-11-13 02:40:10,202 INFO L402 AbstractCegarLoop]: === Iteration 143 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:10,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:10,203 INFO L85 PathProgramCache]: Analyzing trace with hash -716971057, now seen corresponding path program 141 times [2021-11-13 02:40:10,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:10,203 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904622412] [2021-11-13 02:40:10,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:10,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:10,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:16,006 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 7597 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:16,006 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:16,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904622412] [2021-11-13 02:40:16,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904622412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:16,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062150107] [2021-11-13 02:40:16,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:40:16,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:16,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:16,007 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:16,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2021-11-13 02:40:16,215 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:40:16,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:16,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 1107 conjuncts, 146 conjunts are in the unsatisfiable core [2021-11-13 02:40:16,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:16,828 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 7597 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:16,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:17,510 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 7597 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:17,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062150107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:17,510 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1427585024] [2021-11-13 02:40:17,512 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:17,512 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:17,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:17,512 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:17,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:17,525 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,526 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:17,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:17,527 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:17,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:17,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:17,531 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_148|], 10=[|v_#valid_149|]} [2021-11-13 02:40:17,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:17,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:17,538 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,539 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:17,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:17,540 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:17,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,542 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:17,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:17,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:17,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:17,550 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 23 treesize of output 22 [2021-11-13 02:40:17,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:17,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:17,552 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:17,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,554 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:17,556 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:17,556 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:17,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:40:17,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,575 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:17,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:40:17,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,598 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:17,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:17,604 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:17,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:40:17,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:17,617 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:17,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:17,622 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:18,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:18,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:18,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [145, 145, 145] total 146 [2021-11-13 02:40:18,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082435517] [2021-11-13 02:40:18,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:18,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2021-11-13 02:40:18,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:18,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-11-13 02:40:18,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5491, Invalid=17461, Unknown=0, NotChecked=0, Total=22952 [2021-11-13 02:40:18,411 INFO L87 Difference]: Start difference. First operand 290 states and 291 transitions. Second operand has 147 states, 147 states have (on average 1.9795918367346939) internal successors, (291), 146 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:23,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:23,094 INFO L93 Difference]: Finished difference Result 510 states and 512 transitions. [2021-11-13 02:40:23,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-11-13 02:40:23,094 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.9795918367346939) internal successors, (291), 146 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 289 [2021-11-13 02:40:23,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:23,095 INFO L225 Difference]: With dead ends: 510 [2021-11-13 02:40:23,095 INFO L226 Difference]: Without dead ends: 291 [2021-11-13 02:40:23,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1082 GetRequests, 860 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8746 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=10891, Invalid=39061, Unknown=0, NotChecked=0, Total=49952 [2021-11-13 02:40:23,098 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 3 mSDsluCounter, 853 mSDsCounter, 0 mSdLazyCounter, 1885 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 590.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 926 SdHoareTripleChecker+Invalid, 1892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.37ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 720.78ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:23,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 926 Invalid, 1892 Unknown, 0 Unchecked, 5.37ms Time], IncrementalHoareTripleChecker [7 Valid, 1885 Invalid, 0 Unknown, 0 Unchecked, 720.78ms Time] [2021-11-13 02:40:23,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-13 02:40:23,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 291. [2021-11-13 02:40:23,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.006896551724138) internal successors, (292), 290 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:23,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 292 transitions. [2021-11-13 02:40:23,178 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 292 transitions. Word has length 289 [2021-11-13 02:40:23,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:23,178 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 292 transitions. [2021-11-13 02:40:23,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.9795918367346939) internal successors, (291), 146 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:23,178 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 292 transitions. [2021-11-13 02:40:23,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-13 02:40:23,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:23,179 INFO L514 BasicCegarLoop]: trace histogram [72, 72, 71, 71, 1, 1, 1, 1] [2021-11-13 02:40:23,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Ended with exit code 0 [2021-11-13 02:40:23,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2662,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:23,380 INFO L402 AbstractCegarLoop]: === Iteration 144 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:23,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:23,380 INFO L85 PathProgramCache]: Analyzing trace with hash -187273082, now seen corresponding path program 142 times [2021-11-13 02:40:23,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:23,380 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922484768] [2021-11-13 02:40:23,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:23,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:23,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:25,937 INFO L134 CoverageAnalysis]: Checked inductivity of 10225 backedges. 2556 proven. 7669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:25,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:25,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922484768] [2021-11-13 02:40:25,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922484768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:25,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017754568] [2021-11-13 02:40:25,938 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:40:25,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:25,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:25,938 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:25,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2021-11-13 02:40:26,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:26,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1112 conjuncts, 147 conjunts are in the unsatisfiable core [2021-11-13 02:40:26,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:26,865 INFO L134 CoverageAnalysis]: Checked inductivity of 10225 backedges. 2628 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:26,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:27,612 INFO L134 CoverageAnalysis]: Checked inductivity of 10225 backedges. 2628 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:27,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017754568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:27,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1070146220] [2021-11-13 02:40:27,614 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:27,614 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:27,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:27,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:27,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:27,616 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,616 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:27,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:27,617 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:27,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:27,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:27,620 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_149|], 10=[|v_#valid_150|]} [2021-11-13 02:40:27,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:27,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:27,626 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:27,627 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:27,627 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:27,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:27,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:27,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:27,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:27,637 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 23 treesize of output 22 [2021-11-13 02:40:27,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:27,639 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:27,640 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:27,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:27,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:27,644 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:27,645 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,646 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:40:27,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,664 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:27,667 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:40:27,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,688 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:27,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:27,693 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:27,694 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:40:27,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:27,706 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:27,707 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:27,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:28,330 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:28,330 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:28,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 77 [2021-11-13 02:40:28,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458939814] [2021-11-13 02:40:28,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:28,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-13 02:40:28,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:28,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-13 02:40:28,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2804, Invalid=4002, Unknown=0, NotChecked=0, Total=6806 [2021-11-13 02:40:28,332 INFO L87 Difference]: Start difference. First operand 291 states and 292 transitions. Second operand has 78 states, 78 states have (on average 3.769230769230769) internal successors, (294), 77 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:30,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:30,493 INFO L93 Difference]: Finished difference Result 302 states and 303 transitions. [2021-11-13 02:40:30,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-11-13 02:40:30,493 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.769230769230769) internal successors, (294), 77 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-13 02:40:30,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:30,494 INFO L225 Difference]: With dead ends: 302 [2021-11-13 02:40:30,494 INFO L226 Difference]: Without dead ends: 300 [2021-11-13 02:40:30,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1088 GetRequests, 931 SyntacticMatches, 2 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6274 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=8505, Invalid=15987, Unknown=0, NotChecked=0, Total=24492 [2021-11-13 02:40:30,496 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 225 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 415.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 1119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.53ms SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 503.59ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:30,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 22 Invalid, 1119 Unknown, 0 Unchecked, 3.53ms Time], IncrementalHoareTripleChecker [292 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 503.59ms Time] [2021-11-13 02:40:30,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-13 02:40:30,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 294. [2021-11-13 02:40:30,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 293 states have (on average 1.006825938566553) internal successors, (295), 293 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:30,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 295 transitions. [2021-11-13 02:40:30,576 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 295 transitions. Word has length 290 [2021-11-13 02:40:30,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:30,577 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 295 transitions. [2021-11-13 02:40:30,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 3.769230769230769) internal successors, (294), 77 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:30,577 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 295 transitions. [2021-11-13 02:40:30,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-13 02:40:30,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:30,578 INFO L514 BasicCegarLoop]: trace histogram [73, 72, 72, 72, 1, 1, 1, 1] [2021-11-13 02:40:30,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:30,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2681,144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:30,778 INFO L402 AbstractCegarLoop]: === Iteration 145 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:30,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:30,778 INFO L85 PathProgramCache]: Analyzing trace with hash 114951923, now seen corresponding path program 143 times [2021-11-13 02:40:30,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:30,779 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541990786] [2021-11-13 02:40:30,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:30,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:30,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:36,109 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 7812 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:36,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:36,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541990786] [2021-11-13 02:40:36,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541990786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:36,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065584525] [2021-11-13 02:40:36,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:40:36,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:36,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:36,110 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:36,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Waiting until timeout for monitored process [2021-11-13 02:40:36,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2021-11-13 02:40:36,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:36,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 1122 conjuncts, 148 conjunts are in the unsatisfiable core [2021-11-13 02:40:36,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:37,325 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 7812 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:37,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:37,979 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 7812 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:37,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065584525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:37,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777451552] [2021-11-13 02:40:37,980 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:37,980 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:37,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:37,980 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:37,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:37,982 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,982 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:37,982 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,983 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:37,983 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:37,983 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,983 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:37,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:37,985 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_150|], 10=[|v_#valid_151|]} [2021-11-13 02:40:37,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:37,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:37,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:37,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:37,992 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:37,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:37,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:37,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:37,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:37,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:38,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:38,002 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 23 treesize of output 22 [2021-11-13 02:40:38,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,003 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:38,004 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:38,004 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:38,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,006 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,006 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:38,007 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:38,007 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:38,008 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:40:38,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:38,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:40:38,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,043 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:38,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:38,047 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:38,048 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:40:38,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:38,058 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:38,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:38,062 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:38,871 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:38,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:38,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [147, 147, 147] total 148 [2021-11-13 02:40:38,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977226931] [2021-11-13 02:40:38,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:38,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2021-11-13 02:40:38,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:38,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2021-11-13 02:40:38,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5640, Invalid=17922, Unknown=0, NotChecked=0, Total=23562 [2021-11-13 02:40:38,876 INFO L87 Difference]: Start difference. First operand 294 states and 295 transitions. Second operand has 149 states, 149 states have (on average 1.9798657718120805) internal successors, (295), 148 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:43,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:43,123 INFO L93 Difference]: Finished difference Result 517 states and 519 transitions. [2021-11-13 02:40:43,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2021-11-13 02:40:43,123 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.9798657718120805) internal successors, (295), 148 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 293 [2021-11-13 02:40:43,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:43,124 INFO L225 Difference]: With dead ends: 517 [2021-11-13 02:40:43,124 INFO L226 Difference]: Without dead ends: 295 [2021-11-13 02:40:43,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1097 GetRequests, 872 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8977 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=11188, Invalid=40114, Unknown=0, NotChecked=0, Total=51302 [2021-11-13 02:40:43,126 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 3 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 1292 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 442.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 1302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.02ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 534.94ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:43,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 622 Invalid, 1302 Unknown, 0 Unchecked, 4.02ms Time], IncrementalHoareTripleChecker [10 Valid, 1292 Invalid, 0 Unknown, 0 Unchecked, 534.94ms Time] [2021-11-13 02:40:43,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-13 02:40:43,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 295. [2021-11-13 02:40:43,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 1.0068027210884354) internal successors, (296), 294 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:43,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2021-11-13 02:40:43,201 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 293 [2021-11-13 02:40:43,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:43,201 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2021-11-13 02:40:43,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.9798657718120805) internal successors, (295), 148 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:43,201 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2021-11-13 02:40:43,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2021-11-13 02:40:43,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:43,203 INFO L514 BasicCegarLoop]: trace histogram [73, 73, 72, 72, 1, 1, 1, 1] [2021-11-13 02:40:43,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:43,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2700 [2021-11-13 02:40:43,404 INFO L402 AbstractCegarLoop]: === Iteration 146 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:43,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:43,405 INFO L85 PathProgramCache]: Analyzing trace with hash -866557910, now seen corresponding path program 144 times [2021-11-13 02:40:43,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:43,405 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621887128] [2021-11-13 02:40:43,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:43,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:43,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:45,742 INFO L134 CoverageAnalysis]: Checked inductivity of 10513 backedges. 2628 proven. 7885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:45,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:45,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621887128] [2021-11-13 02:40:45,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621887128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:45,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617850445] [2021-11-13 02:40:45,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:40:45,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:45,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:45,744 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:45,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2021-11-13 02:40:45,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:40:45,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:45,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 1127 conjuncts, 149 conjunts are in the unsatisfiable core [2021-11-13 02:40:45,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:46,678 INFO L134 CoverageAnalysis]: Checked inductivity of 10513 backedges. 2701 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:46,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 10513 backedges. 2701 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:47,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617850445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:47,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1779082285] [2021-11-13 02:40:47,411 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:47,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:47,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:47,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:47,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:47,413 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,413 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:47,413 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,414 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:47,414 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:47,414 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:47,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:47,417 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_151|], 10=[|v_#valid_152|]} [2021-11-13 02:40:47,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:47,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:47,423 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:47,423 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:47,424 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:47,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,426 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:47,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:47,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:47,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:47,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 02:40:47,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:47,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:47,462 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:47,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,464 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:47,465 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:47,465 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:47,466 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,468 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:40:47,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:47,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:40:47,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,510 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:47,511 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:47,514 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:47,516 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:40:47,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:47,527 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:47,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:47,532 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:48,137 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:48,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:48,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 78 [2021-11-13 02:40:48,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697538591] [2021-11-13 02:40:48,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:48,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-13 02:40:48,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:48,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-13 02:40:48,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2879, Invalid=4093, Unknown=0, NotChecked=0, Total=6972 [2021-11-13 02:40:48,139 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand has 79 states, 79 states have (on average 3.7721518987341773) internal successors, (298), 78 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:50,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:50,377 INFO L93 Difference]: Finished difference Result 306 states and 307 transitions. [2021-11-13 02:40:50,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-11-13 02:40:50,378 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.7721518987341773) internal successors, (298), 78 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 294 [2021-11-13 02:40:50,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:50,378 INFO L225 Difference]: With dead ends: 306 [2021-11-13 02:40:50,378 INFO L226 Difference]: Without dead ends: 304 [2021-11-13 02:40:50,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1103 GetRequests, 944 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6434 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=8732, Invalid=16390, Unknown=0, NotChecked=0, Total=25122 [2021-11-13 02:40:50,380 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 227 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 853 mSolverCounterSat, 297 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 421.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.80ms SdHoareTripleChecker+Time, 297 IncrementalHoareTripleChecker+Valid, 853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 510.86ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:50,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 19 Invalid, 1150 Unknown, 0 Unchecked, 3.80ms Time], IncrementalHoareTripleChecker [297 Valid, 853 Invalid, 0 Unknown, 0 Unchecked, 510.86ms Time] [2021-11-13 02:40:50,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-13 02:40:50,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 298. [2021-11-13 02:40:50,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 1.0067340067340067) internal successors, (299), 297 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:50,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2021-11-13 02:40:50,454 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2021-11-13 02:40:50,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:50,454 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2021-11-13 02:40:50,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.7721518987341773) internal successors, (298), 78 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:40:50,454 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2021-11-13 02:40:50,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2021-11-13 02:40:50,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:50,455 INFO L514 BasicCegarLoop]: trace histogram [74, 73, 73, 73, 1, 1, 1, 1] [2021-11-13 02:40:50,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Ended with exit code 0 [2021-11-13 02:40:50,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2719,146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:50,656 INFO L402 AbstractCegarLoop]: === Iteration 147 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:50,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:50,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1426539727, now seen corresponding path program 145 times [2021-11-13 02:40:50,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:50,657 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631516390] [2021-11-13 02:40:50,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:50,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:50,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:57,095 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 8030 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:57,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:57,096 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631516390] [2021-11-13 02:40:57,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631516390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:57,096 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238172208] [2021-11-13 02:40:57,096 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:40:57,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:57,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:57,097 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:57,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Waiting until timeout for monitored process [2021-11-13 02:40:57,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:57,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 150 conjunts are in the unsatisfiable core [2021-11-13 02:40:57,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:58,023 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 8030 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:58,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:58,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 8030 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:40:58,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238172208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:58,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1476219762] [2021-11-13 02:40:58,697 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:40:58,697 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:58,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:40:58,697 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:40:58,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:40:58,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,699 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:58,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:40:58,700 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:40:58,700 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:40:58,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:40:58,703 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_152|], 10=[|v_#valid_153|]} [2021-11-13 02:40:58,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:58,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:40:58,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,709 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:58,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:40:58,710 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:58,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,712 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:58,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:58,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:58,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:40:58,720 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 23 treesize of output 22 [2021-11-13 02:40:58,721 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:58,722 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:40:58,723 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:40:58,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,725 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,725 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:40:58,726 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:40:58,727 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:40:58,728 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,729 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:40:58,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:40:58,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:40:58,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,768 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:40:58,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:40:58,772 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:40:58,774 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:40:58,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:40:58,785 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:40:58,786 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:40:58,790 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:40:59,589 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:40:59,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:59,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [149, 149, 149] total 150 [2021-11-13 02:40:59,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340424395] [2021-11-13 02:40:59,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:59,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2021-11-13 02:40:59,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:59,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2021-11-13 02:40:59,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5791, Invalid=18389, Unknown=0, NotChecked=0, Total=24180 [2021-11-13 02:40:59,593 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand has 151 states, 151 states have (on average 1.9801324503311257) internal successors, (299), 150 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:04,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:04,349 INFO L93 Difference]: Finished difference Result 524 states and 526 transitions. [2021-11-13 02:41:04,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-11-13 02:41:04,349 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.9801324503311257) internal successors, (299), 150 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 297 [2021-11-13 02:41:04,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:04,350 INFO L225 Difference]: With dead ends: 524 [2021-11-13 02:41:04,350 INFO L226 Difference]: Without dead ends: 299 [2021-11-13 02:41:04,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1112 GetRequests, 884 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9211 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=11489, Invalid=41181, Unknown=0, NotChecked=0, Total=52670 [2021-11-13 02:41:04,353 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 3 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 1317 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 467.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 636 SdHoareTripleChecker+Invalid, 1323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.60ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 568.50ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:04,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 636 Invalid, 1323 Unknown, 0 Unchecked, 4.60ms Time], IncrementalHoareTripleChecker [6 Valid, 1317 Invalid, 0 Unknown, 0 Unchecked, 568.50ms Time] [2021-11-13 02:41:04,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-13 02:41:04,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2021-11-13 02:41:04,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0067114093959733) internal successors, (300), 298 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:04,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2021-11-13 02:41:04,426 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 297 [2021-11-13 02:41:04,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:04,427 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2021-11-13 02:41:04,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.9801324503311257) internal successors, (299), 150 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:04,427 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2021-11-13 02:41:04,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-13 02:41:04,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:04,428 INFO L514 BasicCegarLoop]: trace histogram [74, 74, 73, 73, 1, 1, 1, 1] [2021-11-13 02:41:04,453 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Ended with exit code 0 [2021-11-13 02:41:04,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2738,147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:04,629 INFO L402 AbstractCegarLoop]: === Iteration 148 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:04,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:04,629 INFO L85 PathProgramCache]: Analyzing trace with hash 741943942, now seen corresponding path program 146 times [2021-11-13 02:41:04,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:04,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397373435] [2021-11-13 02:41:04,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:04,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:07,266 INFO L134 CoverageAnalysis]: Checked inductivity of 10805 backedges. 2701 proven. 8104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:07,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:07,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397373435] [2021-11-13 02:41:07,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397373435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:07,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093302157] [2021-11-13 02:41:07,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:41:07,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:07,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:07,268 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:07,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Waiting until timeout for monitored process [2021-11-13 02:41:07,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 74 check-sat command(s) [2021-11-13 02:41:07,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:07,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 1142 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-13 02:41:07,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:08,693 INFO L134 CoverageAnalysis]: Checked inductivity of 10805 backedges. 2775 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:08,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:09,417 INFO L134 CoverageAnalysis]: Checked inductivity of 10805 backedges. 2775 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:09,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093302157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:09,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337234744] [2021-11-13 02:41:09,419 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:41:09,419 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:09,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:41:09,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:41:09,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:41:09,421 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,422 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:09,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:41:09,423 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:09,423 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:41:09,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:41:09,425 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_153|], 10=[|v_#valid_154|]} [2021-11-13 02:41:09,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:09,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:41:09,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:09,432 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,433 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:09,433 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:09,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,435 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:09,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:09,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:09,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:09,445 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 23 treesize of output 22 [2021-11-13 02:41:09,446 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:09,447 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,448 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:09,448 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:09,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,450 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,450 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,451 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:41:09,451 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:41:09,452 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:41:09,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:41:09,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,471 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:09,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:41:09,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,495 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:41:09,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:41:09,500 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:41:09,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:41:09,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:09,513 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:41:09,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:41:09,518 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:41:10,117 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:41:10,117 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:10,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 79 [2021-11-13 02:41:10,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138483070] [2021-11-13 02:41:10,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:10,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-13 02:41:10,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:10,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-13 02:41:10,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2955, Invalid=4185, Unknown=0, NotChecked=0, Total=7140 [2021-11-13 02:41:10,120 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand has 80 states, 80 states have (on average 3.775) internal successors, (302), 79 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:12,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:12,643 INFO L93 Difference]: Finished difference Result 310 states and 311 transitions. [2021-11-13 02:41:12,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-11-13 02:41:12,644 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.775) internal successors, (302), 79 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 298 [2021-11-13 02:41:12,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:12,645 INFO L225 Difference]: With dead ends: 310 [2021-11-13 02:41:12,645 INFO L226 Difference]: Without dead ends: 308 [2021-11-13 02:41:12,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1118 GetRequests, 957 SyntacticMatches, 2 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6596 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=8962, Invalid=16798, Unknown=0, NotChecked=0, Total=25760 [2021-11-13 02:41:12,647 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 233 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 301 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 432.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.84ms SdHoareTripleChecker+Time, 301 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 523.15ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:12,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 17 Invalid, 1036 Unknown, 0 Unchecked, 3.84ms Time], IncrementalHoareTripleChecker [301 Valid, 735 Invalid, 0 Unknown, 0 Unchecked, 523.15ms Time] [2021-11-13 02:41:12,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-13 02:41:12,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 302. [2021-11-13 02:41:12,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 301 states have (on average 1.0066445182724253) internal successors, (303), 301 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:12,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 303 transitions. [2021-11-13 02:41:12,733 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 303 transitions. Word has length 298 [2021-11-13 02:41:12,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:12,733 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 303 transitions. [2021-11-13 02:41:12,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.775) internal successors, (302), 79 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:12,734 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 303 transitions. [2021-11-13 02:41:12,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2021-11-13 02:41:12,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:12,735 INFO L514 BasicCegarLoop]: trace histogram [75, 74, 74, 74, 1, 1, 1, 1] [2021-11-13 02:41:12,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Forceful destruction successful, exit code 0 [2021-11-13 02:41:12,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 148 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2757 [2021-11-13 02:41:12,935 INFO L402 AbstractCegarLoop]: === Iteration 149 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:12,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:12,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1355091187, now seen corresponding path program 147 times [2021-11-13 02:41:12,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:12,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130169251] [2021-11-13 02:41:12,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:12,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:13,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:20,173 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 8251 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:20,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:20,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130169251] [2021-11-13 02:41:20,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130169251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:20,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540840394] [2021-11-13 02:41:20,174 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:41:20,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:20,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:20,175 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:20,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Waiting until timeout for monitored process [2021-11-13 02:41:20,399 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:41:20,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:20,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 1152 conjuncts, 152 conjunts are in the unsatisfiable core [2021-11-13 02:41:20,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:21,139 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 8251 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:21,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:21,865 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 8251 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:21,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540840394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:21,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659850434] [2021-11-13 02:41:21,866 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:41:21,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:21,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:41:21,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:41:21,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:41:21,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,869 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:21,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:41:21,870 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:21,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:41:21,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:41:21,872 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_154|], 10=[|v_#valid_155|]} [2021-11-13 02:41:21,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:21,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:41:21,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:21,879 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,879 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:21,879 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:21,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,881 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:21,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:21,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:21,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:21,889 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 23 treesize of output 22 [2021-11-13 02:41:21,890 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,891 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:21,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:21,892 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:21,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,894 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,895 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:41:21,895 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:41:21,895 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:41:21,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:41:21,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,914 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:21,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:41:21,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,937 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:41:21,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:41:21,943 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:41:21,944 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:41:21,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:21,956 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:41:21,957 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:41:21,962 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:41:22,846 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:41:22,846 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:22,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [151, 151, 151] total 152 [2021-11-13 02:41:22,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766494726] [2021-11-13 02:41:22,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:22,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2021-11-13 02:41:22,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:22,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2021-11-13 02:41:22,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5944, Invalid=18862, Unknown=0, NotChecked=0, Total=24806 [2021-11-13 02:41:22,849 INFO L87 Difference]: Start difference. First operand 302 states and 303 transitions. Second operand has 153 states, 153 states have (on average 1.9803921568627452) internal successors, (303), 152 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:28,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:28,271 INFO L93 Difference]: Finished difference Result 531 states and 533 transitions. [2021-11-13 02:41:28,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-11-13 02:41:28,272 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.9803921568627452) internal successors, (303), 152 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 301 [2021-11-13 02:41:28,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:28,273 INFO L225 Difference]: With dead ends: 531 [2021-11-13 02:41:28,273 INFO L226 Difference]: Without dead ends: 303 [2021-11-13 02:41:28,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1127 GetRequests, 896 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9448 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=11794, Invalid=42262, Unknown=0, NotChecked=0, Total=54056 [2021-11-13 02:41:28,276 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 3 mSDsluCounter, 957 mSDsCounter, 0 mSdLazyCounter, 2104 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 727.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 1033 SdHoareTripleChecker+Invalid, 2110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.53ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 2104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 885.23ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:28,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 1033 Invalid, 2110 Unknown, 0 Unchecked, 6.53ms Time], IncrementalHoareTripleChecker [6 Valid, 2104 Invalid, 0 Unknown, 0 Unchecked, 885.23ms Time] [2021-11-13 02:41:28,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-13 02:41:28,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 303. [2021-11-13 02:41:28,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 1.0066225165562914) internal successors, (304), 302 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:28,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 304 transitions. [2021-11-13 02:41:28,362 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 304 transitions. Word has length 301 [2021-11-13 02:41:28,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:28,362 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 304 transitions. [2021-11-13 02:41:28,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.9803921568627452) internal successors, (303), 152 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:28,363 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 304 transitions. [2021-11-13 02:41:28,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-13 02:41:28,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:28,364 INFO L514 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 1, 1, 1, 1] [2021-11-13 02:41:28,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Forceful destruction successful, exit code 0 [2021-11-13 02:41:28,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2776,149 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:28,565 INFO L402 AbstractCegarLoop]: === Iteration 150 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:28,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:28,565 INFO L85 PathProgramCache]: Analyzing trace with hash -863027414, now seen corresponding path program 148 times [2021-11-13 02:41:28,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:28,565 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145752362] [2021-11-13 02:41:28,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:28,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:28,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 11101 backedges. 2775 proven. 8326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:31,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:31,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145752362] [2021-11-13 02:41:31,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145752362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:31,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416091133] [2021-11-13 02:41:31,237 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:41:31,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:31,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:31,238 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:31,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Waiting until timeout for monitored process [2021-11-13 02:41:31,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:31,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 153 conjunts are in the unsatisfiable core [2021-11-13 02:41:31,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:32,215 INFO L134 CoverageAnalysis]: Checked inductivity of 11101 backedges. 2850 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:32,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 11101 backedges. 2850 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:33,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416091133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:33,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648740710] [2021-11-13 02:41:33,021 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:41:33,021 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:33,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:41:33,021 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:41:33,021 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:41:33,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,023 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:33,024 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:41:33,024 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:33,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:41:33,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:41:33,027 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_155|], 10=[|v_#valid_156|]} [2021-11-13 02:41:33,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:33,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:41:33,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:33,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:33,035 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:33,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:33,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:33,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:33,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:33,045 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 23 treesize of output 22 [2021-11-13 02:41:33,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:33,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:33,047 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:33,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:41:33,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:41:33,051 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:41:33,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:41:33,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,070 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:33,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:41:33,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,092 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:41:33,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:41:33,097 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:41:33,098 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:41:33,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:33,110 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:41:33,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:41:33,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:41:33,736 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:41:33,736 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:33,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 80 [2021-11-13 02:41:33,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480654764] [2021-11-13 02:41:33,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:33,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-13 02:41:33,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:33,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-13 02:41:33,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3032, Invalid=4278, Unknown=0, NotChecked=0, Total=7310 [2021-11-13 02:41:33,738 INFO L87 Difference]: Start difference. First operand 303 states and 304 transitions. Second operand has 81 states, 81 states have (on average 3.7777777777777777) internal successors, (306), 80 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:36,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:36,391 INFO L93 Difference]: Finished difference Result 314 states and 315 transitions. [2021-11-13 02:41:36,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-11-13 02:41:36,392 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.7777777777777777) internal successors, (306), 80 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 302 [2021-11-13 02:41:36,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:36,393 INFO L225 Difference]: With dead ends: 314 [2021-11-13 02:41:36,393 INFO L226 Difference]: Without dead ends: 312 [2021-11-13 02:41:36,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1133 GetRequests, 970 SyntacticMatches, 2 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6760 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=9195, Invalid=17211, Unknown=0, NotChecked=0, Total=26406 [2021-11-13 02:41:36,394 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 235 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 863 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 498.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.25ms SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 863 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 608.29ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:36,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [235 Valid, 26 Invalid, 1167 Unknown, 0 Unchecked, 4.25ms Time], IncrementalHoareTripleChecker [304 Valid, 863 Invalid, 0 Unknown, 0 Unchecked, 608.29ms Time] [2021-11-13 02:41:36,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-13 02:41:36,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 306. [2021-11-13 02:41:36,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 1.0065573770491802) internal successors, (307), 305 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:36,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 307 transitions. [2021-11-13 02:41:36,482 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 307 transitions. Word has length 302 [2021-11-13 02:41:36,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:36,483 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 307 transitions. [2021-11-13 02:41:36,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 3.7777777777777777) internal successors, (306), 80 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:36,483 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 307 transitions. [2021-11-13 02:41:36,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-13 02:41:36,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:36,484 INFO L514 BasicCegarLoop]: trace histogram [76, 75, 75, 75, 1, 1, 1, 1] [2021-11-13 02:41:36,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Ended with exit code 0 [2021-11-13 02:41:36,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 150 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2795 [2021-11-13 02:41:36,688 INFO L402 AbstractCegarLoop]: === Iteration 151 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:36,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:36,689 INFO L85 PathProgramCache]: Analyzing trace with hash -770636337, now seen corresponding path program 149 times [2021-11-13 02:41:36,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:36,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824978190] [2021-11-13 02:41:36,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:36,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:36,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:42,778 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 8475 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:42,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:42,779 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824978190] [2021-11-13 02:41:42,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824978190] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:42,779 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275038513] [2021-11-13 02:41:42,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:41:42,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:42,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:42,780 INFO L229 MonitoredProcess]: Starting monitored process 151 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:42,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Waiting until timeout for monitored process [2021-11-13 02:41:43,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 76 check-sat command(s) [2021-11-13 02:41:43,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:43,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 1167 conjuncts, 154 conjunts are in the unsatisfiable core [2021-11-13 02:41:43,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:43,874 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 8475 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:43,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:44,457 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 8475 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:44,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275038513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:44,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1162182317] [2021-11-13 02:41:44,458 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:41:44,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:44,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:41:44,458 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:41:44,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:41:44,459 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,460 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:44,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:41:44,460 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:44,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:41:44,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:41:44,463 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_156|], 10=[|v_#valid_157|]} [2021-11-13 02:41:44,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:44,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:41:44,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:44,468 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:44,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:44,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,470 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:44,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:44,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:44,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:44,480 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 23 treesize of output 22 [2021-11-13 02:41:44,480 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,481 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:44,481 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:44,482 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:44,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,484 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,485 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:41:44,485 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:41:44,485 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:41:44,486 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,487 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.2 percent of original size 83 [2021-11-13 02:41:44,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,501 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:44,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 222 [2021-11-13 02:41:44,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,519 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:41:44,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:41:44,523 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:41:44,524 INFO L185 QuantifierPusher]: treesize reduction 5, result has 93.4 percent of original size 71 [2021-11-13 02:41:44,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:44,533 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:41:44,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:41:44,537 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:41:45,247 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:41:45,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:45,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [153, 153, 153] total 154 [2021-11-13 02:41:45,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945646107] [2021-11-13 02:41:45,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:45,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2021-11-13 02:41:45,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:45,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2021-11-13 02:41:45,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6099, Invalid=19341, Unknown=0, NotChecked=0, Total=25440 [2021-11-13 02:41:45,250 INFO L87 Difference]: Start difference. First operand 306 states and 307 transitions. Second operand has 155 states, 155 states have (on average 1.9806451612903226) internal successors, (307), 154 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:50,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:50,173 INFO L93 Difference]: Finished difference Result 538 states and 540 transitions. [2021-11-13 02:41:50,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2021-11-13 02:41:50,173 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.9806451612903226) internal successors, (307), 154 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 305 [2021-11-13 02:41:50,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:50,173 INFO L225 Difference]: With dead ends: 538 [2021-11-13 02:41:50,174 INFO L226 Difference]: Without dead ends: 307 [2021-11-13 02:41:50,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1142 GetRequests, 908 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9688 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=12103, Invalid=43357, Unknown=0, NotChecked=0, Total=55460 [2021-11-13 02:41:50,195 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 3 mSDsluCounter, 863 mSDsCounter, 0 mSdLazyCounter, 1922 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 587.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 940 SdHoareTripleChecker+Invalid, 1930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.16ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 739.14ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:50,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 940 Invalid, 1930 Unknown, 0 Unchecked, 5.16ms Time], IncrementalHoareTripleChecker [8 Valid, 1922 Invalid, 0 Unknown, 0 Unchecked, 739.14ms Time] [2021-11-13 02:41:50,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-11-13 02:41:50,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2021-11-13 02:41:50,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.0065359477124183) internal successors, (308), 306 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:50,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2021-11-13 02:41:50,267 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 305 [2021-11-13 02:41:50,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:50,267 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2021-11-13 02:41:50,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 1.9806451612903226) internal successors, (307), 154 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:50,267 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2021-11-13 02:41:50,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-13 02:41:50,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:50,268 INFO L514 BasicCegarLoop]: trace histogram [76, 76, 75, 75, 1, 1, 1, 1] [2021-11-13 02:41:50,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Ended with exit code 0 [2021-11-13 02:41:50,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2814,151 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:50,469 INFO L402 AbstractCegarLoop]: === Iteration 152 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:50,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:50,469 INFO L85 PathProgramCache]: Analyzing trace with hash 477709446, now seen corresponding path program 150 times [2021-11-13 02:41:50,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:50,469 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132701638] [2021-11-13 02:41:50,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:50,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:50,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:53,097 INFO L134 CoverageAnalysis]: Checked inductivity of 11401 backedges. 2850 proven. 8551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:53,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:53,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132701638] [2021-11-13 02:41:53,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132701638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:53,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624531619] [2021-11-13 02:41:53,098 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:41:53,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:53,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:53,099 INFO L229 MonitoredProcess]: Starting monitored process 152 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:53,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Waiting until timeout for monitored process [2021-11-13 02:41:53,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:41:53,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:53,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 1172 conjuncts, 155 conjunts are in the unsatisfiable core [2021-11-13 02:41:53,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:54,179 INFO L134 CoverageAnalysis]: Checked inductivity of 11401 backedges. 2926 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:54,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:54,970 INFO L134 CoverageAnalysis]: Checked inductivity of 11401 backedges. 2926 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:41:54,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624531619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:54,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903714150] [2021-11-13 02:41:54,971 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-13 02:41:54,971 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:54,972 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-13 02:41:54,972 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-13 02:41:54,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-13 02:41:54,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,974 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:54,974 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-13 02:41:54,975 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-13 02:41:54,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-13 02:41:54,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-13 02:41:54,978 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_157|], 10=[|v_#valid_158|]} [2021-11-13 02:41:54,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:54,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 02:41:54,984 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:54,985 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,985 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-13 02:41:54,985 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:54,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:54,987 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:54,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:54,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:54,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-13 02:41:54,995 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 23 treesize of output 22 [2021-11-13 02:41:54,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:54,998 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:54,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-13 02:41:54,998 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-13 02:41:54,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:55,001 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:55,001 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-13 02:41:55,002 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-13 02:41:55,002 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-13 02:41:55,003 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:55,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-13 02:41:55,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 02:41:55,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 224 [2021-11-13 02:41:55,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,043 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-13 02:41:55,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-13 02:41:55,048 INFO L180 QuantifierPusher]: treesize reduction 25, result has 76.0 percent of original size [2021-11-13 02:41:55,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-11-13 02:41:55,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-13 02:41:55,061 INFO L180 QuantifierPusher]: treesize reduction 29, result has 71.6 percent of original size [2021-11-13 02:41:55,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-13 02:41:55,067 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-13 02:41:55,716 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 02:41:55,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:55,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 81 [2021-11-13 02:41:55,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747133959] [2021-11-13 02:41:55,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:55,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-13 02:41:55,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:55,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-13 02:41:55,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3110, Invalid=4372, Unknown=0, NotChecked=0, Total=7482 [2021-11-13 02:41:55,723 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand has 82 states, 82 states have (on average 3.7804878048780486) internal successors, (310), 81 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:58,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:58,353 INFO L93 Difference]: Finished difference Result 318 states and 319 transitions. [2021-11-13 02:41:58,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2021-11-13 02:41:58,354 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.7804878048780486) internal successors, (310), 81 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-13 02:41:58,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:58,355 INFO L225 Difference]: With dead ends: 318 [2021-11-13 02:41:58,355 INFO L226 Difference]: Without dead ends: 316 [2021-11-13 02:41:58,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 983 SyntacticMatches, 2 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6926 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=9431, Invalid=17629, Unknown=0, NotChecked=0, Total=27060 [2021-11-13 02:41:58,358 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 238 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 445.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1066 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.96ms SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 539.39ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:58,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 17 Invalid, 1066 Unknown, 0 Unchecked, 3.96ms Time], IncrementalHoareTripleChecker [309 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 539.39ms Time] [2021-11-13 02:41:58,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-13 02:41:58,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 310. [2021-11-13 02:41:58,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 309 states have (on average 1.006472491909385) internal successors, (311), 309 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:58,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2021-11-13 02:41:58,471 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 306 [2021-11-13 02:41:58,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:58,472 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2021-11-13 02:41:58,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 3.7804878048780486) internal successors, (310), 81 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:41:58,472 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2021-11-13 02:41:58,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-13 02:41:58,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:58,473 INFO L514 BasicCegarLoop]: trace histogram [77, 76, 76, 76, 1, 1, 1, 1] [2021-11-13 02:41:58,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Forceful destruction successful, exit code 0 [2021-11-13 02:41:58,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 152 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0b243053-01a2-4be3-9117-fb9edf90b7aa/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2833 [2021-11-13 02:41:58,674 INFO L402 AbstractCegarLoop]: === Iteration 153 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:58,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:58,674 INFO L85 PathProgramCache]: Analyzing trace with hash -2074692877, now seen corresponding path program 151 times [2021-11-13 02:41:58,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:58,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382526372] [2021-11-13 02:41:58,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:58,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:58,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat